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Idle bypass/control valve. It's buried under the center of the intake manifold bolted to the block with a bent sheet metal bracket.
This is a blade or "knife" valve that is opened with a bimetallic spring and resistance heater element.
There are two larger diameter vacuum hoses going to and from it.
If you pull the electrical connection on it and check the pins on the valve you should see some resistance from the heating element. If you do then pull the top hose and squirt the heck out of it with carb cleaner followed by a penetrating spray.
If there is no resistance then the heating element has gone kaput and you need to replace it.
Note: The post 85.5 944's use a different designed valve. It is not interchangeable. The 944S's idle valve is different from the rest too!
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Never break more than you fix!
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