Question about 2004 Honda Civic

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Honda civic type r

Failed mot for emissions and when u start the car up whether cold or warm,it revs up and back down continously.please help smells like its running rich,drives ok and all but at idle the revs keep going up to about 2500 rpm and back down

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  • Anonymous Mar 29, 2014

    I've been told car is running too rich

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If its running rich and the idling is up and down suspect your oxygen sensors and sort as soon as otherwise it will destroy you catalistic converter [very expensive] yates210456

Posted on Oct 08, 2008

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I bought a car from the auctions , it preveously past it's years mot a week ago. , on driving it home the emissions light has come on . Also the revs do not sit when idle when cold although once warm they...


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1993 honda civic ex will not pass HC emissions test. Please help


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I had the same problem in my 97 civic dx. Once the car warmed up it would rev up and down whenever the car was idling over and over again. To fix it I found out that the spring on the throttle body was sticky and by spraying it with lubricant (WD-40 or something similar) and working it into the spring until could stretch and contract freely, I never had the problem again.

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