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Been here a while
Join Date: Apr 2004
Location: East coast, west coast, typ. 35,000 ft
Posts: 2,452
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how does a 3.6 know it's a cold start?
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.
The car will start and die right away, probably 20 times. after 10 or 15 tries I can feather the gas and keep it running, and by the time I get up to 20 starts it'll run, but not well. After a few minutes of driving, it's flawless.
Is the cylinder head temp sensor how the ECU determines it's going to richen the mixture for a cold start, or are there other electronics I should investigate?
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looking for 1972 911t motor XR584, S/N 6121622
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