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> lil problem i need help w/, car is shaking when AC is on
post Jun 30, 2005 - 3:17 PM
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Toad

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There's probalby some simple answer to this but i need some help. I'm wondering whats the matter w/ the car. Its idling fine, but when the ac's on the steering wheel shakes, and the engine idles roughly, and the shake is worse when in gear. I doubt its something major, but i'm justing wanting to know what i can do to get rid of it.

thanks for any help

This post has been edited by Toad: Jun 30, 2005 - 3:20 PM


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owner off a 95 celica st... hoping overtime to be 1 kick ass machine =).

Upgrades (comming soon)- 3sgte engine swap
- small engine tweaks here and there
- new paintjob (black w/ overlay of blue pearl)

possible future upgrades- gt4 hood/bumper
- upgrade the 3sgte turbo.
 
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post Jun 30, 2005 - 7:00 PM
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kgr-gts

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The A/C is supposed to activate an idle-up circuit when the compressor is engaged. It should raise your idle *above* normal. The shop manual says 750rpm without the compressor going and 850rpm when it's on. (5SFE)

The idle-up hardware consists of a vacuum solenoid and a hose or two, mounted to an upper-rear corner of the engine. Yours might be broken or missing. If the A/C was installed at the dealer and not the factory, it's possible they left this part off. It's happened before. See if you have a 2-wire connector hanging loose near the back of the engine.

The only other thing I can think of is that your compressor is putting too much load on the engine even for the idle-up circuit to handle (i.e. compressor failing) but that's not likely.


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