Question about 2009 Toyota Camry

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My 2009 camry has started idling rough only when ac on. You can feel it really bad when braking, stopping, letting off the brake to go or slowing down. It only happens when ac is on. What could this be?

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When the AC is switched on, the engine has to rev up by few hundred RPM to take up the additional load of the compressor.
So the fuel pump will change settings to supply the extra power for the engine.
Hence it is important that you get the engine tuned up as the idiling speed must be adjusted and then the idling while AC come ON.
Tune the Fuel with the AC switched OFF , on activation the engine gets the signal to rev up.

Posted on Aug 22, 2010


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Posted on Jan 02, 2017


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