Can you see a spark? Hook up a plug to the coilpack and rest it on a metal part of the engine. I think you will have to pull the rubber boot off the bottom of the coilpack otherwise the spring will keep pushing the plug away. If you have no spark, check with another coilpack on the no.4 harness plug. Still no spark, check ICM's:

ICM's are on the airbox - pull the plastic cover off the top and there they are. Number 4 is on the ICM nearest the front. Switch the ICM connectors so the front one is switching 1,23 and the rear one is switching 4,5,6. If the missfire moves to no.1, you have a bad ICM. Another way to check is see if you have a spark on no.4.

If no change, check the wire between ICM and ECU. Not sure which it is, there are 4 wires between ECU and ICM - check them all for continuity to the ECU connector (remove connector from ECU first to avoid your tester blowing the ECU).

If you have continuity there, check between ICM and coil harness plug. Wires will be the same color, easy to trace. One wire on the coil harness should read 12V, one goes to ground and the other comes from the ICM.

First, make sure you have no spark by using a plug resting on the engine, then you know you need to do the rest.

 

Checked thwe plug (why didnt I think of that? because im an idiot!) got no spark...Switched coils, still no spark.Switched ICM's, got spark on #4, none on #1...Guess I need to start calling around for a new ICM.Thanks.....

 

I wonder why it only gave me a problem with #4, and not 5 & 6? I cant beleive that little piece of **** costs like $200!! Assuming ignition cont module and unit are the same thing.

 

You can confirm where the unit is damaged:

Sorry, can't find the file. Search here or Passatworld for Primary Output Stage testing and you will find out how to test it - it is simply 3 transistors inside that case. There is even a guy that pulled the top and resoldered the broken joint. That could save you $200.

Good luck!

 

I cant thank you enough....I was going insane until last night when I found out what the problem was. It actually felt good to spend the money on that part, just knowing my car would be O.K., and I didnt spend an arm and a leg at the dealership between labor and diagnostic fees...I just read your post about possibly fixing the unit after I already put the new one in. Hey, you never know, I'm sure the other one will go at some point in time, maybe Ill be able to fix the bad one I just pulled out and have it ready to pop in..
Anyway, the car runs perfect now...Thanks for your help. If you give me your mailing address, I make some really nice Audi car decals, let me know if you want a set for free....
Marc