Diagnosing a misfire
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Uploaded by realfixesrealfast on Jan 5, 2010
Covering the basics of diagnosing a misfire.
- 282 likes, 4 dislikes
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Top Comments
All Comments (132)
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Wow! The needle is not moving during the vacuum test. When I do mine, it doesn't bounce but there is a very slight wiggle around 21. The engine does have 171,000 miles on it with OEM valves.
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I got a 4.2 in my 1994 s420 :D
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@1PossumJenkins vacuum would dip if there was something like an intake valve burnt or not seating. This would bring in pressure, thus causing a drop in vacuum.
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If I suspect an injector I just swap them with another cylinder and see if the problem moves. Quick-n-dirty ;-)
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@masster64 thought of drag in the pulleys or pumps, assuming that it is mechanical problem...
idle between 800 and 900 is a "normal" working condition
better to upload a video up showing the engine running and describing the problem...
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I have a brand new timing chain and valve clearance adjusted according to manual.
anyways, I don't understand what has to do your assumption with my totally RANDOM rough idle...
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@masster64 valve lash adjustment...? something wrong in the timming belt side..?
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WTF!!!! 4.2 L engine... why? its not needed so much volume
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concise video thumbs up
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I'm surprised it had a rock steady vacuum with a dead cylinder. I would have thought the vacuun would dip every time that cylinder should have fired.
What do you all think, people?
1PossumJenkins 10 months ago 9
You're awesome, Duane. Seems like a straight forward diagnosis, yet the other shop couldn't fix it. It would have taken me 3 times as long to figure out it was the injector, but I believe I could have fixed it.
1PossumJenkins 10 months ago 3