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Originally Posted by sLip techniques
Im stumped as to why my idle is so damn high (around 1200-1400). I recently replaced my intake manifold gaskets,every single vacuum hose (even the ones behind the valve cover and the ones leading to the carbon canister), and i have correct timing. What other things can cause high idle? i have a stock ka24e.
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With the engine off, clean out your AIV/IAV valve with carb cleaner. Once you clean the AIV/IAV valve, then disconnect your throttle position sensor subharness...should be three wires, black, white, green..???. Go ahead & start your car. By disconnecting the TPS subharness, your idle should either drop or rev higher. Using the phillips type screwhead on your IAV valve, (the phillips type screwhead is visible on the passengerside of the motor towards the rear firewall - should be right by the coolant lines that run into your firewall / passenger compartment - adjust your idle till you get it to 650 rpm +/- 50 RPM. Turn your motor off & reconnect your TPS subharness. Once you reconnect your TPS subharness, re-start your car. With the engine running again, your idle should reset to 700 rpm.
Anyhow, hope this helps..
ID