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? I will take it to garage to get it scanned for faults if needed but just wondered if there is anything obvious that i am missing. Any ideas would really be appreciated. Cheers.

 

is your check engine light on/flashing? what year is it? how many miles?

 

yep check for fault codes

 

Its high milage 170,000. 1986 model. no sign check engine light.
Cheers.

 

Scan the car for engine codes.

 

It may be hard to scan a pre-1996. Do you have the service records?

 

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.