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Q: why my car idling fast?

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My car is idling up fast

My car has 120000 miles.

A: Hello. Your car will have a high idle for a...

Hello. Your car will have a high idle for a number of reasons, the most common of which, is a vacuum leak. I typically start by checking the engine for any loose or cracked vacuum hoses. If those are fine then I clean out the throttle body -- as carbon build up in the bore will cause the throttle plate to hang up and not close as it should. If that is fine then I typically test and replace the idle control valve. It is a solenoid that the computer uses to control the engine idle. If this is something that you plan on having repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your high engine idle speed.

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