I completed the timing chain job and put the drivetrain / new clutch + flywheel back in about a week ago. It hasn’t been running well since the job, I don’t hear any of that typical rattle on start up, but it runs like a bit of a bag of potatoes misfiring etc. I used a basic vagcom scanner 3 days ago and got a cyl 5 and 7 misfire (can’t remember the code #'s), then yesterday i began to lose lots of power, as if it were running a cylinder short. When I did WOT from 2000rpm i would initially get a pop and hesitation (backfire) and then accel with about 150 less hp. It sporadically idles somewhat ok, and then terribly. I have scanned and cleared codes a number of times in the last few days now, and the cyl 5 misfire consistently comes back, whereas haven’t seen cyl 7 since the original scan. The CEL will sometimes be on solid, and other times be flashing.
I swapped the 5 and 6 coils with no success, ie the cyl 5 code stayed with cyl 5 after swapping. I have read a number of other threads on related issues and there seems to be a range of possibilities; from harness to ecu to injector, etc. I am going to borrow a fellow B6 S4 owners rosstech tomorrow to try and troubleshoot this a bit. I hope that the codes are more highly descriptive. If you guys have any input on this, it would be greatly appreciated.
I locked out the crank with pin and the cams before doing this job, I can’t see how I could possibly have caused it to be off by a tooth! Unless it’s possible to put the chain on incorrectly, but it seems to me that is impossible. Also wondering if the hall cam sensor on that bank could be cause a specific cyl misfire.