Question about 1994 Honda Civic

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When my civic is idling it goes up to 1500 revs then drops back to 800 revs and continues to go up and down like this even when the motor is up to temp

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Hi, have you looked for a vacuum leak around engine you should be able to hear a hissing sound if you have a vacuum leak. If no vacuum leak, try unplugging your idle air valve,if it idles down to normal replace or take off and clean very good. If i can help you more just re post

Posted on Jan 04, 2011

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Check the level of coolant. I know it sounds silly, but coolant runs through the throttle body. If you are low on engine coolant it will cause an idle surge. A vacuum leak would cause a constant high idle situation

Posted on Aug 04, 2012

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