You don’t have to rush. Most of us aren’t turned away by a lengthy video. Rant away and take all of the time you want. Those of us in the field enjoy watching long drawn out videos. Diag from beginning to end lol
Great to see you get to the actual root of the problem without playing with the customers money 👍👍 I had one that showed a similar waveform and it confused me for a minute because it was the same type of set up with timing so there was no way that it could have been related to timing issue, it turned out the customer had mixed up the plug wire arrangement and was causing the engine to "fight itself" during cranking, simple swap around of plug wires fixed mine. Thank you for sharing and rant all you want, we might a learn a thing or two withing that also lol
I'm glad that you mentioned to have a wide open throttle during the relative compression test. You wouldn't believe how many people that don't do that.
Even though I don't work on newer vehicles (OBD I and older for me), I still like watching videos like this because they help me learn and I can sometimes even explain things that shops tell people about their own modern vehicles.
Great video! Love the shameless plug for L1- Training. Keep the videos and information coming, thanks for helping grow the next Gen techs and improving us old dogs
I could hear it the first time you turned the engine over there was deffiantly something wrong with that engine mechanically Loved the way you did ac coupling on the voltage at the battery for the relative compression test another tool to add to my box
It’s funny you mention the starter can affect the waveform because Chrysler is the one I’ve seen the worst of. I’ve seen some janky cranking current from starters on Chryslers and it seems like it’s mainly on the 3.6l engines.
a friend has one just a year or two newer v6 was a no crank no start. got it back now it has stalling surging problems. shop said the immobilizer went bad and also took out ecm. its like wait. what??? now has an oil guage goofing up too. i think theres more going on here but i'm not stepping into this pile of poo
Remember when they found the ship in the middle of the desert in ‘Close Encounters of the Third Kind’? This is today’s version, but they dropped the Jeep into a lake first because the spaceman mechanic saw the Jeep emblem.
Still like how Eric explains things ,sorry ,and if it is the crank position sensor,simply how did you find that please ? Do sensors have a test that can ve done on a cheap ohms meter ? Most people who have any knowledge will go for the Spark ,fuel compression thing first and once thats established,would liok at CPS
Low compression, it was not galloping that bad, would still start. It’s probably not starting due to ECM - PCM comm issues. The charting of the started output confirmed nothing IMO
@@L1Training That WJ is nearly identical to my daily driver, but in rougher shape. I wonder if the engine overheated due to a faulty solid-state cooling fan relay. It's a pretty common problem on these, but fortunately the fan shroud will also accommodate a regular clutch fan. My fan and clutch is off of a GM S-Series truck with the 4.3l engine. It threads right on the the water pump snout on these 4.0l engines. No more electric fan to worry about, and it's been an awesome vehicle for me. Great video, by the way!
How would you have approached it if you didnt have a pcm laying around? Would you have jumped the starter and confirmed good sounding conpression on all 6 cylinders before calling the customer and telling them it needs a pcm first before going further into diag?
A quick google search shows the firing order is 1-5-3-6-2-4. If you consider cylinders 1-3 as the front half, and 4-6 as the back half of the in-line engine, the firing order goes front-back-front-back-front-back. So what could make every other cylinder (in the firing order) have low compression? It would appear to be either the front or rear 3 cylinders. A twisted or broken crankshaft between cylinders 3 and 4? Perhaps the camshaft is twisted or broken? I'm racking my brain trying to figure out the cause of the odd relative compression waveform. The exhaust manifold splits into two banks, IIRC. Perhaps one of the exhaust manifold banks is clogged. What was the cause?!! lol. Not looking for a silver bullet but all things I'm thinking it could be are crazy situations.
Going deeper down the hole here --it can't be a broken crankshaft. The starter motor spins the flywheel, and if the crank was broken, the front crank sprocket wouldn't spin the camshaft, and no cylinders would have compression. The crank could be twisted though, if that's ever happened before. Perhaps the crank is fine and the camshaft is the issue. That would place the front 3 cylinders as good and the back 3 as bad. Very interesting to think about.
I agree, while it could likely come down to a bad motor I think I'd see if the customer would pay for more testing. It could have fuel washed 3 of the cylinders due to a ckp or distributor issue. And exhaust restriction on one manifold would cause the speed density system to dump fuel and flood some cylinders. Wouldn't add much time to just go in cylinder with a pressure transducer on a couple
It’s okay Autozone will give a free diagnosis!😂
You don’t have to rush. Most of us aren’t turned away by a lengthy video. Rant away and take all of the time you want. Those of us in the field enjoy watching long drawn out videos. Diag from beginning to end lol
Great to see you get to the actual root of the problem without playing with the customers money 👍👍 I had one that showed a similar waveform and it confused me for a minute because it was the same type of set up with timing so there was no way that it could have been related to timing issue, it turned out the customer had mixed up the plug wire arrangement and was causing the engine to "fight itself" during cranking, simple swap around of plug wires fixed mine. Thank you for sharing and rant all you want, we might a learn a thing or two withing that also lol
If vehicles were not so loaded with processors, that would have been an easy diagnosis back in the 70's - 80's
I like the longer video...I'm only a DIYer that learns a lot from these.
I'm glad that you mentioned to have a wide open throttle during the relative compression test. You wouldn't believe how many people that don't do that.
Great video sir .
Thank you sir I don’t care how long the video takes , as long as I’m learning Wich is my case .
I appreciate you sir
Even though I don't work on newer vehicles (OBD I and older for me), I still like watching videos like this because they help me learn and I can sometimes even explain things that shops tell people about their own modern vehicles.
Great video! Love the shameless plug for L1- Training. Keep the videos and information coming, thanks for helping grow the next Gen techs and improving us old dogs
I'm happy ANYTIME I learn something new!
I've just subscribed to trained by techs and voltage drop diagnostic.....I told them you sent me
I could hear it the first time you turned the engine over there was deffiantly something wrong with that engine mechanically
Loved the way you did ac coupling on the voltage at the battery for the relative compression test another tool to add to my box
Great video. I heard the engine when you first started it. I might would do the repairs if it was mine and in better shape.
Love your content look forward to the next one!
I love any video you share with us
Thank you my friend , you are outstanding
I like the longer educational videos. Keep it up!
Appreciated your video,truly added knowledge in my part.👍
I love the rants
It’s funny you mention the starter can affect the waveform because Chrysler is the one I’ve seen the worst of. I’ve seen some janky cranking current from starters on Chryslers and it seems like it’s mainly on the 3.6l engines.
Love it! All I can say is that we think a lot alike. Pico is my best friend.
Great video!
Loved every minute of the video! 👌🏽
a friend has one just a year or two newer v6 was a no crank no start. got it back now it has stalling surging problems. shop said the immobilizer went bad and also took out ecm. its like wait. what??? now has an oil guage goofing up too. i think theres more going on here but i'm not stepping into this pile of poo
As soon as I heard it crank I knew low compression on at least 2 or 3 cyls.
Silver bullets are for werewolves. Ramble on brother! I like to learn! 👍🏼
Remember when they found the ship in the middle of the desert in ‘Close Encounters of the Third Kind’? This is today’s version, but they dropped the Jeep into a lake first because the spaceman mechanic saw the Jeep emblem.
As soon as I heard that cadence, I said “uh oh “!
Still like how Eric explains things ,sorry ,and if it is the crank position sensor,simply how did you find that please ?
Do sensors have a test that can ve done on a cheap ohms meter ?
Most people who have any knowledge will go for the Spark ,fuel compression thing first and once thats established,would liok at CPS
Testing and analysis found it, resistance is not a good test, it can have good resistance and still be failed.
Great video, Thanks!
Good video
Like you, soon as i heard the cranking cadence, i heard no compression.....
great video. thanks.
Thanks for sharing keep the videos coming Keith 😊
Do it this way....rant and educate as much as you can!!!!!
If it’s been sitting along time could it be the lifters aren’t pumped up
if you added a 2nd channel to id firing order woud you get signal from spark with no crankshaft signal
Probably not
Low compression, it was not galloping that bad, would still start. It’s probably not starting due to ECM - PCM comm issues. The charting of the started output confirmed nothing IMO
Had blown headgasket, I addressed the PCM concern in the video.
@@L1Training That WJ is nearly identical to my daily driver, but in rougher shape. I wonder if the engine overheated due to a faulty solid-state cooling fan relay. It's a pretty common problem on these, but fortunately the fan shroud will also accommodate a regular clutch fan. My fan and clutch is off of a GM S-Series truck with the 4.3l engine. It threads right on the the water pump snout on these 4.0l engines. No more electric fan to worry about, and it's been an awesome vehicle for me. Great video, by the way!
How would you have approached it if you didnt have a pcm laying around? Would you have jumped the starter and confirmed good sounding conpression on all 6 cylinders before calling the customer and telling them it needs a pcm first before going further into diag?
Unfortunately we would have diagnosed and repaired the PCM issue then found the engine was failed.
A quick google search shows the firing order is 1-5-3-6-2-4. If you consider cylinders 1-3 as the front half, and 4-6 as the back half of the in-line engine, the firing order goes front-back-front-back-front-back. So what could make every other cylinder (in the firing order) have low compression? It would appear to be either the front or rear 3 cylinders. A twisted or broken crankshaft between cylinders 3 and 4? Perhaps the camshaft is twisted or broken? I'm racking my brain trying to figure out the cause of the odd relative compression waveform. The exhaust manifold splits into two banks, IIRC. Perhaps one of the exhaust manifold banks is clogged. What was the cause?!! lol. Not looking for a silver bullet but all things I'm thinking it could be are crazy situations.
Going deeper down the hole here --it can't be a broken crankshaft. The starter motor spins the flywheel, and if the crank was broken, the front crank sprocket wouldn't spin the camshaft, and no cylinders would have compression. The crank could be twisted though, if that's ever happened before. Perhaps the crank is fine and the camshaft is the issue. That would place the front 3 cylinders as good and the back 3 as bad. Very interesting to think about.
I agree, while it could likely come down to a bad motor I think I'd see if the customer would pay for more testing. It could have fuel washed 3 of the cylinders due to a ckp or distributor issue. And exhaust restriction on one manifold would cause the speed density system to dump fuel and flood some cylinders. Wouldn't add much time to just go in cylinder with a pressure transducer on a couple
Hi can you clone a Nissan Nv 200 Nissan Ecu that has already bin used to a other van thanks
Wait did you just tell yourself to Wrap it Up? Hilarious
Since the crank sensor isn’t working and no spark. Is there another way to check which cylinders are low compression?
Absolutely, I could use an incylinder transducer and then plug in the firing order.
👍👍
my money it got cooked
👍 what a mess!
I don't want silver bullets either.
👍
CANNY L1 Automotive Training
From London England UK 🇬🇧 ⏰️ 16:56
I really wish I could thumbs down this. 😂 jk. Man such a good test. So quick and easy
Not bad for an ex-cop ...
740- I'm going g with broken timing chain. Rpm .ight not show if the cam isn't moving g because cam/ crank work together.