sundog wrote: ↑Sun Jan 08, 2023 11:38 am I doubt it would run correctly with it wired incorrectly.Background on issue…. The 964 would run fine and then after some time and without any warning, it would buckle, want to die, then back on after some delay between pressing the accelerator and rpm’s going back up, basically it would be quite the rodeo, and then die. When initially researching, it seemed to be due to a faulty crank sensor but now I am thinking something else (unless I crossed my wires) hence the poor running and dying upon startup. Perhaps AFM or head temp sensor as you mentioned?
Do you have the diagnostic kit which reads the DME? I’ve had similar issues when the idle switch is sticking, and the engine head temp sensor is bad.
jacke2c wrote: ↑Sun Jan 08, 2023 2:53 pm Also, the wiring harness that plugs into your mass air flow sensor is supposed to be folded and tie wrapped to keep it from becoming straight. I know this sounds strange, but I cut mine because i thought the wires would be in a bind, but I soon learned that they need to be folded as per Porsche Specs. rough idle was one of the symptoms. Again, that was 15 years ago...I read about that last night and I pulled the TSB which appears to be for MY89 and MY90 and mine is a MY91, so I don’t think I would have an issue due to shielding/wiring. Worst case is that I pull the air box and AFM to give it a cleaning and check the wiring to make sure it is ok.
jacke2c wrote: ↑Sun Jan 08, 2023 2:53 pm Have you checked your secondary distributor belt? Have you tried disconnecting one ignition ignitor (the little module located bolted to the face of the coil bracket) (beware that they will be hot if the engine is or has been running) at a time to be sure its firing on each coil? Both are symptoms that are common in the 964-993 world.... That is why a lot of 964 owners convert to 993 coil systems to get rid of the weaker failure prone 964 coils.I removed the distributor caps and tried to turn the rotors by hand but could not, so I believe the belt is fine. I have not played with the ignition coils yet but will do so if I can keep the car running long enough, thanks for the suggestion.
LPMM wrote: ↑Sun Jan 08, 2023 3:04 pmOuch, if no other codes, then check the live values and compare with normal values for startup, in Adrian’s book.sundog wrote: ↑Sun Jan 08, 2023 11:38 am I doubt it would run correctly with it wired incorrectly.Background on issue…. The 964 would run fine and then after some time and without any warning, it would buckle, want to die, then back on after some delay between pressing the accelerator and rpm’s going back up, basically it would be quite the rodeo, and then die. When initially researching, it seemed to be due to a faulty crank sensor but now I am thinking something else (unless I crossed my wires) hence the poor running and dying upon startup. Perhaps AFM or head temp sensor as you mentioned?
Do you have the diagnostic kit which reads the DME? I’ve had similar issues when the idle switch is sticking, and the engine head temp sensor is bad.
I have a PDT999 but it showed 0 faults when I plugged it in, so![]()
:bigok: Any "good guys" on TOS, should[…]