On my 2004 cayenne turbo with EVOM tune, I have been having stuttering under high boost with CEL coming on and codes reading out as misfires on 3 of the 4 bank 2 cylinders. My first guess is spark plugs or coils. I run revision 09 coils and Oem spark plugs that I gapped to .030. I am assuming that coils or spark plugs are going bad but would it be unusually that it has only happened on one bank of the engine. My plan is to replace all coils and spark plugs with upgraded revision ones but should I be looking for something else since this focused to one bank. Also should I be fine keeping the plugs at the recommended .032 gap with a tune.

 

As an update, I went with the newest revision coils (.21) and replaced the recommended denso spark plugs from EVOM with stock OEM beru plugs and it solved the problem. The frustrating thing is that I tried these spark plugs in the past with no help so I am not sure now what has helped the problem. I am know have a good set of revision .09 coil packs if anyone needs some.

 

i had the same issue.. changed coils and plugs and then also both fuel pumps... so far so good.