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1991 subaru loyale


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Hello...does anyone know what causes the idle to get bumped up when the ac is turned on? Is it a relay somewhere?  Its fuel injected. car runs and idles great..but when I turn on the ac the idle drops dramatically when the engine should actually increase the idle to compensate for the increased drag. Thanks

Edited by primosoup
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SPFI or carby fed EA82? 

Carby has a little vacuum diaphragm that pulls on the throttle to increase revs. 

I’m not familiar enough with SPFI to tell you what does the idle up. 

 MPFI uses a little solenoid on the side of the throttle body, but I think this only applies for the turbo EA82 and NA XT4  models in the USDM. We got the NA MPFI as an option in our touring wagons. 

Cheers 

Bennie

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