Quote:
Originally Posted by E Sully
Your correct about the altitude sensor. It should be an open circuit till 1,000 meters. When above that it closes the contacts and leans the mixture.
I live in NY where it would never be necessary, and drove an '86 engine with no sensor installed on my car and it worked perfectly.
As far as the cylinder head temperature sensor, I had installed the newer style 2 wire sensor before I put the engine in my car. There were occasional issues with the original single wire unit, that is why Porsche updated it to the 2 wire unit.
When the full throttle switch engages it uses a different map and makes the mixture richer, bypassing the O2 sensor and shutting off the A/C.
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Not exactly, the DME unit has no possibility to shut off the A/C. There is indeed a wire link between A/C compressor clutch power line and pin 29 on DME unit, but this pin is an input, not an output. It is used to inform the processor that the A/C compressor clutch is engaged.