Idle jumps to 1500rpm when a/c cycles on


V8Notch

15+ Year Member

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Jun 16, 2008
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My idle jumps to 1500rpm when the a/c cycles on and off. Not when the A/C is running just the pump clycling on and off.

The IAC valve is new and it idles fine other than that.

I've reset the computer by leaving the battery disconnected for a while. Sounds like I'm reving it.
 
Sounds to me like the engine is having a hard time idleing and when the a/c load hits it the computer thinks it is dieing...so it revs the engine to keep it running.
How is the tune? How many rpm is it ideling at without the a/c working?
Big Jim
 
New plugs, fuel filter last summer, maybe 7K on them.

Idles at about 7-800rpm with out the a/c. Completely stock.
 
Thats sounds normal. When the a/c compressor comes on the rpms increase so the motor isn't loaded. You also need to be aware that the a/c is running under defrost and other heater settings.
 
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