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A6 2.7t Random missfire in needs of advice and help

A6 2.7t Random missfire in needs of advice and help

 
Old 05-05-2015, 07:41 PM
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Default 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.

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Old 05-06-2015, 07:06 AM
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Does anyone have any sugestions???
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Old 05-18-2015, 05:40 AM
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i got random missfire on all cylinders
How do you know its a miss fire on all cylinders? Is there a specific code that its throwing?

From past experience on different engine platforms, usually when all cylinders miss fire its a failing crank sensor.
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Old 06-19-2015, 11:26 AM
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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!
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Old 06-22-2015, 11:06 AM
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I have random missfire for all cylinders. Also cel always blinking if car is idling long. And has rought idle as well as hesitates once in the blue.
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Old 06-23-2015, 09:22 PM
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maybe, you need to replace ICM. In my case that works after change my ICM
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Old 06-29-2015, 06:53 PM
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Originally Posted by cjtcolor View Post
maybe, you need to replace ICM. In my case that works after change my ICM
Its a 04 BEL engine no icms
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Old 07-06-2015, 10:11 PM
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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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