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I've been having this problem for about a month and can't find out whats going on. I start my JDM D15 Sol and sometimes it idles at 1500, 2000 and today it was 2500 rpm. Even when it's warm it doesn't idle right and just stays revved. I have checked almost everything and its driving me insane. Sometimes it just idles perfectly like nothings wrong. I just dont know what to do next :no:
 

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There's so much more that you have missed trouble shooting it. How did you check the vacuum lines? Have you checked plugs, dist, cap, and rotor?
 

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Have you tried spraying carb cleaner all around the IM, throttle body, and where the IM meets the head?

I was having Idle issues and found out my TB gasket wasn't covering everything.

I'd be at 1,000 idle and when the engine was warm I'd get IACV issues.
 

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Similar problem and curious of suggestions
Car starts up, idles smooth but high at 1500rpm when warmed up.
But will idle at. 950rpm like it should normally with the AC on
 

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what idle motors/sensors do you have?


FITV? IACV?

look on throttlebody and on back of manifold.

if on back of manifold, it is the black cylinder looking thing with 2 wires.

If on throttlebody, generally it is a 3 wire, but likely you do NOT have this one.


manifold mounted IACV's like to get dirty and randomly STICK into position.
 

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what idle motors/sensors do you have?


FITV? IACV?

look on throttlebody and on back of manifold.

if on back of manifold, it is the black cylinder looking thing with 2 wires.

If on throttlebody, generally it is a 3 wire, but likely you do NOT have this one.


manifold mounted IACV's like to get dirty and randomly STICK into position.

This would be one of the first things I'd look at.
 
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