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Ron, ASE Certified Technician
Category: Audi
Satisfied Customers: 35515
Experience:  ASE Certified Tech
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I have a 2005 A6 Quattro. Recently changed all coils,

Customer Question

I have a 2005 A6 Quattro. Recently changed all coils, plugs,valve cover gaskets. Also had compression test done and all w/in spec. Getting a P0305 misfire code but only at over 3500 RPM.Shop swapped coils to rule out bad coil and plug in cylinder #5.Only getting reading in cyl 5. Recently read on an Audi forum that it might be ICM. Does this sound like an ignition control module issue? Shop hinted at carbon build up and possible valve not seating right, however no compression issue as some friends have indicated to me that this would be the case if valves not seating right, as well as it would happen at low rpm which it doesn't. Another friend who has an 2007 A8, that it sounds more like an injector issue. He suggested Lucas injector cleaner which I am currently using. Car seems to run fine at steady acceleration and even at higher speed. Code only gets thrown at hi rpm. and will go into safe mode. ICM issue? I hope.
Submitted: 11 months ago.
Category: Audi
Expert:  Ron replied 11 months ago.

Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here. Your 2005 dose not have an ignition control module, the ignition coils are controlled by the engine control module. See the wiring diagram in the link below for the coil circuit. I would start with checking the wiring from the #5 coil to the control module to be sure its not a wiring concern. I would also check the injector on the #5 cylinder to be sure its not failing.

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