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1990 964 C2 on start, poor idling/throttle response

yesterday AM, On start up the idling was balky and engine stalled several times. After warm up things improved but the throttle response was delayed and never produced the usual power. After driving some then parking and shutting off the ignition I restarted an hour later. The engine ran better but still hinting at trouble. After shut down and subsequent restart it bucked and sputtered then died. No point in flogging a dead horse. I have experienced similar problems over the years with other makes. This sort of thing in the past has pointed to closed points, faulty coil, clogged fuel filter. That sort of thing, while I have owned a few Porsche's over the years I've never had to "learn" them and have some catching up to do. I'm more familiar with the older stuff..
I got a set of factory manuals for the 964 but I'm getting the feeling they are woefully incomplete. Any how "Thanks in advance" for any suggestions on repairs or reading materials. Scott

Old 09-10-2007, 06:48 PM
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Here's my checklist:

1) DME
2) Fuel Filter
3) Airflow Sensor

My vote's number 3; but very interested to see if AF Juvat or Bill Verburg have a more informed opinion.
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Old 09-10-2007, 07:55 PM
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1990 964 C2 on start, poor idling/throttle response

yesterday AM, On start up the idling was balky and engine stalled several times. After warm up things improved but the throttle response was delayed and never produced the usual power. After driving some then parking and shutting off the ignition I restarted an hour later. The engine ran better but still hinting at trouble. After shut down and subsequent restart it bucked and sputtered then died. No point in flogging a dead horse. I have experienced similar problems over the years with other makes. This sort of thing in the past has pointed to closed points, faulty coil, clogged fuel filter. That sort of thing, while I have owned a few Porsche's over the years I've never had to "learn" them and have some catching up to do. I'm more familiar with the older stuff..
I got a set of factory manuals for the 964 but I'm getting the feeling they are woefully incomplete. Any how "Thanks in advance" for any suggestions on repairs or reading materials. Scott
Old 09-10-2007, 09:10 PM
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sounds like a sensor issue leading to a timing problem.
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Old 09-11-2007, 07:03 AM
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Sounds like one side of the twin plug ignition system failed. Disconnect the plug from one of the Bosch ignition modules on the left side of the engine compartment, start it up and see how it idles. Turn it off, plug it back in and unplug the other one and repeat. If it idles different or doesn't start, you need to check the coils, distributor belt, wires, or even the ignition modules.
Old 09-12-2007, 04:35 PM
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+1 on the secondary dizzy not producing a spark. If the car won't start if one or the other plugs at the ignitors are disconnected you probably have a bad belt inside the distributor.

Does your car have the ventilation kit installed? It is a little rubber tube that runs from the fresh air hose (connected to the electrical engine fan) to the distributor base. Its purpose it to vent the ozone produced by the sparking in the caps. Ozone is responsible for premature belt failure on 964 NA cars. The belt becomes brittle and rips.

Cheers,
Ingo

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I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
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How about a NoBadDays DualChip for 964 or '95 993
Old 09-12-2007, 06:22 PM
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