Tried posting this in the technical section but it seems very little interaction way down there!
I’m looking to understand which sensors control the fuel mix on the 2.0tfsi engine.
MAF, Coolant temp and what else?
A4DTM 2.0TFSI Quattro
My car seems to be running rich, it keeps fuelling on no throttle giving some burps etc on engine braking (which it didn’t before) and has a throttle lag then a sudden boost!.
Also puffs some smoke out if you have been cruising on part throttle and floor it.
It doesnt smoke at all on full throttle just a fter a period (10 mins) of partial throttle cruising I have VCDS and checked the throttle alignment and position sensors and they seem fine.
Car makes boost and I have a boost leak test kit so it’s not a boost leak.
Unplugging maf improves things so I cleaned it using MAF cleaner. Worked a little but not back to the way she was.Planning to use my usual "replace the cheapest thing first and work up to the most expensive" so any help appreciated.
Car still drives great and is fast but something is not right. Happened when i was overtaking on the motorway a few weeks ago. Symproms were surging boost at mid throttle. I can drive round it but i get the feeling it could be something daft. (last thing, it drivesbetter when cold, although i never WOT before its up to temp. )