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View Full Version : a8 missfire agen....



turkey
01-02-2008, 09:44 PM
i know there has been a recent thread on this but mine deff not coil pack or injector,compression is good and doesnt bring up any codes. its a 97 a8 3.7s and number 4 cylinder just wont fire...it started all of a sudden the other day...just driving along fine then startd 2 missfire and aint run right since. anyone give me a clue.........

s8.
04-02-2008, 08:04 PM
Have you confimed that the misfire is caused by ignition failure and not by fuel delivery failure to cyl 4 for example due to disconnected fuel injector etc.

turkey
04-02-2008, 09:20 PM
it deff not injector fault,ive swopped them between cylinders 3 and 4 but the missfire still at number 4.
fitted new plugs and coil pack also....

s8.
06-02-2008, 09:38 PM
Have you done a compression test also?

Cheers,

pauldbryan
22-01-2010, 05:49 PM
I had a very similar problem on my 98 2.8 sport, I put it on to a couple of garages any could not diagnose. I ended up replacing the Air Flow Meter, it was dead easy and cheap and it sorted my fault out.