Running like a dog1995 BMW 530i (V8) - automatic

[Mark Burstow]

Hi,

I am about to buy a gallon and petrol and put it on (not in my car).

the car in question is a 1995 BMW 530i (V8) - automatic

It has been sick, refusing to idle, difficult to start, refusing to rev.

So, i purchased a lovely digital multimeter, a Bentley manual and set to work.

The impedence in the throttle position sensor was to high, as you went through the rev range and the Idle Control Valve resistance was far too high when the car was warm

I duly purchased both parts, they are second hand but when tested are within all the tolerences.

It starts fine now and mostly runs well, however sometimes it cuts out at idle and sometimes won't rev and if you hold the the throttle down it revs between 2000 and 300 rpm.

Been back through the tests but these seem OK

Any thoughts?

Thanks

[cj1995]

plugged cats maybe. Had that happen to a chevy truck once. Catalytic converters were plugged. An exhaust shop can check them. They just drill a small hole, and put a pressure gauge in and test for back pressure. Good luck, Im about to pour gas on mine too!

[witeshark]

Thread 3 years ago