Would anybody know the symptoms of a bad icm? im getting a knocking noise from it and well im not really sure if its just acting up.

 

cylinder 2 misfire, running rich, heavy misfiring, etc.

 

Well i use to have a random misfire on 2 and 3 but that hasn't happened in awhile and then i did get a code for running to lean dont know how i got that one. But what could the knocking be though

 

Do you have enough oil? The knocking is probably not an ICM, it doesn't "knock". Obviously i cant hear the sound though, and its hard to tell what you're talking about. Lots of things knock: internals, pulleys, loose items, wastegates, etc. Are you hearing a ticking type of noise by the ICM? (Note, a tick differs from a knock to me because its quieter and softer.) There is a check valve on top of the air box that ticks. I think its normal, but i dont want to pay $70+ to replace it and find out. Its a small cylinder on a vac line.