No fault codes but long term fuel trims keep rising at idle. 15min @ idle bank1 ltft +20 and bank2 +8, stfueltrims +0.7-1.5 both banks. This could indicate vacuum leak but I cant find any. When driving normally ltft are wihting spec about +3-5. O2 sensors are working normal at +1500rpm (0.2-0.9v) but at idle they keep constant voltage and does not change rapidly.
Maf sensor reads normal voltage at idle and has 3,7g/s. At wot max 207g/s, is this normal?
Car has some low end hesitation and is a bit sluggish. Also cold idle is rough before 02 sensors starts working, like slight misfire type sound. I think car has original maf and O2 sensors but spark plugs are new. Maybe I need new MAF? It has been cleaned thoung..