Engine Misfire Diagnoses, Cylinder Leak Down Test Required
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- เผยแพร่เมื่อ 14 ธ.ค. 2022
- Diagnosing a misfire that requires a cylinder leak down test to find the misfire. How to check relative compression with or without a lab scope. GM 3.6l engine misfire diagnostic.
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Automotive technician - ยานยนต์และพาหนะ
This channel is a hidden gem.
Excellent diagnosis of migrating gasket failure.
I can believe this channel doesn't have 10 million subscribers
Maaan thank you
This channel is pure gold. Way underrated.
Thanks! Wish I had more time for more videos.
@CrazedPerformanceRepair this is top notch diagnosis and the kind of knowledge that can only be acquired through direct experience and critical thinking yet you are conveying it clearly via video. Excellent job. I'm still snoozing on getting these broken manifold bolts outta my wife's truck though lol.
@@kentdavies1988 break out the welder like I did in my video a while back. It works wonders.
Subscribed, going through this same issue with a four cylinder. 2006 tsx. Leak down test is next on my list. Compression good, new injectors, new plugs, new coils, coils and injectors get power so yea next is leak down test
Face mill. Great video. Looking forward to the next installment.
Great stuff 👍 thanks for sharing. ✌ GOD bless America 🇺🇲
Nice explanation!
Had a 5.3 silverado with a misfire and a ltft imbalance. Fuel was being pulled, but no code, just misfire. Buddy thought is was coil, vac leak. Misfire went away when I swapped a take off injector I had. Ltft kept removing fuel and started throwing code. I swapped his aftermarket maf sensor for oem. It was strange because the maf g/s was only off by maybe 5% or so.
I thought the whole point of precision machining was...umm... precision. I know there are hollow ground chisels and plane blades (so you can sharpen them faster). But hollow ground heads and decks. That's wild.
Once I actually got it apart it turned out to be multiple badly leaking exhaust valves transfering air to each other from a really bad OEM valve job. Also had small gasket leak too. Valves seats where so bad I was concerned I wouldn't be able to fix it without replacing the seats. Did have to replace some valves though.
How about checking across head (and perhaps lengthwise too) with straight edge and feeler guage prior to maching head? ( It would be intrresting to know the depth of the concave).
Are you going to check the block for flatness too?
J
P0300 code on my 3.8 Eclipse.
New coils, plugs, maf ,map, injectors, fuel gauge...Checked crankangle sensor & cam sensor.
It just stalls and dies at idle, randomly.
Chemical tested for head gasket leak, no exhaust gas found in coolant. Thinking I have bad lifters as I have a wicked rattling noise that comes and goes, maybe causing a misfire.
Have you cleaned the throttle body, mass air flow, and checked PCV valve? I had the same issue and this solved it.
@@ChristianRachford-zl5tq finally smoke tested the engine...
I had a massive leak on the power brake booster line.
Help please!
If you find that your bolts were all very loose, not even finger tight. is there a chance that you can tighten them back? Would that pressurize the engine and unstick the lifter? Replaced sending unit &screen , helped but not the noise- after watching your videos I checked the bolts and they weren’t even finger tight.
A few things happened that I feel caused this.
Ran out of gas- I know- it was very stupid but I was in a hurry and well.. that will teach me!
Bought a gas can- btw I was holding up highway traffic so let’s say I was panicking-
Tried starting without enough gas in it.
I was finally able to unstick faulty can
Got enough gas to make it to the gas station, everything was fine, ran great like always-
got back on the highway 5 miles down the road, the truck starts shaking- I immediately get off and pulled over. Sounds horrible but drives fine, drive it 10min to my house but then starts shifting hard- only in 2nd gear. Just curious if I could have multiple issues because of gas and if not pressurizing cause of manifold plate/ vlom.
I have a misfire p0301 and a reactivation control performance code p1411 on my gen 3 5.7 hemi. Im guessing the solenoid for the MDS system is stuck. Last oil change I used mobil 1 full synthetic high mileage for the first time instead of the non high mileage which is the manufacturer recommened oil. Im now curious if possibly the high mileage oil gummed up the solenoid. What do you think of the additives in the high mileage oil does it cause sludge? let me know. I'm thinking of trying a partial ATF flush as it is due for an oil change now. I was going to just add a quart of ATF run it for 15 minutes and drain it and refill with fresh oil and see how it behaves. If it doesnt resolve the misfire I'll have to pull the intake and replace the solenoids I figure i may as well do them all while I'm in there.
My engine only shakes after warming up. Can someone tell me what it might be? I know there are some smart people here. The vehicle barley moves when pressing the gas, smoke or steam coming out of the exhaust pipe, etc. The water pump went bad and I replaced it. I think I had a blown head gasket. I used gasket sealer and the smoke reduced almost completely but when I first turn the vehicle on a puff of smoke comes out. No check engine light. The temperature guage does not go up enough when my scan tool shows a much higher temperature. The engine is knocking. When I remove the upstream oxygen sensors I hear something like clunking or air quickly releasing from the exhaust valve when it shouldn't, on the side that shakes the most. I would really appreciate advice, suggestions, etc. Thank you.
Hi I have a 1995 Subaru Impreza N/A with 1.8L ej18 4 cylinder boxer. I had weak power going uphill and faster than 60mph. Took it to a suggested shop. They test drove it and did dry compression test for $120 and 3 days of my time. I'm not impressed. #2 and #4 cylinders both read about 77 psi dry. They said "bad head gasket" but didnt give helpful tests to show that. I don't have any overheating or fluid losses. I want to be sure.
Can a mechanic or myself confirm my valve timing is correct on that one side without doing more than spark plug removal and part of the timing cover? Is it possible for SOHC to have one head mis-timed?
It's only really possible if someone installed a belt wrong. For it to jump on its own without more issues isn't likely. Head gaskets are really common on those though.
Wouldnt you have to overheat the motor to warp the head to that extreme?
No, this was never overheated. I found out is was more than just a head gasket issue. As explained at end it was also cut bad from factory.
Got it. I was thinking your explanation of the warped head was from maybe a previous rebuild or head surface job. Bad machining from the factory shouldn't happen in his day and age.....lol!