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Old 01-20-2019, 08:28 PM   #5
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seningen's Avatar
Join Date: Jul 2008
Location: austin
Posts: 763
Originally Posted by Topless View Post
If the motor cranks ok, the battery is fine. Eliminate that from your possibilities. When the battery is toast it will not turn over with the starter. Period.

Now to the issue. Several possibilities:
1. Failed/intermittent ign switch. A very likely possibility
2. Failed crank position sensor. Maybe but usually once they die they will never start again.
3. Failed/intermittent fuel pump.
4. Failed/intermittent ECU

Change out the ign. switch first if you can't clearly isolate the problem. Cheap and reasonably easy.
Switch good and swapped
Cps good, scoped signsl at dme
Fuel pump works, no gnd signal from dme to relay
ECU good, starts another car all day long
No spark
No fuel injector signal
Drivers: '08 Cayenne Turbo, 96 993 Çab/Tip (wife's) & '92 964 Cab
Race Cars: '75 911 RSR Clone & '99 Spec Boxster
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