I have a 95 Chevy Astro van and it had the exact same identical problem with a brand new fuel pump, watching your video and following the instructions and listening very carefully led me to my problem with my 95 Chevy Astro van and the wiring up front!! You are a true detective of auto mechanics and electronics!!!!!
Spent around £800 on parts including fuel pump , ams sensor , vaccum pump , few relays , over 50 hours of watching youtube videos and around 2 weeks of not having transport to get the same problem sorted , turns out the ecm fuse was blown. Thank you so very much for this video I was a day or two away from scrapping my car
I appreciate that you consider us DIY guys who can't justify a scanner. I do realize sometimes you just need one. Great diagnostics. That was actually fun to watch.
I am SO grateful, that you shared this video!! Was absolutely losing my mind, with this same problem!! Definitely made my wife happy, cause I don't come back from the shop angry as heck anymore! LOL Thanks again for your expertise! 👍🍻
Driving down the road yesterday in my 1994 safari. Turned on the headlights and my car stopped running and wouldn't start. Battery fine, would turn over like it wanted to start but just wouldn't start up. Found this video and immediately checked the 4 pin connection behind my battery. Was a real pain trying to unplug it but when I finally did it had the exact same issue same pin melted. This video was a huge time saver. Thank you it's really appreciated!
I've had to do similar things on older POS vehicles... I suspect you did this, but when comes to cobbling stuff of this sort, I like to at least slather up exposed terminals/connections with silicone dielectric grease. Great videos, Thanks!
Scanner Danner Iam a ase and gm cert mechanic and have been service manager of a gm shop I think the diagnostic steps u have taken were right on par with this repair. This was my first video of urs that I have watched just to see how knowledgeable u r . U clearly have skills and I look foward to watching more videos and possibly learning from u Thx and good job . Keith
Great video, thanks...our Astro van has the same problem, we thought it was the fuel pump, it was not, we changed the ignition module, the relay was melted, and we didn't know about the module behind the battery...we will try tomorrow....we have two weeks with the van trying and my husband found your video, very interesting and useful, hope we can fix the car....regards from Mexico.
Awesome video. You went thru all the steps on checking the fuel pump in a process of elimination that most can follow and do for themselves. Thanks for the method of teaching you used for this application. I would not change what you are doing. So much good information that was given in this video. Thanks
This video saved my but today. I turned the headlights on while driving and boom it died. I thought fuel pump for sure. Now I know how to troubleshoot that. The only thing I didn't like is your comment about not checking the fuse first. That's task one with all electrical. I resolved my problem by removing the wire from the factory plug (cut it off) and attached to the positive on the battery. Runs like a champ now.
Fantastic job ! Very methodical, excellent camera work. I've got the same initial problem (no start, no fuel) on my 1991 Astro, and will go through these procedures now. Thank you very much for explaining everything so well. Much appreciated !
Well - I am surprised - When you did not get power at relay it took you a long time to check fuse - Seems the fuse was the place to start - But you got there and managed a fix - I still learned much - Thanks
At 58 I feel like I’m back in school every time I watch his videos , this particular one I used the same process to trouble shoot a 92 Isuzu 2.6 l Itec that was giving similar symptoms. And when I say back in school I’m referring SD institute . I’m not a tec or mechanic never had any training , in fact a carpenter by trade but as I get older I’m trying to get another skill set that isn’t quite so hard on the body . Thanks for great training videos
Great video. I do prefer using a power probe, personally for a couple of reasons. Mainly because a test light might show that there is no voltage by not lighting up at all but if it does light up it tells you that there is voltage but doesn't tell you how much. Also, I like the power probe because I can send full battery voltage to a load ground to check ground integrity. If the circuit breaker trips in the power probe, the circuit can handle current. The power probe 3 has a display which shows voltage which is great. A test light has it's place and is useful but the power probe offers much more information to me when diagnosing. I feel it makes me more accurate and faster which is always my goal.
the wiring schematic is 4.3L. The engine is 5.7L. I don't have resources to compare the two, but you had a difference you spoke of regarding the number of pins. Time mark was 19:xx I have the same issue, researching my cause.
Wow, this was awesome. I have a 1995 chevy astro van. I am looking at my vehicle when I see this. Same issues for me. I have replaced my electric fuel pump twice. My previous mechanic stopped charging me when I had this issue of cranking but not starting. He would fix it. He also installed a battery switch because my battery kept draining. The wires are so old. Anyway, my new mechanic, the old mechanic's friend, is maybe new to this. He thinks it is the fuel pump. Maybe it is but maybe it is this thing behind the battery. I see it there and I see the other things on the left side. This video really shows me what is happening. Sorry to say I have no background in electrical stuff or I would attempt to fix this thing myself. That area behind the battery sure looks worn. I was planning on selling this back to the county who wants to get these old vehicles off the road. I know this van will run for 300k. It now has 155k. The exhaust it puts out sucks. It is rickety on the freeway and the AC leaks. And the windows don't work. Other than that, it is great. Thanks again for this video. Cool to see how things work in there. Another question I have is: Is there any way to decrease the exhaust on this vehicle? It does put out a lot of pollution.
As long as you're catalytic converter is still good and your fuel trims are normal. That's about all you can do (for exhaust clean-up) but that should also be fine.
I owned a 93 Astro from new until last March. I had the same issue. There are some other common issues that they have that take a bit of time to find but are amazingly simple fixes. That part is not available, I clipped mine from the junkyard.
absolutely wonderful video bro I have watched I have no clue how many videos you are the very best I believe this has also fix the problem on my GMC van I won't know until I test it I have been trying to figure it out for months almost identical to what this vehicle's issues were I can't wait to test would have never thought of looking behind the battery you are a great help and comfort my friend God bless you
Thanks alot for this video. My 92 S10 2.5L had a ground issue from me replacing the Blown OEM speakers with the same size 9x4 and 6x4 4-WAY replacement speakers. According to my friend, he said that the Chevy electrical system keeps a circuit through the speakers even when the key is out of the ignition. My battery would be exhausted within an hour or so of being shut off. Anyways when I got back to the truck and disconnected the speakers, the fuel pump wasn't supplying fuel to the TBI, no matter what. I had seen the pt 261 or 12101870 connector at the back of the motor dangling without a cause. Sure enough following your lead, hooking that up to the to the positive, I struck smelly gold. I know there is a burnt front driver side speaker connector, where it must have shorted. That's the only thing I have spotted as of yet. I hope to find a fuse blown. I am not sure, I left the radio out, and unhooked the speakers. That might be the fuel pump problem for me. I'm going to have to dig deeper. You're video is the only thing on the net that described the PT 261 connector, and what it does. Thanks again.
Paul, maybe you already know this trick, but I would like to share with others. Instead of using the test light, I wet my fingers with water and with one hand I touch the T pin ( violet wire) and with the other hand I am pulsing the battery positive.
Great Video. I had the same issue with my chevy express van and was puzzled also after running through the same tests at first. Finally figured it out because of this video. Thanks.
It always amazes me how other channels they think they know the vehicle but they spend that much time on it and then all of a sudden they have to come back to the wiring diagram if you would start with the wiring diagram and see the components that are there you would say 50% of troubleshooting time right there
Dan here is an update still trying to fix my expy. Expy failed going up hill on short out of town trip. replaced fuel filter that was clogged.. ran perfect for 3 days. It failed after errands in a parking lot.. went to get it.. i drove it home.. for 2 days cranked perfect.. continued to run gas out over the next few days so the fuel pump would be easier to change. It failed to start again for five days. Researched . I have Chilton's ECT. There is a limited amount of info in them. I am an ex electronic tech. Understand relays ECT. So watched videos ECT. Checked Schrader valve had gas there. I decided to turn the engine over.. it started (we are dealing with an intermittent here) I took it to a neighbor and he put a bid tool on it.. not a cheap one.. it initially said misfire on cylinder 4.. that made sense because when it quit, it did misfire going up hills I told him to clear the memory.. He found no codes..no cam sensor problems, no crankshaft sensor problems, always has had the sound of prime, never checked voltage at fuel pump relay or pump itself. I hesitate to pup 12 volts to fuel pump willy nilly, as it may feed back and destroy electronic infrastructure. I know this can be the inertia switch (they sometimes are intermittent). It could be an insulation leak to the chassis. I don't know if I am getting spark.. it seems like like the obd tester would catch that.. The problem is that it is intermittent. I notice this doesn't have the normal spark plug wire setup and I think this is cop setup. I am a little confused how to properly check for spark do I use a noid. Oh yes it is only showing about 30 psi on idle and 35 on acceleration maybe a little higher at high rpms. Also my fuse board under the hood and below the steering wheel does allow pull and replace of relays. If it comes down to it I can fix boards, but if it's a expensive chip.. that probably won't be happening.. I suspect we are dealing with an obvious component. If any body can give me a detailed description of how this all works please do so.
Great video. This was my exact issue. And from the looks of the connector, it happened before to previous owner. So I couldn't find a plug like that yet so I temporarily fixed it. Or you can just replace the power block with one from a truck which what I might do if I can't find a good connector plug. Video was a great help. 👍👍
I was just looking for the fuel pump test lead location to see if I could use the fuel pump to drain fuel from a tank that has held this fuel from back since this video and got caught up watching the whole video. This 94 S10 pickup has a mint body, interior, new tires but threw a rod on #1 cyl. Could not find one of these early vortecs so I took the bottom end from a '99, used the '94 top end and TBI intake. Had to modify the oil pan on the '99 so the slave could bolt on. The '94 came with a metal timing chain cover that took 2 extra mounting bolts then the newer block so I welded them closed. Runs but 4+ year old gas and has to go so I know what I'm burning. Anyway, great diagnostic class vid here. Thanks. Oh, I have a Modis Edge with the 19.4 update. The code it brought up was a 228. OBD 1 has 2 digit codes. Called Snap On, they couldn't say why and said to run it under a Sonoma. Finally got the 2 digit code running as a Jimmy.
Not sure where the fuel pump test connector is on you S10. I think it is under a relay box on one of the inner fenders? I think this video may help as I believe I was jumping it czcams.com/video/09_wQ9yQ85A/video.html&lc=UgyybGui5AtK7FbxhW14AaABAg If not, a good wiring diagram will help you eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=
been a while since I've commented on a video. Thank you for all your work and videos. Its nice to learn and watch as you go into diagnostics on a vehicle. watching this on my 70in tv is pretty entertaining.
Where to get service info (some free, some paid) www.scannerdanner.com/forum/post-your-repair-questions-here/3757-need-service-info-check-here.html I highly recommend the DIY Mitchell one. For $20 you can buy a 30 day pass for individual cars and have access to the same diagrams I use.
Only after watching your videos I came to know that there are fuses for the power relays, so when you had no power on the relay I thought that the immediate next step should be to check if the fuses were ok before moving any further
No it was not a fuse issue. I didn’t express myself correctly. I meant to say that I came to know that relays have fuses only from you. So when I saw that you didn’t have one power feed my next step would be to go and check the fuses
aul was a good case I heard you say that you could not hear the injectors because they are under the intake manifold We use a stethoscope I work at the AA in Holland so often been the fast road where much noise is hope to have made a small contribution
Awesome! I appreciate you guys! My car is 95 Astro which is exactly same model of this video, and it had a same issue which I could figure out it watching this. Thank you!
bro u saved my ass I now know this proccess in diagnosing in an egucated form of open closed current my blaser 92 4x4 had this happen I knew the pump was good but I knew my icm and ditributer were in working order becouse I could start by selfpriming pour gas in the tbi but only ran that gas out but no curent behind I checked fuse only visioly my mistake also were I lost my way u r the master jedi u saved me from pure darkside of scrapping distruction of that pos 4.3 becouseonly other thing I could think it was valvs body thank you u do good work
Why in the infinite wisdom of the modern world would you make circuits where a fault in headlights or CIGARETTE LIGHTER! (?) would disable the computer/fuel pump and the whole damn car?!!! Hell - use two separate batteries/or computers in every car if needed! Why don't we live in a world where the designer figures a sytem where you may not have lights (or a light for a smoke) but at least you wont be stuck on the side of the road?!!! Chasing electrical problems didn't have to be the drag it is car makers - this guy is a competent, trained mechanic but even he has trouble finding out how the main ecm gets power/what is on ecm fuse without a diagram. Should be well labeled at fuses etc.
@@ScannerDanner What if you're on the side of the road? Not dissing you - dissing car companies. Very simple to put a list or easy to follow diagram in owners manual or on fuse panel as to what runs on each fuse for lay people or a roadside repair - and they usually don't. So as a mechanic - do you think it's smart design when a fault in a headlight connector disables the whole vehicle? Same with dome lights/lighter/accessories. There should be a whole other computer and battery operating these that has nothing to do with starting the car. Common sense - and nobody stranded.
That looked like a fairly common GM four-pin connector; I think it should be the same connector they used for the ABS harness in the mid-90s. It's rather large, if I recall? I've seen 'em floating around on the racks at parts stores, though you may have to Dremel it to get the keying to fit. :)
I think you just solved my problem my 95 s10 has been back fireing dying head lights sometimes works and truck runs perfectly when they blink that seems to be when it starts throwing it fits.in which my wife say why do you try to keep driving this. Well it was left to me by dad when he passed away. That why.
Goodness looks like I may have the same problem with my 92 Chevy Astro. I cant hear a click or anything at the fuel pump relay. For a sec I thought I had ran out of gas. When I try to turn it over there is no gas coming from the injectors. I don't have a fuel pressure gauge. And I will try to probe the relay tomorrow as well as the power distribution plug to see if its getting power. Mine was melted to hell too and someone has already worked on it before. The strange part is that it was working just fine before but recently just died at idle and won't really start back up. Guess I'd better check the fuses too.
+ScannerDanner thank you...how can i find the diagram that connect my headlights to fuel pump like in your video that would find my problem...? thnk u again u have me in the right direction
noticed early on in the video the battery wasn't held down, you think this could have been the main cause of that terminal failure with the battery bouncing around right next to it?
A no-prime situation could also be a double-whammy. A fuel pump relay could give out long ago without a person knowing. Some GM engines had a fuel pump switch as a fail safe for the fuel pump relay blowing out. It operates after a few PSI of oil pressure is built up, and the voltage for the fuel pump runs right through it (does not trigger the relay).
+Tim Ramich on those systems the symptom with a bad fuel pump relay is extremely long crank times especially with the engine cold (thick oil takes longer to build psi and close the switch)
Wow... mate, thanks for sharing your knowledge with the community it's incredible the experience that you have.... Well done.... I would like to ask you if would mind you to guide me in a good direction to troubleshoot a fuel priming problem? I have a Toyota Prado 1998 using the 3.4 lts 5VZFE Engine... which is the same used in Tacoma or 4Runner in US from that era 1990-2000, when I turn the key on, the fuel pump does not prime at all but when I cranking the engine suddenly the fuel pump turn ON and the COR relay click and car running ok... Sometimes take me 2 attempt to start the engine, the first) to move the crankshaft and receive the signal from ECM and activated the pump that way and the second) to actually cranking with fuel on the line!.... I have learnt from your videos that the computer has few input in order to communicate with the COR relay, but guessing mine has Alzheimer cause forgot about sending that output signal... which sensor you know are involve in the priming process? I rule out few things EFI is working due I am able to use the car, fuel pump is working too, checked relays and fuse..... Actually I did a test forcing the fuel pump to operate (like the priming action) through the toyota diagnosis port +b and fp with a paper clip, and the fuel pump worked fine then cranked the starter and the car started in the very first attempt!!!! Have you hear something like that? priming action missing.... Well mate excuse my broken english, but you got the main idea hahaha, thanks in advance I do really appreciated any advise!!!!
Thank you and all those involved in the efforts and production of this channel. Merry Christmas, Happy Holidays and Happy New Year to all. May the new year bring you, your families and friends much health, wealth, happiness and peace.
Thank you for cheering this video. I have a 98 Chevrolet Silverado 5.7 vortex crank no start. I install a new fuel pomp, new spark plugs, new ckp sensor, Distribuidor cap n rotor, new injectors, and still don't run. Do the gas pomp suppose to receive power continuously?
Gday Dan....subbed and liked great video... honestly im kind of inexperienced but learning lots from your videos. Im experiencing similar issues.... but its intermittently stalling in the worst of places...(like in the middle of the Bush) I can hear Fuel pump priming....fuel getting to fuel rail....My car has Spark... from there it will crank....but not turn over....Fuel Pump Relay makes a buzzing noise... swapped relays and same result.....tested all fuses and all seem working. Next I thought about Fuel Pressure Regulator..(but I dont have a Fuel Pressure Gauge), Injectors...and coil packs.. However I ruled them out, as the very next day, having done nothing, the car started..... (hence ruling out regulator, injector and coil pack issues) Replacing Fuel Pump as the current one was a bit of an El Cheapo as well as Fuel filter. it may be that its just a cheap dodgy Fuel Pump....but its getting replaced with a FuelMiser one. Hopefully this fixes my problems but if not is it possible that a Bad Earth somewhere is the cause of the 'intermittent stalling'? (all other systems seem to work no issues). Because THAT will be my next step to locating and fixing the issue if it persists. As said im kinda a noob when it comes to electrical though mechanically I have some knowledge. Anyways greta video...love your channel....wish I had a few handy little tools/guages to help me but being short on dollars trying to make do...thanks for all the videos mate From Australia :D
"fuel pump relay makes a buzzing noise" is what I am worried about. This would be caused by a low voltage power supply on the control side (coil side) of the relay or from a bad ground on the same side (control side).
@@ScannerDanner Gday ScannerDanner Thats some pretty good advice to get on my birthday :D Ill use my multimeter today to check the FP relay today as wells Ground Points. Thanks so much for the reply
Good Instructional Video...have worn out fusible links on my 1981 Nissan 200SX...will not be able to find fusible link harness at junk yard so will have to build my own harness to attach to positive side of battery...any suggestions appreciated...
you've inspired me.. This is my plan of attack tomorrow on my truck. usually I think k things out . As you said and put in writing we should have had prime. That's really the key to it all ..I have a f150 expe ,99 with a fuel problem that just turns over.. I did have a bad fuel filter.. I'm not sure what psi it primes it at but it has to be more than nothing. I don't know if my vehicle has a Schrader valve, but I will have a psi tester on it soon. I don't think think there will be anything there .. when we were taught in electronic school that a TV had no video we divided and conquered. it's obvious that there would probably be little or no fuel, but that is a great starting point. next check if pin 85 is getting grounded for a short period of time.. probably is in my case because I hear the pump prime... I should see something back on the gauge. I can take the relay 301 out in my model. I'll troubleshoot from there. I would like to see the cam sensor signal there with a dvom. . Ii already know it gets there, so the computer is doing its job. since I hear the pump try to work I probably don't have a short on that line.. I'll test it anyway for a short.. I know I have continuity because of prime. since I don't need the engine to provide the supply voltage, putting 12 volts on that line will tell the story. just thinking this out . my truck truck was running when it failed..ergo I have a fuel line that is good and flows to the engine. putting a 12 volt supply on it for about four or five seconds.. c.then check my guage will be another divide and conquer place. if the guage stays primed I know that there is nothing wrong with my pump .. if the psi goes down.. the check valve is bad inside the assembly and don't think they are easily repaired.. but just to make sure Ill put relay 301 back in and try to start the vehicle. I have to keep looking at the guage. it would probably be a good idea to monitor the cam shaft signal if it runs.
I have a 95 Chevy Astro van and it had the exact same identical problem with a brand new fuel pump, watching your video and following the instructions and listening very carefully led me to my problem with my 95 Chevy Astro van and the wiring up front!! You are a true detective of auto mechanics and electronics!!!!!
Awesome! Glad it helped you
Ddeds
The very methodical trouble shooting alone was worth watching.. Shows the value of a good schematic and info from the customer.
Thanks so much!
One of the best follow along trouble shooting videos I've seen. Thank you.
Spent around £800 on parts including fuel pump , ams sensor , vaccum pump , few relays , over 50 hours of watching youtube videos and around 2 weeks of not having transport to get the same problem sorted , turns out the ecm fuse was blown.
Thank you so very much for this video I was a day or two away from scrapping my car
I appreciate that you consider us DIY guys who can't justify a scanner. I do realize sometimes you just need one. Great diagnostics. That was actually fun to watch.
+wyattoneable thanks man
This guy has taught me so much on the electrical side of automotive repair
+reweydewy thanks man! It shows a symbol next to your name that says "supported", what does that mean? I've never seen that before?
Thank you.. saved me from changing the fuel pump
I am SO grateful, that you shared this video!! Was absolutely losing my mind, with this same problem!! Definitely made my wife happy, cause I don't come back from the shop angry as heck anymore! LOL Thanks again for your expertise! 👍🍻
Driving down the road yesterday in my 1994 safari. Turned on the headlights and my car stopped running and wouldn't start. Battery fine, would turn over like it wanted to start but just wouldn't start up. Found this video and immediately checked the 4 pin connection behind my battery. Was a real pain trying to unplug it but when I finally did it had the exact same issue same pin melted. This video was a huge time saver. Thank you it's really appreciated!
Awesome! Super glad this helped you
I've had to do similar things on older POS vehicles... I suspect you did this, but when comes to cobbling stuff of this sort, I like to at least slather up exposed terminals/connections with silicone dielectric grease. Great videos, Thanks!
Scanner Danner Iam a ase and gm cert mechanic and have been service manager of a gm shop I think the diagnostic steps u have taken were right on par with this repair. This was my first video of urs that I have watched just to see how knowledgeable u r . U clearly have skills and I look foward to watching more videos and possibly learning from u Thx and good job . Keith
Thanks Keith!
keith frisell hngbgybygv
Great video, thanks...our Astro van has the same problem, we thought it was the fuel pump, it was not, we changed the ignition module, the relay was melted, and we didn't know about the module behind the battery...we will try tomorrow....we have two weeks with the van trying and my husband found your video, very interesting and useful, hope we can fix the car....regards from Mexico.
Awesome video. You went thru all the steps on checking the fuel pump in a process of elimination that most can follow and do for themselves. Thanks for the method of teaching you used for this application. I would not change what you are doing. So much good information that was given in this video. Thanks
Thank you!
This video saved my but today. I turned the headlights on while driving and boom it died. I thought fuel pump for sure. Now I know how to troubleshoot that.
The only thing I didn't like is your comment about not checking the fuse first. That's task one with all electrical.
I resolved my problem by removing the wire from the factory plug (cut it off) and attached to the positive on the battery.
Runs like a champ now.
Fantastic job ! Very methodical, excellent camera work. I've got the same initial problem (no start, no fuel) on my 1991 Astro, and will go through these procedures now. Thank you very much for explaining everything so well. Much appreciated !
Well - I am surprised - When you did not get power at relay it took you a long time to check fuse - Seems the fuse was the place to start - But you got there and managed a fix - I still learned much - Thanks
At 58 I feel like I’m back in school every time I watch his videos , this particular one I used the same process to trouble shoot a 92 Isuzu 2.6 l Itec that was giving similar symptoms. And when I say back in school I’m referring SD institute . I’m not a tec or mechanic never had any training , in fact a carpenter by trade but as I get older I’m trying to get another skill set that isn’t quite so hard on the body . Thanks for great training videos
Thanks for the comment Allen!
Excellent tutorial. This UK Chevy owner is now your No1 fan! Thankyou so much.
Glad to help! Thank you
Great video. I do prefer using a power probe, personally for a couple of reasons. Mainly because a test light might show that there is no voltage by not lighting up at all but if it does light up it tells you that there is voltage but doesn't tell you how much. Also, I like the power probe because I can send full battery voltage to a load ground to check ground integrity. If the circuit breaker trips in the power probe, the circuit can handle current. The power probe 3 has a display which shows voltage which is great. A test light has it's place and is useful but the power probe offers much more information to me when diagnosing. I feel it makes me more accurate and faster which is always my goal.
the wiring schematic is 4.3L. The engine is 5.7L. I don't have resources to compare the two, but you had a difference you spoke of regarding the number of pins. Time mark was 19:xx
I have the same issue, researching my cause.
eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=
This is a diy version of the same service info and diagrams I use. Hope it helps
BTDT, on those Astro vans, did the exact same repair, truly a better repair than replacing that block,common failure on those vans
+Michael Berg thanks Michael!
Exact same problem I'm going through with my 2004 Chevy Colorado right now, so glad someone has the answer!
very informative and gives me hope I can find out why my Vette isn't priming the fuel pump.
What was your solution?
Wow, this was awesome. I have a 1995 chevy astro van. I am looking at my vehicle when I see this. Same issues for me. I have replaced my electric fuel pump twice. My previous mechanic stopped charging me when I had this issue of cranking but not starting. He would fix it. He also installed a battery switch because my battery kept draining. The wires are so old. Anyway, my new mechanic, the old mechanic's friend, is maybe new to this. He thinks it is the fuel pump. Maybe it is but maybe it is this thing behind the battery. I see it there and I see the other things on the left side. This video really shows me what is happening. Sorry to say I have no background in electrical stuff or I would attempt to fix this thing myself. That area behind the battery sure looks worn. I was planning on selling this back to the county who wants to get these old vehicles off the road. I know this van will run for 300k. It now has 155k. The exhaust it puts out sucks. It is rickety on the freeway and the AC leaks. And the windows don't work. Other than that, it is great. Thanks again for this video. Cool to see how things work in there.
Another question I have is: Is there any way to decrease the exhaust on this vehicle? It does put out a lot of pollution.
As long as you're catalytic converter is still good and your fuel trims are normal. That's about all you can do (for exhaust clean-up) but that should also be fine.
Great fix... The best tool to be honest was the Wiring diagram... Without that getting direction will be a little more complicated... You're legend...
I owned a 93 Astro from new until last March. I had the same issue. There are some other common issues that they have that take a bit of time to find but are amazingly simple fixes. That part is not available, I clipped mine from the junkyard.
absolutely wonderful video bro I have watched I have no clue how many videos you are the very best I believe this has also fix the problem on my GMC van I won't know until I test it I have been trying to figure it out for months almost identical to what this vehicle's issues were I can't wait to test would have never thought of looking behind the battery you are a great help and comfort my friend God bless you
Great vid as usual. I really like how you explain the wiring diagram. It makes it much more clearer.
What color is the fuel pump power supply on a 89 buick century
Thanks alot for this video. My 92 S10 2.5L had a ground issue from me replacing the Blown OEM speakers with the same size 9x4 and 6x4 4-WAY replacement speakers. According to my friend, he said that the Chevy electrical system keeps a circuit through the speakers even when the key is out of the ignition. My battery would be exhausted within an hour or so of being shut off. Anyways when I got back to the truck and disconnected the speakers, the fuel pump wasn't supplying fuel to the TBI, no matter what. I had seen the pt 261 or 12101870 connector at the back of the motor dangling without a cause. Sure enough following your lead, hooking that up to the to the positive, I struck smelly gold. I know there is a burnt front driver side speaker connector, where it must have shorted. That's the only thing I have spotted as of yet. I hope to find a fuse blown. I am not sure, I left the radio out, and unhooked the speakers. That might be the fuel pump problem for me. I'm going to have to dig deeper. You're video is the only thing on the net that described the PT 261 connector, and what it does. Thanks again.
Paul, maybe you already know this trick, but I would like to share with others. Instead of using the test light, I wet my fingers with water and with one hand I touch the T pin ( violet wire) and with the other hand I am pulsing the battery positive.
Danner, i don't know how can i thank you for the great knowledge, Skills and Experience you are sharing you
Just by watching like you are!
I just fixed my 94 Chevy Astro Van had the exact SAME ISSUE....You made my day thanks for the video!!!
Great Video. I had the same issue with my chevy express van and was puzzled also after running through the same tests at first. Finally figured it out because of this video. Thanks.
Why do idiots give thumbs down....................
Thanks Paul for a good video using the low tech basic tools approach.
+Andrew W MacFadyen don't know Andrew but thank you!
Right. Great video, gotta be one of the better ones. PS is this ona military transport van if not, awesome paint work haha
I'm Great Auto Electrical Troubleshooter here in Malawi because of your videos big up Paul
Love this, thank you!
It always amazes me how other channels they think they know the vehicle but they spend that much time on it and then all of a sudden they have to come back to the wiring diagram if you would start with the wiring diagram and see the components that are there you would say 50% of troubleshooting time right there
Did I start with the diagram? 😅
your channel is always so good. You have stuff from the do-it-yourself-er to the 30 year veteran great job keep it up
+Kenneth Collins thanks Kenneth
My 08 impala ss having the same issue. I'm stuck but I'll will follow your directions.
having the same issues with my 92 astro. beating my head against the wall! changing one part after another. uncle.
your the man I'm having the same problem with my 95 GMC sierra I will follow what your did to see if that's my problem as well thanks
Dan here is an update still trying to fix my expy. Expy failed going up hill on short out of town trip. replaced fuel filter that was clogged.. ran perfect for 3 days. It failed after errands in a parking lot.. went to get it.. i drove it home.. for 2 days cranked perfect.. continued to run gas out over the next few days so the fuel pump would be easier to change. It failed to start again for five days. Researched . I have Chilton's ECT. There is a limited amount of info in them. I am an ex electronic tech. Understand relays ECT. So watched videos ECT. Checked Schrader valve had gas there. I decided to turn the engine over.. it started (we are dealing with an intermittent here) I took it to a neighbor and he put a bid tool on it.. not a cheap one.. it initially said misfire on cylinder 4.. that made sense because when it quit, it did misfire going up hills I told him to clear the memory.. He found no codes..no cam sensor problems, no crankshaft sensor problems, always has had the sound of prime, never checked voltage at fuel pump relay or pump itself. I hesitate to pup 12 volts to fuel pump willy nilly, as it may feed back and destroy electronic infrastructure. I know this can be the inertia switch (they sometimes are intermittent). It could be an insulation leak to the chassis. I don't know if I am getting spark.. it seems like like the obd tester would catch that.. The problem is that it is intermittent. I notice this doesn't have the normal spark plug wire setup and I think this is cop setup. I am a little confused how to properly check for spark do I use a noid. Oh yes it is only showing about 30 psi on idle and 35 on acceleration maybe a little higher at high rpms. Also my fuse board under the hood and below the steering wheel does allow pull and replace of relays. If it comes down to it I can fix boards, but if it's a expensive chip.. that probably won't be happening.. I suspect we are dealing with an obvious component. If any body can give me a detailed description of how this all works please do so.
Great video. This was my exact issue. And from the looks of the connector, it happened before to previous owner. So I couldn't find a plug like that yet so I temporarily fixed it. Or you can just replace the power block with one from a truck which what I might do if I can't find a good connector plug. Video was a great help. 👍👍
Thank You for the video. Same problem here with 98 pontiac grand prix. Never would have checked the ecm fuse if it wasnt for your video,
Good work!!
I was just looking for the fuel pump test lead location to see if I could use the fuel pump to drain fuel from a tank that has held this fuel from back since this video and got caught up watching the whole video. This 94 S10 pickup has a mint body, interior, new tires but threw a rod on #1 cyl. Could not find one of these early vortecs so I took the bottom end from a '99, used the '94 top end and TBI intake. Had to modify the oil pan on the '99 so the slave could bolt on. The '94 came with a metal timing chain cover that took 2 extra mounting bolts then the newer block so I welded them closed. Runs but 4+ year old gas and has to go so I know what I'm burning.
Anyway, great diagnostic class vid here. Thanks.
Oh, I have a Modis Edge with the 19.4 update. The code it brought up was a 228. OBD 1 has 2 digit codes. Called Snap On, they couldn't say why and said to run it under a Sonoma. Finally got the 2 digit code running as a Jimmy.
Not sure where the fuel pump test connector is on you S10. I think it is under a relay box on one of the inner fenders? I think this video may help as I believe I was jumping it
czcams.com/video/09_wQ9yQ85A/video.html&lc=UgyybGui5AtK7FbxhW14AaABAg
If not, a good wiring diagram will help you
eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=
been a while since I've commented on a video. Thank you for all your work and videos. Its nice to learn and watch as you go into diagnostics on a vehicle. watching this on my 70in tv is pretty entertaining.
+revolutionzerox awesome, thanks man
Great Video. I have a 92 Astro w/same issues. Very complete walk through. easy to follow. Thanks!
Very well done. I have a fuel pump issue, believe it's electrical. I just wish I had better wiring diagrams.
Where to get service info (some free, some paid)
www.scannerdanner.com/forum/post-your-repair-questions-here/3757-need-service-info-check-here.html
I highly recommend the DIY Mitchell one. For $20 you can buy a 30 day pass for individual cars and have access to the same diagrams I use.
Hey thanks for the video bro. I've watched countless vids on my issue and u have so far a good way of explaining step by step.
Only after watching your videos I came to know that there are fuses for the power relays, so when you had no power on the relay I thought that the immediate next step should be to check if the fuses were ok before moving any further
From memory, this wasn't a fuse issue.
No it was not a fuse issue. I didn’t express myself correctly. I meant to say that I came to know that relays have fuses only from you. So when I saw that you didn’t have one power feed my next step would be to go and check the fuses
aul
was a good case
I heard you say that you could not hear the injectors because they are under the intake manifold
We use a stethoscope
I work at the AA in Holland so often been the fast road where much noise is
hope to have made a small contribution
Very good diagnostics to find the problems. Thank you for sharing this video. Grady Tatum.
just one more week to get your book thank you for the videos
+Luis Alonso thanks so much Luis!
BEAUTIFUL PAUL!!!
Now I need to apply your wisdom to my lovely heap 🥰🥶
Leor
Awesome! I appreciate you guys!
My car is 95 Astro which is exactly same model of this video, and it had a same issue which I could figure out it watching this.
Thank you!
Let me know what you find
bro u saved my ass I now know this proccess in diagnosing in an egucated form of open closed current my blaser 92 4x4 had this happen I knew the pump was good but I knew my icm and ditributer were in working order becouse I could start by selfpriming pour gas in the tbi but only ran that gas out but no curent behind I checked fuse only visioly my mistake also were I lost my way u r the master jedi u saved me from pure darkside of scrapping distruction of that pos 4.3 becouseonly other thing I could think it was valvs body thank you u do good work
Thanks brother you taught me some tricks on this project on my s-10 v 6 vortec. Never had one those motors
Antique. The only thing that killed those old Astro Vans was rust. And of course transmissions, and electrical problems.
awesome diagnose . thanks scannerdanner for a wonderful year av trouble shooting .
+Courtney Smith thanks Courtney!
even though half of what you said went in one ear and out of the other (my problem), I learned alot ..thank you
lol, just keep watching me my friend. You will pick up the terminology and methods. Thanks!
Merry Christmas Paul Danner
I learn a lot from watching your video
So far I find your video is the best on CZcams
Love to see more 👍
Why in the infinite wisdom of the modern world would you make circuits where a fault in headlights or CIGARETTE LIGHTER! (?) would disable the computer/fuel pump and the whole damn car?!!! Hell - use two separate batteries/or computers in every car if needed! Why don't we live in a world where the designer figures a sytem where you may not have lights (or a light for a smoke) but at least you wont be stuck on the side of the road?!!! Chasing electrical problems didn't have to be the drag it is car makers - this guy is a competent, trained mechanic but even he has trouble finding out how the main ecm gets power/what is on ecm fuse without a diagram. Should be well labeled at fuses etc.
I won't work on an electrical problem on a car without a diagram.
@@ScannerDanner What if you're on the side of the road? Not dissing you - dissing car companies. Very simple to put a list or easy to follow diagram in owners manual or on fuse panel as to what runs on each fuse for lay people or a roadside repair - and they usually don't. So as a mechanic - do you think it's smart design when a fault in a headlight connector disables the whole vehicle? Same with dome lights/lighter/accessories. There should be a whole other computer and battery operating these that has nothing to do with starting the car. Common sense - and nobody stranded.
I saw your comment, but it is gone. I didn't feel that was directed at me, thank you! I just wanted to clarify what I do
That looked like a fairly common GM four-pin connector; I think it should be the same connector they used for the ABS harness in the mid-90s. It's rather large, if I recall? I've seen 'em floating around on the racks at parts stores, though you may have to Dremel it to get the keying to fit. :)
A great lesson in testing methods 👍
I think you just solved my problem my 95 s10 has been back fireing dying head lights sometimes works and truck runs perfectly when they blink that seems to be when it starts throwing it fits.in which my wife say why do you try to keep driving this. Well it was left to me by dad when he passed away. That why.
I'll help you if this isn't it. Especially since it was left to you by your father
@@ScannerDanner thank you that really means alot to me
Goodness looks like I may have the same problem with my 92 Chevy Astro. I cant hear a click or anything at the fuel pump relay. For a sec I thought I had ran out of gas. When I try to turn it over there is no gas coming from the injectors. I don't have a fuel pressure gauge. And I will try to probe the relay tomorrow as well as the power distribution plug to see if its getting power. Mine was melted to hell too and someone has already worked on it before. The strange part is that it was working just fine before but recently just died at idle and won't really start back up. Guess I'd better check the fuses too.
I had to help my friend exact same problem
Scanner danner you really good 👍
Very good information for my giving situation very helpful !
The old warrior lives to fight another day.
great video...! helps out a lot! i have a 00 chevy silverado doing the same thing just can't find the bad connection on the truck...
+Jason Miller look for areas in the harness near heat and areas that can move
+ScannerDanner thank you...how can i find the diagram that connect my headlights to fuel pump like in your video that would find my problem...? thnk u again u have me in the right direction
Looks like a good fix to me , Better than new
noticed early on in the video the battery wasn't held down, you think this could have been the main cause of that terminal failure with the battery bouncing around right next to it?
A no-prime situation could also be a double-whammy. A fuel pump relay could give out long ago without a person knowing. Some GM engines had a fuel pump switch as a fail safe for the fuel pump relay blowing out. It operates after a few PSI of oil pressure is built up, and the voltage for the fuel pump runs right through it (does not trigger the relay).
+Tim Ramich I always post too soon.
+Tim Ramich on those systems the symptom with a bad fuel pump relay is extremely long crank times especially with the engine cold (thick oil takes longer to build psi and close the switch)
Excellent diag and repair, Paul. You and your Family have a happy holiday.
+wysetech2000 thanks bro.
You are one clever man,learn't alot from you
Wow... mate, thanks for sharing your knowledge with the community it's incredible the experience that you have.... Well done.... I would like to ask you if would mind you to guide me in a good direction to troubleshoot a fuel priming problem? I have a Toyota Prado 1998 using the 3.4 lts 5VZFE Engine... which is the same used in Tacoma or 4Runner in US from that era 1990-2000, when I turn the key on, the fuel pump does not prime at all but when I cranking the engine suddenly the fuel pump turn ON and the COR relay click and car running ok... Sometimes take me 2 attempt to start the engine, the first) to move the crankshaft and receive the signal from ECM and activated the pump that way and the second) to actually cranking with fuel on the line!.... I have learnt from your videos that the computer has few input in order to communicate with the COR relay, but guessing mine has Alzheimer cause forgot about sending that output signal... which sensor you know are involve in the priming process? I rule out few things EFI is working due I am able to use the car, fuel pump is working too, checked relays and fuse..... Actually I did a test forcing the fuel pump to operate (like the priming action) through the toyota diagnosis port +b and fp with a paper clip, and the fuel pump worked fine then cranked the starter and the car started in the very first attempt!!!! Have you hear something like that? priming action missing.... Well mate excuse my broken english, but you got the main idea hahaha, thanks in advance I do really appreciated any advise!!!!
Seen that a lot very common issue
Went to look for a new connector at a junk and mostly found burned ones as well
That's where a forum that specializes in that model is valuable. I use probetalk.com for my Probe.
that one was good I never expected that but over the years I have learned expect the unexpected I'm going to have to try to remember that one
Nice, low tech and all ! As usual nice diagnostic approach and fix ! Paul, Merry Christmas to you and your family !
+Billy R Merry Christmas Billy!
Another great video!! Thank you Master!
this was great , better than mystery theater. CSI SCANNERDAN
Excellent vid. Very good diagnosis.
Great diag and repair, all vehicles should have that feed for the fuel pump lol. hope you have had a good Christmas.
Did anyone else watch the test light and yell at him when the light flickered at 24:24 and he didn't see it???? Yeah me either. You're boss my friend.
Wow ! very interesting. Thank you.
Thank you and all those involved in the efforts and production of this channel.
Merry Christmas, Happy Holidays and Happy New Year to all.
May the new year bring you, your families and friends much health, wealth, happiness and peace.
+patw52pb1 thanks man! I wish it was "those involved", it's just me.
+ScannerDanner Happy holidays and merry christmas to you and your beautiful family Paul !!! :) A hug
+patw52pb1 Happy holidays and merry christmas to you too man :)
Open gas fill,put ear to filler, have someone turn key on.In pump noise heard,pump works.Filter clogged.
Thank you for cheering this video. I have a 98 Chevrolet Silverado 5.7 vortex crank no start. I install a new fuel pomp, new spark plugs, new ckp sensor, Distribuidor cap n rotor, new injectors, and still don't run. Do the gas pomp suppose to receive power continuously?
What are you missing? Spark, fuel psi, injector pulse?
@@ScannerDanner Fuel. Pomp only turn on for 2 secunds N STOPS.
Nice work scanner danner
Gday Dan....subbed and liked great video...
honestly im kind of inexperienced but learning lots from your videos.
Im experiencing similar issues....
but its intermittently stalling in the worst of places...(like in the middle of the Bush)
I can hear Fuel pump priming....fuel getting to fuel rail....My car has Spark...
from there it will crank....but not turn over....Fuel Pump Relay makes a buzzing noise...
swapped relays and same result.....tested all fuses and all seem working.
Next I thought about Fuel Pressure Regulator..(but I dont have a Fuel Pressure Gauge),
Injectors...and coil packs..
However I ruled them out, as the very next day, having done nothing, the car started.....
(hence ruling out regulator, injector and coil pack issues)
Replacing Fuel Pump as the current one was a bit of an El Cheapo as well as Fuel filter.
it may be that its just a cheap dodgy Fuel Pump....but its getting replaced with a FuelMiser one.
Hopefully this fixes my problems but if not is it possible that a Bad Earth somewhere is the
cause of the 'intermittent stalling'? (all other systems seem to work no issues).
Because THAT will be my next step to locating and fixing the issue if it persists.
As said im kinda a noob when it comes to electrical though mechanically I have some knowledge.
Anyways greta video...love your channel....wish I had a few handy little tools/guages to help me
but being short on dollars trying to make do...thanks for all the videos mate
From Australia :D
"fuel pump relay makes a buzzing noise" is what I am worried about. This would be caused by a low voltage power supply on the control side (coil side) of the relay or from a bad ground on the same side (control side).
@@ScannerDanner Gday ScannerDanner
Thats some pretty good advice to get on my birthday :D
Ill use my multimeter today to check the FP relay today as wells Ground Points.
Thanks so much for the reply
u dont want arcs near the batt because the batt lets off flammable/explosive gases ..in case u didnt kno
Good Instructional Video...have worn out fusible links on my 1981 Nissan 200SX...will not be able to find fusible link harness at junk yard so will have to build my own harness to attach to positive side of battery...any suggestions appreciated...
I had an 85 200 sx 😃 your 81 would technically still be a Datsun. Great car!
I have a brand new fuel pump in mine as well could fuel injectors make it not have fuel pressure from the rail
this was a good demonstrationon checking a fuel pump it showed me a lot great job continue the great job Thanks Guy
merry Christmas to you and family Paul. hope it's a belter for you all.
+variablethrust Merry Christmas to you too!
I love your job ,no more neflix for me
PRODIGY Sir ScannerDanner
Good Morning 🙏 🌄
Thank you 👍
PRODIGY Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧
you've inspired me.. This is my plan of attack tomorrow on my truck. usually I think k things out . As you said and put in writing we should have had prime. That's really the key to it all ..I have a f150 expe ,99 with a fuel problem that just turns over.. I did have a bad fuel filter.. I'm not sure what psi it primes it at but it has to be more than nothing. I don't know if my vehicle has a Schrader valve, but I will have a psi tester on it soon. I don't think think there will be anything there .. when we were taught in electronic school that a TV had no video we divided and conquered. it's obvious that there would probably be little or no fuel, but that is a great starting point. next check if pin 85 is getting grounded for a short period of time.. probably is in my case because I hear the pump prime... I should see something back on the gauge. I can take the relay 301 out in my model. I'll troubleshoot from there. I would like to see the cam sensor signal there with a dvom. . Ii already know it gets there, so the computer is doing its job. since I hear the pump try to work I probably don't have a short on that line.. I'll test it anyway for a short.. I know I have continuity because of prime. since I don't need the engine to provide the supply voltage, putting 12 volts on that line will tell the story. just thinking this out . my truck truck was running when it failed..ergo I have a fuel line that is good and flows to the engine. putting a 12 volt supply on it for about four or five seconds.. c.then check my guage will be another divide and conquer place. if the guage stays primed I know that there is nothing wrong with my pump .. if the psi goes down.. the check valve is bad inside the assembly and don't think they are easily repaired.. but just to make sure Ill put relay 301 back in and try to start the vehicle. I have to keep looking at the guage. it would probably be a good idea to monitor the cam shaft signal if it runs.
Merry Christmas to you and your family Paul. Loved all your videos this year.
+Matt W Merry Christmas to you to Matt!
thank you you are the best you helped me so much