Coil Problem or ICM Problem?
 

Hello guys I'm trying to diagnose a problem with a misfire and want to know if I should replace a coil pack or the ICM.

Vag Com Codes

16684 Multiple Cylinder Misfire Dedectet
P0300 - 35-00 - -

16689 Cylinder 5 Misfire Detected
P0305 - 35-00 - -

16686 Cylinder 2 Misfire Detected
P0302 - 35-00 - -


Here is what I have done, I removed all DTC's and it had the exact same codes pop up immediately each time thereafter. The car runs terribly, no power at all.

Then I moved the #2 coil I believe (drivers side bank center cylinder) to the #3 cylinder I believe (drivers side bank rear cylinder) and the trouble code followed the coil. When I moved the coils back to original positions the codes again followed the coil. I've also replaced all the spark plugs of course started with taht.

Forgot to mention, 01 Audi A6 2.7t Manual

If the code follows the one ignition coil that you have moved, replace it. The driver side center cylinder is #5, not #2. You moved it to #6, not #3, so it's kind of weird that the fault moved with the coil from #2 to #3.

There is also a possibility that there is more than one ignition coil that is bad. There is no law that two cannot be bad at the same time.

Use a magic marker to identify which ones you know to be bad, or you will find yourself putting bad ones back in the car.

It was a few days ago when I was doing the moving around so I may not be remembering it perfectly but it did seem that by moving one coil I could make the codes jump from the center two cylinders to the rear two though I may not recall the numbering correctly. Any input on where to get coils? I'm selling this car so I don't want to pay top dollar but of course I don't want to buy junk and cause more problems also so where do I find reasonably priced good coils?

I find the factory coils to be pretty good, and keep a couple in the rear cubby of the trunk. I typically spend about $20 (check ebay) for used ones, test them immediately on receipt, mark them as good and have them handy. I have two coils and one icm in each of my 2.7Ts at this point. I also carry my laptop and my vcds cable with me on long trips... Nothing would irritate me more than having to spend a fortune for a diagnosis or new ignition part while in another state.