Question about 2003 Honda Civic

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I have a 2003 Civic with a 1.7L Vtech. When temperature outside is above 90 degrees or more and sitting in traffic the engine idles at around 1500-2500 rpm while in gear. Coolant temp doesn't change from normal operating temp, no codes or MIL's. Any one have any ideas?

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  • sdanagnost Aug 26, 2010

    The car runs fine when its warm out. The only time is acts up is when its very hot outside. After is starts to act up, and I get to do some extended drving everything goes back to normal. This problem doesn't happen immediatly when stopped in traffic is take awhile of sitting in stopped traffic for it occur.

  • sdanagnost Aug 27, 2010

    Any other ideas.

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It is odd that it would do this with no codes. The things I think of here is to inspect anywhere that a vacuum hoses lies. This really sounds like a broken/burned vacuum hose. Usually it would trigger a lean code/s. Inspect the entire engine/compartment and let me know what you see?

Posted on Aug 27, 2010

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Hi. Try to adjust the idling of your car. If same result after adjusting the idling. There could be a problem with the cervo kit.

Posted on Aug 26, 2010

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Most likely causes are dirty IAC and throttle body and/or vacuum leak

First... go to the parts store and look for throttle body cleaner
then use this with a lint free cloth to clean out the inside of the throttle body and IAC

if this does not resolve the concern then you will need a professional scan tool, NOT a code reader, in order to monitor the computers commanded % of IAC if low = vacuum leak
if high replace the IAC

Posted on Aug 26, 2010

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