A6 2.7t Random missfire in needs of advice and help
#1
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A6 2.7t Random missfire in needs of advice and help
Hey i got a 2004 a6 2.7t and i got random missfire on all cylinders. I been chasing this for over a year now. I just recently in the past month i changed all spark plugs ngk, brand new oem coils, new 02 sensors, and new maf sensor. I have been searching for a possible boost leak or vacuum leak for months but no luck. Any ideas on what to search for or what to teat/try next. Also my engine is a 04 BEL engine so you can rule out the icms. Also my car is chipped stage one so the rear 02s or deleted only the fronts where changed out. I cant seem to find the cars disease for random missfire.
Last edited by Dakiddc973; 05-05-2015 at 08:30 PM.
#3
i got random missfire on all cylinders
From past experience on different engine platforms, usually when all cylinders miss fire its a failing crank sensor.
#4
Don't know if this applies to your model year, but I thought I share it...
https://www.audiworld.com/forums/2-7...p0300-2846545/
Good Luck!
https://www.audiworld.com/forums/2-7...p0300-2846545/
Good Luck!
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#8
I've got a 02 a6 with the 2.7t that I've chased this for awhile now too... I did the 2.0 conversion and everything was fine for about six months and then when I got on it hard it would misfire but wouldn't set a code. Popping out the exhaust. well I could change the plugs and it would go away for a week or so... I noticed brown "etching" down the side of one or two of my plugs and wrote it off deciding to change the plugs AGAIN. Well it started missing almost immediately and I rewired all of my conversion again soldering all the joints this time. I figured for sure this would get it fixed... NOPE. Well I bought 2 cards of dielectric grease and greased the connectors and the boots where they plug into the plugs... Guess what? $2.75 fixed my problem. The coils were arcing down the body of the plug and sparking to the sidewall of the plug well! Try it it might work for you
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