Hi, I bought the car about a year ago and it has run fine. But it has always had a whistle when accelerating betweek 2-4k revs. I recently had it serviced, plugs and air and fuel filters changed. A few days later the car started to run really rough. very erratic at low revs,kept stalling and didnt feel right at higher revs. I have looked for air leaks but cant see anything obvious. The plugs are sooted up even though they are nearly new. Also the reading on the dash for the mpg seems to be reading wrong. It reads about 25mpg when I am sat still and reads constantly between 60-200mpg when driving. Could a sensor or other problem create a wrong reading and mess up the running? Any ideas would really be appreciated. Cheers.

 

have it scanned for fault codes

 

Definatly run the faults. It sounds like your running extramly rich. Possible malfunctions inclued maf, fuel pressure regulator(possible broken diaphram), or leaky injectors.

 

Thanks for the advice. I had it scanned and it turned out to be the throttle needed cleaning out and a temperature sensor was reading wrongly. Runs brilliantly now. Cheers.