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-   -   Idle speed w/AC on (http://forums.pelicanparts.com/porsche-911-technical-forum/488690-idle-speed-w-ac.html)

Rev-it 84 07-30-2009 12:41 PM
Idle speed w/AC on
 
I've got a 1984 Carerra, and when I turn on the A/C the idle speed drops to 800rpm from 880. I thought it should increase 50 rpm. Anyone have any insight? Thx.

teenerted1 07-30-2009 01:25 PM
drops due to the load you just added

pete3799 07-30-2009 01:27 PM
Your turning a compressor hence lower RPM.

rick-l 07-30-2009 01:52 PM
The AC compressor status goes to the DME. What it does with it??? Your guess is as good as mine.

DRACO A5OG 07-30-2009 02:49 PM
Yeap Normal.

Hey do you have a Chip Mod? 84 RPMs should be 780-800 RPMs. If chipped it should be 880.

Rev-it 84 07-31-2009 06:43 AM
no chip mod, but I am about to order Sw chip. Ive done everything I possablly can do to get this engine running smooth at idle. All sensors are new or adjusted no vacume leaks, complete rebuild 5000 miles ago, valves adjusted. I figure that when the A/C is turned on that the DME will compensate with a higher RPM with the increase in load.


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