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Newbie with a bit of a problem...

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dac68

New member
Hi all,
I've had my 1988 lux for about 8 weeks now and it has covered 2k or so without any mechanical snags. Now the however bit....
Went to start it yesterday AM and it would start but not idle, will idle as long as I press on the throttle, but just dies as soon as it is left to idle.
Battery is fine, immobiliser appears correct, nothing has been touched under the bonnet to cause a snag. I have sat and thought about it and am inclined to think that it might have something to do with the infamous dme relay.
The car is stuck in portsmouth at work for the weekend so i have all weekend to ponder and get things together before attacking the snag on monday.
Any thoughts or comments are much appreciated.
 
I think your car has the same throttle position switch that the turbo does. It's a microswitch on the throttle cam that tells the ECU when the engine is on idle. You are not on map when idling. If you turn the throttle cam manually you will here a tiny click when it returns to idle. This is the throttle position switch. That's where I would start mate.
 
Not sure wether it will idle when warm, the problem appeared overnight, everything was fine the previous evening, when I get back to Pompey I'll try to run it for a bit and allow it to warm up and see if it makes a difference, along with looking for the microswitch.
 
Ok, back at work now, and I've run the engine at a fast (2k) idle for about 2min. on releasing the throttle the revs dived but recovered to 1200ish and thensettled to 850-900rpm. I have given the problem a good googling to and it does look like an idle control valve snag. I will probably get the car home before taking it out and trying to clean it.
there is a dit on testing and cleaning it here http://en.allexperts.com/q/Porsche-Repair-829/2008/3/Porsche-944-erratic-idle-1.htm
Has anyone done this before, and was it succesfull?

 
Hi
Keep going along the lines suggested above, but problem sounds a bit like one I had years ago on a Lancia with very similar system, which turned out to be a fuel pressure regulator.
Mike
 
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