88 Silverado, no start unless primed with fuel.
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- čas přidán 1. 10. 2016
- this is the under hood video for trouble shooting help to diagnose my no start with out a fuel prime problem. this vehicle is a 1988 chev, 2500 Pick up with a 5.7L and TBI. I have replaced the MAP sensor, fuel pump, and fuel pressure regulator. Cleaned the contacts on the fuel pump relay which appears to be operating properly. I also disconnected the battery to reset the computer. SOLUTION WAS, spark module failure. Replaced spark module and it's repaired.
change the modular in the distributor it breaks the fire to the spark plugs like old points use to do and also breaks the fire on and off to make the injectors pump fuel . I have had many of the 4.3s and 350s that had throttle body fuel injection do this and a new modular fixed every one of them. I don't just change the modular but the whole distributor can be bought at auto zone for under 100 bucks with a new modular rotary button and distributor cap . take out number 1 plug have some one turn the motor with a socket and ratchet while you hold you finger in the number 1 spark plug hole. when you feel compression pushing out of the spark plug hole place a crew driver in that hole and feel for the piston to come to the top . when yo feel it start back down turn back the other way till it at the very top this is compression stroke top dead center . then take you distributor cap off and the rotary button will be point at number 1 tower in the cap. loosen the distributor bolt take out the bolt and then distributor and place the new one in just a little behind where the button will be pointing at number one tower as the distributor goes down un the motor in will turn and go towards the number 1 tower in the cap. you mite have to pull it up a little and walk the distributor splines back a little or forward a little till it goes all the way down and ends up pointed at number 1 tower . when its lined up put the bolt back in and tighten it down and it will start and run. if you have fuel pressure and spark the only thing it can be is the modular.
What about if my 98 cranks but has the security light on solid? It will start up and die it get good fuel pressure
Now what if I changed the module and it still isn’t getting fuel?
Im totally confused. What does the spark module have to do with the fuel? Is it the spark module that pressures up the system when you put the key in turn to the on position? On my 88, the schematics show the power running to the computer. I assumed that controlled the pressuring up of the system, before the relay switches on the power. Mine also has the ignition module from a 91. Its mounted near the coil, not on the distributor.
This video just saved me a lot of money... It was the module under the cap. Thank u fer this😀😀
Did u change the whole distributor??
what is this module called?
@@JV-fn5xn ignition control module (ICM)
Ok thanks before you replaced it we're you able to start it?or that it self allowed it to start when you replaced it?
Thanks for this video and the responses. The distributor ICM module was exactly my same problem too. $40 and 10mins and she’s running great!
ICM(ignition control module) it is located underneath rotary button under your distributor cap. I have an 89 GMC Sierra 1500 4x4 4 speed, I was having to ether it or roll it off and dump the clutch. I literally replaced every sensor and a brand new $700.00 TBI ,and nothing worked , the ICM was last thing I replaced, and been fine ever since,if I would’ve changed it first I wouldn’t have needed all the other stuff but hey it probably needed it,just in case anyone wants to know here’s what all was replaced in this order, fuel filter,engine coolant regulator sensor,PCv valve, plugs,wires,cap,button,coil pack,throttle position sensor,throttle body, new injector wire connections,coil pack wiring harness that goes from coil to ICM, and the ICM fixed it
Just for anyone who has this problem.. change the oil pressure sending unit behind the intake, this is the one that tells the fuel pump to prime and run during cranking and starts the fuel pump when cranking to allow it to start normal. the gauge can work and it still be this one.
I have a 88 GMC Sierra K1500 w/5.7L TBI and my engine would start and run with the wire disconnected from the oil sending unit and my dash guage showed I had oil pressure, now explain that one to me. I bought the truck used not long after the previous owner had just replaced the engine with a new crate engine from GM and it had ran excellent for several years after I bought the truck, it wasn't until the fuel pump had gone bad and I replaced the pump but had to prime the TB to get it to start, that's when I began my troubleshooting trying to find the problem, I then plugged the oil sending wire to oil sending unit and nothing changed, but when I replaced the pickup coil in the distributor, that fixed everything.
@@alanwylie8960
that's simple, there are two sending units on them. one is for the gauge and the other is for the ECM to the fuel injection. one is located on the side of the motor and the other is located behind the intake. If i knew how to send pictures in replies I would show you on the motor's I just pulled out to show the two. one from my 95 and the other from my 88. both have two sending units. Now on some Chevy's they did a single with three wires as well and the third wire is the signal wire to the fuel injection, that started in 92 if I remember correctly.
Now for what you are saying you replaced the ignition module in the distributor, that does not control the fuel that controls the coil and spark. So if that's the case that means you were not getting signal to the coil and then the ECM would not fire the injectors as it did not see the signal to do so, that module is the cam and crank signal as well on the TBI so the ECM would not add fuel to a motor that it thinks is not spinning.
These are simple systems with not a lot going on the ECM in these TBI vehicles don't look at anything like what the newer ones do.
Simple tests for diagnostics will tell you what you need.
Thank you guys for the comments. I think this will point me in the right direction to getting my 87 R10 started. It cranks but don't start, the carb catches fire when I try to start it.
@@andycarranza4125 if the carb catches fire when you try to crank it, you might want to double check timing as that is a sign that it is firing on the intake stroke and backfiring through the intake. it might be simple as firing order or just a twist of the distributor to retard more to get it to fire on the compression stroke.
Thank you just bought the truck. I’m restoring it somewhat. I know a little bit about mechanic I like to think but you open my ass always knew it was there, but didn’t know what it was. Lol thank you.
El modulo de ignicion, aumenta la potencia de la corriente (alta tension) y la manda a la bobina de ignicion, y la bobina de ign. La manda al distribuidor a traves de la tapa, y el rotor del dist. La manda a los cables de las bujias.....esta camioneta enciende, cuando le pone gasolina, quiere decir que si hay CHISPA por lo tanto, NO ES EL MODULO DE ENCENDIDO ( REVISA EL ROTOR O LA TAPA) SALUDOS A TODOS,..DESDE MONTERREY N.L. MEXICO
Yo ya le cambie la tapa I el rotulo la bobina tambien pero no el modulo
I no quiere ensender le cambio el modulo
@@hiladiorivera475 Siempre que fue compa?
La mia de repente no prendio. Estarea bien pero no se le escucha la pompa del gas. Y se la puse un poco tiempo pa tras.
I have the same issue with 1990 tbi 2500. fuel pump runs fine. I try cycling the key multiple times, seems a little better if full tank. Pump runs for 20 seconds or so with key on, but won't start unless I prime it. I'm guessing the injectors aren't opening
my truck will run when i prime it with fuel but will die once it burns the fuel i put in there is it the pump? it looks like theres a new fuel pump in it bc the bed is cut and i was told there was by the previous owner but i dont hear the fuel pump prime when i turn the key on either
my 1990 just did this to me. I splashed some gas down it and it fired right up. I thought fuel pump, but I ordered a new distributor thinking it may be the ignition module. Looks like I may be right thanks to your video
replaced fuel pump ,replaced fuel pump relay still not getting gas any advice
Did you ever figure out the problem
@@rubenhernandez5715clogged filter/injectors. check relay fuse, its right next to it. looks like a connector but its just a fuse plug. also fuel pressure regulator on rare occasions
What was the problem because i pour gas and it starts but don’t stay running
Hope this helps someone. I had a similar problem on my 88 Sierra. It would run if you poured fuel into the throttle body but would die soon after. The fuel pump could be heard cycling in prime and run positions(also had poor injector spray pattern, just dripping) . I took off the throttle body fuel delivery line and the pressure seemed quite weak so I assumed it was a weak fuel pump. New pump in hand I pulled the old one and found that the rubber hose between the pump and steel outlet line was badly cracked and had turned into tar. In my case the most of the fuel was pouring back into the tank rather than building pressure. I did change the pump because I already had everything apart. It runs good now considering the fuel pressure regulator leaks like a sieve and it has 10 year old gas in it.
Going through this now
About to go pull my tank. That was my suspicion that it was pump related even though I hear it running. Thanks sir!
i spent bout 1500 chasing my problem on a 93 suburban ....i took all that shit off put a carb on it and no issues goin on 3 yrs the swap was just over a grand doing it myself
My truck is doing the same but battery dies while it turns over. Any guesses?
I have the same problem right now has brand new fuel pump new battery what should I do. I did the same trick what this guy did but no luck
Mine did same things found a broken ground wire on the tps harness.good luck
I just seen this video throttlebody injection is a piece of cake to fix. I used to be a GM mechanic there’s nothing to that system it’s easy to fix very basic. Well it looks like it doesn’t have enough fuel pressure you need 9 to 15 psi fuel pressure or it won’t run. There’s no Schrader valve to check the fuel pressure. Loosen off the return line and start it up if no fuel sprays out of the return line fuel pump is done or the rubber hose from pump to sending unit is split inside gas tank. Also make sure fuel filter not plugged.
Make sure all of your factory grounds have a good connection
How many times have you spent hours/days working on an old vehicle and it ends up being a bad ground? So frustrating for me to do electrical work but it's the best place to start.
Something in the distributor ,pulse generator,,, is going out would be my guess or fuel pump is weak needs 12psi,,, had one that had good fuel and spark with no start issue ended up being something in the distributor ,,, went to local junk yard ,, 25 buck ,,on the road again,,, if you ever have a flooding issue check the little square box to the left top ,, for the wires bare and touching ,,, or bad box,,happen to me,,happen to me in wet conditions acting up
My fuel pump is not turning on at all what could it be?
But mine keep running same carb and all can anyone help me I put the gas in the carb it fires right up but dosent pull fule I've checked the lines and the pump dose it job I'm just lost
What was wrong with it I got the same problem
I have to say. This is the only video about this problem. And i hopefully know the problem now. It's the ignition control module.
Did u get urs fixed. My 4.3 v6 is only starting with starting fluid but runs great after started. Would it still be the icm?
it's the module in the distributor, the start/prime circuit. had the same issue in my 88 and 89 van.
For sure its the module in the distributor
Does that mean replace the distributor? Or can you replace that module alone?
@@marquez1876 Just the module.
@@lordbobrules is there a video out there on how to do that?
@@marquez1876 pretty much the same for v8's too...czcams.com/video/z4hYUMGpFjI/video.html
I have a tbi 88 Chevy 3x3 four door am fuel pump turn on but no fuel goes to tbi I’ve tryed pouring gas on top but can’t get fuel too come up what could I do anyone could help me
Check fuel pump, filter, rely, icm inside distributor
I have a 87 blazer have to prime it an it runs great ever time then if I don’t nothing. I have bought everything for it an I’m lost anyone know something I don’t plz help
Hey im having the same issue with my 87 chevy suburban v20 and itll start if I press the gas pedal but as soon as I let off it cuts off any suggestions I recently did a complete tune up
Any update??
No it's beating the heck outta me
@@sirjaysmooth24 did you find out what was the problem? I'm having the same problem with truck of a friend of mine, when i presd the pedal it will run, when i let it go is just dies
Timing chain
@@sirjaysmooth24 so it ran if you put fuel in the throttle body ...and it was the timing chain ?
I'd have to guess the throttle body is only getting power from the alternator and not the alternator AND battery.
do you have to prime your fuel system after you change your fuel pump??
Yes
Sounds to me as if you're loosing prime check the rubber o ring on the top of your fuel tank between the pump and the tank itself and the rod the fuel pump is connected too Chevrolet is notorious also for the hoses snapping off at the fuel pump housing gl man
Electric pumps prime themselves
My 1988 GMC Sierra at times needed some starter fluid to start but not always and it stayed on. I decided to change the fuel filter to fix this issue, the first 5 times starter right of the bat, very happy to then when I was finally going to drive to not turn on. The pump is buzzing there is spark, and I add starting fluid and it will attemp to start it cranks fires up for a sec but then nothing, does anyone know what happened here?
I have the same exact issue now
Tykhon Koliy I wish you luck, I wasn’t able to figure it out and rather than hiring a mechanic I just sold it.
I will let you know how it goes so far I changed the spark plugs, found one was cross threaded. Still won't start, I ordered the icm and if that doesn't work I'm going to the fuel pump
@@tykhonkoliy8892 did icm fix yours
D?what's your situation I have similar issue but mine started up after a night of sitting but then randomly shut off while driving
Kevin Cayettano it ended up being the spark module in the distributor cap.
Kevin Cayettano auk
Hey guys I have a 92 1500 with a 4.3 in it . And it will not start on its own unless I use starting fluid. But it has a new fuel pump-and filter .. the fuel pressure is at 12 pounds AND the injectors are spraying and pulsating really good !! Once I spray it and it starts it will run for about 1-2 minutes and stall out unless I feather the gas . I’ve replaced everything on it , Fuel pump, fuel filter, module in The distributor, coolant temperature sensor,, and even knowing they wouldn’t help I even replaced the Distributor cap, coil. TPS, maf sensor,And new injectors.. please help me out
Vaccum leak
Sooooooo....what was it?
Fuel pump oil pressure unit
Same problem on my 93 Chevy it looks like one of my injectors that aint spraying enough fuel so ima replace both injectors
Did you ever fix the problem by changing the injectors?
@@THUGBABY2010 well did it
I had the same problem going LS
Same thing mines doing what was the problem??
How did you fixed the ploblem??
It was a bad spark module, the one that is in the distributor. Cost around 20 bucks. Worked great after that.
My 88 S10 got to doing that back in the winter and it was to cold to work on it. I spliced a wire into each wire going to the injector and hung them out of the dash. I can turn the key on and scratch the wires together to prime it and then start it and then it runs fine.
Which wire did you splice on the injectors?
@@derekhardin7486 both of them then scrape them together to prime it. I just have one injector four cylinder. The key has to be on.
Mine is 88 gmc 5.7. Same, or both injectors?
@@derekhardin7486 you will have two injectors if it is throttle body, but will work similar.
que ingenio
👍
I have an issue with no fuel pump running can’t figure it out to save my life
Same issue...about to change fuel pump. I hear nothing when I loosen gas cap. Fuel pump is not turnong on. Replaced relay just in case and nothing. Will keep your fix as backup. Hoping all is well with new pump.
Was it the fuel pump
What's the latest
Did you end up fixing the issue?
@@thatboyjano2406 - was fuel pump. Actually did a second pump after that replacement. Truck wasn't being used often and after a couple years the second pump corroded. They are relatively cheap and not too terrible to change. Just akward to lower tank if it's 1/2 full or more (heavy). Used floor jack with a piece of plywood. Attaching fuel lines and neck is hardest part putting back in place.
i got all the same problems too...i gave up and called summit racing taking all the tbi off
Any updates ?
Hi.. did summit say they have a way to adapt a carburetor in place of the TBI with changing the distributor or manifold?
@@GTguitarworks i swapped the whole thing to carb summit had everything to do it im still running good.....carb intake distributor and fuel regulator some simple wiring thing runs good
NUCLEAR BUM Do you still use the original fuel pump?
@@GTguitarworks yes just need a regulator to bring the pressure down
que es la falla me pasa lo mismo
Well ya got a bad fuel pump . And I couldn't help but notice your squirt bottle was From a fake a drug text kit 🤣😂😂🤣
Best comment to my video yet!
I thought I was trippin🤣
I'm having the same problem with my 1990 gmc Sierra 5.7 tbi what could it be
Jose Panduro I have the same problem , change the fuel pump and nothing .. what was your solution ?
@@rodrigozuniga5908 I changed the coil, fuel pump three times icm twice still nothing!
@ Jose panduro
I've also got a 90 gmc sierra and now my truck is doin what yours is. Did you have any luck finding out the issue?? If so what fixed it?
Come to find out it was a series of a few things . Intake manifold gasket, and bad ecm.
@@davidfink9729 what did the intake gasket have to do with no fuel?
I have been self priming my 90 Chevy 350 Suburban for the past 4 months and can't seem to find the problem. I have the exact same problem.
Will Thompson I replaced the spark module inside the distributor cap and that solved the problem. I understand that a similar condition can be set up if a faulty oil pressure sending unit is sending a signal that caused the computer to think the engine was out of oil.
I replaced mine too. But it is still acting up. My next thoughts were to replace, MAP sensor and EGR. It's really frustrating. I can hear the fuel relay and the fuel pump engaging.
Typical morning, I go out to my truck. I pump the gas about four times. I turn the key and hold it for 5 seconds. Engine turns, no start. Then I turn the key again for 7 seconds. Turns with no start. Then turn the key one last time for another 7 - 9 seconds and she fires. Then every time afterwards I have to put some fuel in the injectors or spray starter fluid in there.
Thank you for making the video.
@@Willtrax did you ever figure this out ?
In my case I had to change the spark module to repair this problem, the one under the distributor cap.
Grant Walker The Coil?
No, the coil was fine, I will see if I can find it online for you.
www.rockauto.com/en/catalog/chevrolet,1988,k2500+pickup,5.7l+350cid+v8,1052211,ignition,ignition+control+module+(icm),7172
@@Kiddro22 www.rockauto.com/en/catalog/chevrolet,1988,k2500+pickup,5.7l+350cid+v8,1052211,ignition,ignition+control+module+(icm),7172
@@Kiddro22 Could also be the pickup coil in the distributor.
Mine did this so i changed the fuel pump relay it ran grate for a wile then back to this
I have a 1990 GMC c1500 ext cab and I was driving it and it went dead so we replaced the fuel pump that didn't work so we replaced the computer and it ran fine but as soon as we drove it it did the same thing any ideas on what the issue is I have power coming from the relay and the fuse but I have no power from the fuel pump but my gauges and everything else works annoy have any ideas on what it could be?
module in dist or oil sending unit
@@bpeters3980 oil sending unit?
i replaced mine still have the same issue. truck won't start only when primed and runs great drive it etc... but once shutoff i can't get it back on without dropping little gas on butterflies... replaced spark module, replaced pump, replaced fuel regulator. anyone out there with expertise please advise. Thank you
Rocky El having the same problem can’t figure it out.did you?
@@Backyardbuilds98
You get er fix bro?
Did you ever fix this problem with your truck ?
Same problem did the same also
Mine 4.3 is doing this anybody figure it out?
So mine Is doing the same I changed icm and nothing
Did you ever get it fixed?
Oil pressure switch
@@retrojay3066 I’m dealing with the same issue, I’m going to replace the oil pressure switch, scanner Danner on here has a good video and he explains that the oil pressure switch can cause this issue
I'm having this same problem. I change Fuel Pump, fuel filter, and fuel pump relay and still nothing. Wondering of anyone has anything else on what it could be? Maybe the fuel pump oil pressure switch?
Jr & Savannah Bishop it could be the fuel pump fuse in the fuse box
Did you find out the problem... My 89 suburban is doing the same
Same with my gmc can't get fuel to the bowl but if I dump gas down it it'll fore right up
@@lexiilucas1419 me to smh
@@jeromekirksey904 i have that issue on my 91 2500. as soon as I open the ignition the fuse blows, I traced the fuel pump wire all the way to the injectors and didnt see an issue. I think I have to check the fuse box itself next? also I think the oil preassure sensor fuse is same as the fuel pump, maybe the wires to that are grounded
I can smell gas
Ok great, why does it do that tho, i can do this all day with my truck too,
ICM didn’t fix my problem
Have this problem in 1990 gmc sierra the only differance is the thing isnt getting fuel but the pump is working
Me too brotha. Exact same prob with exact same truck.
Did you find the fix??
Mine to. Not even the injecters are spraying an my pump an fuel lines are good. I changed the Distributor module twice. An only runs when primed with gas by hand. Idk someone help
@@Qrxas did you get it running?
@@ben4735 yup. It was my actual carb once i changed the whole carb it stayed running
Injectors sprayed then stopped weird! My truck was running at idle then shut off and this has been my problem ever since. 🤔 Finding out what factors will cause the injectors not to work is the challenge. Something told them to stop working maybe something is not in agreement maybe corrosion somewhere 🤷🏾♂️🤷🏾♂️🤷🏾♂️
Check your grounds engine to chassis
Dude its not a ground if you add gas and it starts...means its not getting enough gas
Icm