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4

This issue might take some step-by-step diagnosis to find the source of the issue. Since it sounds like a repeatable issue, it should be able to come up with an educated root cause (instead of just throwing parts at the issue). I think Peter's suggestion is a good place to start (finding any fault codes in the ECU). After that, I would suggest testing the ...


4

I had a similar-sounding problem on a VW New Beetle. The car would start from cold fine, but after 15 minutes of running, it would be very difficult to re-start. It turned out to be a defective coolant temperature sensor. Replacing the sensor fixed the issue immediately. The computer was showing a code of P1296, which indicates a coolant-system defect.


3

If you planned on driving this more than once, I would replace all fluids in the car (oil, transmission/clutch, brake, coolant, power steering, etc.) I would then look over all rubber belts and tubes to make sure they are all still in decent condition, if not, replace. Vacuum lines need to be in decent shape also. Once you know your brake system is in ...


2

Let me also suggest that the backfire issue is related to ignition, not the valves. Check your timing, which you said you did statically, and also check to be sure the plug wires are in the proper place on the distributor. Easy to mess that up and it will cause a major odd firing of the engine. the above comments about fluids and tires is also on the money, ...


2

This is a very known problem of this model (Porsche 924). Your WUR (warm up regulator) is faulty, and it needs to be changed. Read this link for more info: http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/443505-how-do-i-test-if-warm-up-regulator-bad.html



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