Quote:
Originally Posted by blucille
I've got a 1989 964 c4 3.6 in my '79 SC. the car runs great except cold starts. I've replaced the rubber boots between the intake runners and plastic inlet ports, no change at all.
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If the Head temp sensor in not at fault, in this order I would try the following:
1) O2 sensor disconnect start
2) Check the ICV/ISV functionality, take it off and spray some brake cleaner through it.
3) Check Closed throttle idle switch works properly, verify ohms at closed throttle and the open circuit when throttle pressed.
4) Clean your AFM and ensure the air temp sensor is functioning correctly. Check AFM meter for worn contacts with barn door activation. Do a forum search, tons of info on how to move the contact traces over on fresh track if the resistance doesn't check out initially.
5) Valve adjustment
Good luck!!