Question about 2000 Honda Civic

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Surging idle speed

After warming up for a few minutes at a nice steady idle, the idle speed surges up and down. It seems as if it wants to drop down to a warm idle speed, but then jumps up, and continues the cycle. Fault code P0505.
Is it the IACV?

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  • vstarmachgoa Oct 04, 2008

    i have a idle surge , when i first start the car , no throttle it doesnt surge as soon as i touch the throttle it starts to surge, i have 21 in of vac, has or had a p0505 code, replaced the iacv still has the problem tps works and shows that it is working but when i unplug the map sensor there is no idle surge, now is this because the ecu puts the car in a open loop mode and if i change the map the prob will still be there?



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Check your high idle valve may need to be replaced.situated at the side of throttle body.

good luck

Posted on Jul 26, 2008


It sounds like a temp switch problem.

Posted on Jul 18, 2008


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