Is there a way to adjust the idle? I seems to hover around 1000 rpms. Sometimes it slowly drops to 750.
If it's computer controlled, what do you think is causing it to be increased? This is a 4 cyl Camry with 80k miles automatic. Just replaced plugs, PCV, fluids. Seems to run fine otherwise.
Idle is computer controlled - through the idle air control valve at the base of the throttle body. Usually, a malfunctioning IAC valve causes the idle to be too low when it doesn't open fully. Could be you need to look at the idle up circuit for the air conditioner - that raises the idle to compensate for the additional load and is found on the other side of the intake plenum, closer to the front of the engine. Another possibility would be a malfunctioning temperature sensor. (just a guess) The factory service and repair manual is handy for this type of trouble shooting and includes flow chart diagnostic diagrams. Haynes repair manual (at much lower cost) has some of these also. Could just be a bad electrical connection to the temperature sensor, solved by removing, cleaning and reinstalling electrical connector. Temperature sensor should show resistance that varies inversely with temperature. Since the IAC valve typically shows low speed idle - if it's going to stick, and a questionable temperature sensor would tend to show driveability and mileage issues also, (running rich?), suggest checking the A/C idle up first. The A/C idle up controls the idle speed by varying it somewhat as you describe. When working correctly, idle should be 850 rpm with the compressor engaged, so if it were operating without the compressor engaged, could show the 1,000 rpm idle you're seeing.
I just noticed on my 97 Camry with low idling at start-up, that if I have the air conditioner on when I turn the key....the low idling either doesn't happen at all or goes away almost immediately. I'm using this method until my next oil change, that way i can save an extra trip to the mechanic.
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