Reply to "Exciting -------------- when the throttle hangs up !!"

ausfordMember

[/QUOTE]What is interesting is that the car idles at different RPMs dependent on engine temp. Weird.[/QUOTE]

There is a thermostatically operated valve that provides a vacuum source to the distributor from either the carburettor venturi or the inlet manifold depending on the engine temperature.

It is usually set up so that when the engine gets hot the distributor receives manifold vacuum, the theory is this speeds up the idle speed to run the fan (on normal sedans) and water pump faster thus helping to bring the temp down.

I have heard on Panteras it is some times set up the opposite way (i'm not sure why) but this feature will cause the different idle speeds at different temps either way it is set up.

7/24/139:18 PM

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