Question about 1991 Honda Accord

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Problem is the engine revs up and down on its own

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The throttle on your carburetor or fuel injector is sticking.

Posted on Nov 05, 2010

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1 Answer

Engine revs up and down while driving


How is it at idle? A fast idle might be the result of a vacuum leak. Is there a check engine light with a code? Did you clean the mass air flow sensor?

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have the OBD read by a suitable mechanic ,sounds like an engine sensor ,the crank sensor would be my first thought as the rev, info is sent from that sensor but you need the code to be sure

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My jeep is missing when idling and rev it and revs comes down slowly and missing just above 1000 rev and then falls to normal rev.what could be wrong?


If the engine has a constant miss the computer should record a trouble code or two.
Is the check engine light on ?

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Engine revs goes up and down


engine Normally revs up upon start up of car.Then goes down after a few minutes.If not, then adjust the timing of iac and TPS.

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I only just brought it v6 1991 wont rev out clean dies down at high revs


it has a rev limitor on it.. at high revs the computer shuts the engine down to prevent damage.

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Revs up and down at low revs


you need to clean or replace your idle air control valve(IAC). The IAC allows your engine to idle smoothly by opening and closing a valve that allows air flow to the engine that is monitored by the computer. The IAC get dirty causing it to stick and move slower than it should which causes the up and down idle

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