I just recentley did a rebuild on my jdm h22 and finally got it running but it has a weird idle problem. When I'm say coming to a stop and push in the clutch the engine idles at about 2000rpm and will not idle normal untill the car comes to a complete stop. I have check engine codes

Knock sensor- got a new one and installed
EGR- took off the block off plate and got a gasket, reinstalled new one.
o2 sensor- ordered a new one will be here tomarrow.

does anyone have any idea what would cause this? here is my setup

1994 Prelude JDM H22
1/h/e/fuel rail/fuel pump/ chiped P13 w ericks racing chip.

any help would be greatly appreciated.

 

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Idle Air Control Valve ... Fast Idle... A Vaccuum Leak...

Pull off a vaccuum line and if the idle changes its most likely not a vaccuum leak.

Take you IAC off and clean it out with throttle plate or brake cleaner. lube it up with some Open Shut or PB blaster and re-install it. You can also jump it to your battery and see if its moving. But chances are its having a hard time keeping up because of unmetered air coming into your manifold.


If your chipped ECU or fuel mods are new to this engine, they may be the culprit as well...