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Registered
Join Date: May 2002
Location: Santa Barbara, CA
Posts: 4,821
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Ignition switch, DME relay, FW sensors, DME come to mind.
Easy decision on the DME relay: get a new one as you should have a spare anyway.
The ignition switch (electrical part) is not that cheap so testing would be what I'd do.
The sensors can be intermittent and at 80$ per it's not a bad idea to replace them after almost 30 years.
If the tach dropped this would point towards power or sensors rather than DME itself. Start getting out the wooden screwdriver handle and tap things while the engine idles.
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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