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Join Date: May 2002
Location: Santa Barbara, CA
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Sid,

First the basics:

Have you confirmed you have power to the DME? Turn the key to ON and check that the silver canister on top of the engine (ICV) is vibrating. If not maybe an aftermarket alarm is killing power to the DME. Then, while you crank make sure the fuel pump runs (have voltmeter on the fuse and watch through windshield)

Yes it could be the DME but can also be as simple as a bad DME relay. These are cheap (around 25$ from our host) and you should carry a spare. They are known to go bad.

Then, if cars sit long the injectors get stuck shut and it takes some gentle tapping to make them work again. But that would still give you a spark, just no fuel.

The other component that will kill spark and fuel are the sensors on the flywheel. There are two and they do age and fail. You can Ohm them out for a quick check. Do a search for DME flywheel sensors. Lots of posts. You should see something like 900Ohm between the active pins if I remember correctly. If one is open the engine won't start.

Good luck,
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
Old 01-20-2014, 02:01 PM
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