lil problem i need help w/, car is shaking when AC is on Options

[Toad]

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

[kgr-gts]

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.