Long story short, I bought my coupe after it had stood for approximately 7 months. Car is cracking but low down power output sometimes seemed a bit lacking and I seemed to be struggling to get the same MPG other people have reported. The idle when cold was also slightly up and down but did get better when warmer and the car seemed to have minor flat spots when cold for first couple of minutes too. Plugs are not new but appear ok condition wise so after changing the air filter I decided to unplug the maf, results:
Good
Alot more torque
Much better throttle reponse when "sport" is turned off
Slightly better MPG
Smooth idle
Bad[/b]
When cold revs seemed to increase for first minute when starting as and when the brake pedal was pressed.
I have since driven the car with the maf un plugged and plugged in across many miles in different road conditions and I am convinced there is no placebo effect here and unplugging the maf noticeable improves / resolves the issues described above.
Car is showing NO CODES on INPA. When I first scanned the car there was an intake Vanos code but this hasnt come back once since I have had the car.
So I guess its either going to be a vacuum issue or maf issue. I havent taken anything apart but I cant seem to see any vacuum leaks and have sprayed the intake area hoses with brake cleaner and not noted the revs increasing. The only two other things worth mentioning are as follows:
- I can hear a minor hissing from the drivers side but cant seem to locate this and not from research other people have mentioned this as occurring with their cars
When removing the engine oil cap with the engine running a drumming sound can be heard clearly. This can be heard with the oil cap on but very very faintly.
Any advice welcomed! Thanks.