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CEL: "RPM High" (P0507)

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Two days ago I was driving through a parking lot when my CEL came on. I stopped by an AutoZone and checked the OBD error codes. The only one I got was P0507: Idle Control System, RPM High. After clearing the code it has not come back. The engine seems to idle fine.

2-3 weeks ago I changed the oil and the spark plugs.

1 week ago I changed the air filter and cleaned the throttle body.

I've driven the car daily since. My first thought was I might have damaged the throttle body.

Anything in particular I should be watching for?

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  • 3 months later...

Okay so the light came on a couple more times and after 3-5 trips would turn off.

I finally noticed the pattern for when it would turn on. It is only when I have the A/C turned off. After a couple start-stops the light comes on after I start to accelerate. Watching the tach, the RPMs never go over 1,000 while at idle.

Why would the A/C being off cause this error?

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The A.C. (on) demand a extra load from the engine, the idle RPM should be adjusted by the DME. Perhaps there is something wrong with the throttle body, the O-ring behind the body or the rubber intake tube from air filter to body (poorly connected) as wross996TT suggest. If you cant find nothing wrong, a visit to the dealer is the only way to go.

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