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View Full Version : 02 A6 3.0 cold start misfire.



jackmup
19-05-2009, 05:53 PM
I was wondering if anyone has resolved this issue. there is another thread posted from 2008 with two new members posting my exact same problem but they didn't post a resolution.
http://www.vwaudiforum.co.uk/forum/showthread.php?t=31075&highlight=cold+start

My coils, plugs, vacuum lines are all new.
I cleaned and tested the injectors, they're good
timing belt is new, No oil leaks at all.
No oil leaking down spark plug hole. Valve cover gaskets new.
I am going to test the wires to cylinder 4 again, maybe they arc in the morning due to humidity.

This only happens in the morning, sometimes/intermitent and lasts for 20 seconds. Cylinder 4 misfires, P0300,P0304 and sometimes cylinder 1 but mostly cylinder 4. It is much better when it is warm out. and it reset itself a week ago when it was hot all week (I am in Florida)

I have this TSB for a 2.7t and it sounds like my issue. Has any one experienced and repaired this problem? I would hate to fork over $$$ for a flash that doesn't cure the issue. What do you think?

TSB 01-04-06 Update

Programming (Flashing) Engine Control Module (ECM) to Correct Cold Start Engine Stumble (Aug. 30,2004)


After Cold Start Engine Runs Rough. Vehicle (http://audiforums.com/forum/private.php?do=showpm&pmid=117414#) may Stumble, Buck and or Shutter on initial acceleration. Engine may stall at idle when transmission is shifted from Neutral/Park to Drive/Reverse.

Condition usually lasts for less than 30 seconds after engine start. Afterwards the vehicle starts and runs without any complaints.

Condition associated with the following DTCs.
P0300 Random/Multiple Cylinder Misfire Detected
P0301-P0306 Cylinder 1 through 6 Misfire Detected