Intermittent misfires on idle - what to log?
Posted: Sun Nov 15, 2020 8:13 pm
Hi folks. I've got a 2013 RS6 which has had some misfiring when the car is idling. Normally this happens after a drive, and when I park up I can hear the engine stumbling. I get about 10-15 misfires then it stops. I'm looking for some advice on the logging. I've been looking at all sorts of sensors but I can't see any relationship between the misfires and the values of anything obvious like fuel, turbo, o2, temperatures etc.
Misfires are happening randomly on cylinder 1, 5, but mostly 7.
So far I have done 4 bottles of injector cleaner, replaced all 8 spark plugs and I have 8 new coil packs in. No change so far.
Can anyone recommend some things to check? I'm fairly new to logging data with VCDS, but I'm willing to learn. The strangest thing I can see so far is the difference in O2 sensors and fuel trim between the two banks.
Misfires are happening randomly on cylinder 1, 5, but mostly 7.
So far I have done 4 bottles of injector cleaner, replaced all 8 spark plugs and I have 8 new coil packs in. No change so far.
Can anyone recommend some things to check? I'm fairly new to logging data with VCDS, but I'm willing to learn. The strangest thing I can see so far is the difference in O2 sensors and fuel trim between the two banks.