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Registered
Join Date: May 2002
Location: Santa Barbara, CA
Posts: 4,821
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Here are some pointers:
How do you know that you are getting sparks - did you pull a plug wire and used a spark plug against the engine body. To test for fuel you need to check fuel pressure and get an LED test light. It will show injector pulses.
Usually, if your DME relay is bad your fuel pump doesn't come on during cranking. This can have to causes.
a) bad DME relay
b) DME relay doesn't get signal to turn on from the DME
If you jumper the fuel pump and it runs that tells you it's physically O.K. Now if the car still doesn't run this would suggest the DME is not turning the DME relay on during cranking or you have another issue. Check if the fuel pump runs while you crank. My guess it is running. If not you have an issue inside the DME.
My next guess is that you could have a bad flywheel sensor. Either the speed or the reference sensor could be marginal and on its way out. There was a recent thread here where a guy had one of the sensors (speed/reference) bad in his car. I forgot whether he wasn't getting spark or fuel. After replacing the sensor the car ran fine again.
Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430
I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!!
How about a NoBadDays DualChip for 964 or '95 993
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