Question about 1992 Toyota Land Cruiser

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Toyota land criser idling problem

When i turn on the engine it goes up to 1000rpm. when i turn on the ac is suddenly drops to 800rpm. y is that?

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Hi,

The engine RPM dropping from 1K to 800 when the A/C is turned on would be because the engine is now powering another load, the A/C compressor. However, most designs incorporate a "compensator" that increase the idle back to 1K. This is accomplished with a solenoid coupled to the throttle opening. Electrically, this solenoid is powered in parallel to the A/C compressor. Once energized, the solenoid would open the throttle a little bit more. If your engine has one, then it could either be defective, not electrically connected to the compressor or the reach of the solenoid is not adjusted to push the throttle a little bit more.

Of course, there would be instances where the solenoid is simply installed.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 29, 2008

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