Porsche Enthusiasts Club Forum

Hi folks,

I got my 951 a few weeks ago, though I am not new to the model, I have had a few 951's in the past..

It's a 1990 250 car.

This car was running fine, then out of the blue the power cut whilst driving - for only 1 second - a little blip.. then it was running fine again for a few miles. the fuel was low so I fuelled up. All was well for another couple miles, then all of a sudden it lost power again and coasted to a halt. It would not start.
I waited a few mins then turned it over again, it started and was running perfectly for another 25 motorway miles.
When I arrived home with it, it cut out again at the end of the road. I tried to start it and managed to get it to run but it would not idle and was running on what felt like two cylinders, I can manage to ease the revs up beyond 4500+ and the it evens out and runs smooth, but come off the gas and its back to running like two cylinders and will cut off if I come off the pedal. This is how it stands now.. starts only if you squeeze the pedal, runs rough and will not idle.

I swapped out the DME relay with an S2 that I have here and it made no difference (and the S2 would run with the relay from this car) so obviously not that at fault. There is plenty fuel in the car too.

Not sure where to go from here. If I can sort it myself it would mean I don't have to get it recovered and taken to specialist..

Any ideas?? Strange, it was running really well, smooth and quiet, producing good power and boosting well..

Thanks for any suggestions!!

The afm or the connections to the afm? Try unplugging the afm plug and spraying in some WD40. If that works invest in some contact cleaner and use that. I had a similar issue.

Stuart

Thanks Stuart..

I will give that a try.. you mean the air flow meter (afm?)

I do indeed!

Stuart

I would have a look at both crank sensors too.

hi

have your distributor cap and rotor been replaced recently ?

as this sounds like an issue that I had, and it turned out to be worn distributor cap and rotor .
I do maintain the car but although it did not look bad it was in the end the cap and rotor.

cheers roy

After giving my ignition system a once over today I would agree. The cap and rotor arm would be my suspects.

another from experience ------ rotor arm and dizzy cap