hello all,
Basicly i have this bmw 316ti 1800cc come in today, the fault is that if its idleing and you suddenly blip the throttle there is about a second delayon responce as if its holding back, then when it hits 3000rpm it sound and runs fine. the guy fitted a MAF sensor as someone told him its a common fault but did nothing. theres no mil light on, but scanned it and no codes so i looked at the o2 sensor values but i can only get readings from 2 of the sensors sensor 2 and sensor 3. sensor 2 at idle just stays around the 700mv mark but can get it to change if rev the engine, and sensor 3 stays around the 500mv mark, which i no from auto data is wrong but i stuck a new set of plugs in and it was slightly better and the o2 sensors moved more like they should but still not compleaty how they should be. next im putting a fuel filter on it as its still all genuine parts on it and there all well worn parts, so hoping thats all it is, but is there any common faults on theese i should be aware of??

sorry for the long post,
thanks in advance for reading.

regards
mike