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To fix high idle problem on a 1996 VS Commodore, first locate the idle air control valve. Unscrew and unplug electrical connector running to the valve. Turn the valve over and clean the sensor for debris.
When an idle control value is clogged the idling speed of your vehicle will change. The car may also stall when you turn on the air conditioning.
You can adjust the idle by removing the plastic splash guard right at the throttle cable and just turn the screw to increase or decrease idle.
The A/C compressor puts a load on the engine and this should cause the Air Idle Control Valve to increase RPMs. Check the valve.
If the IAC was bad the car wouldn't run at idle or it would die when a load was put upon it.
first step check all the fuses under the steering column left side panel (LH drive) if the fuses are ok (there is one fuse that supply power to the idle valve and some valve for emission) check the power supply goes to the idle valve, if you dont have a tester turn on the ignition swicth then unplug and plug the connector for the idle valve, if you hear it clicking your idle vale is good. Second step take it to the carburetor expert coz several mechanics hates carburetor nowadays.
your idle air control valve need to replace parts $200 labor $150 or clean it with carburetor spray if you're lucky that might solve the problem i clean my idle air control valve it help little maybe i didn't clean it up good my idle go up and down pretty high and then after i clean it sound much better but it still there idle go up and down slowly now the best way just buy a new idle air control valve engine light turn on hope its not o2sensor
The IAC valve is on the back of the throttle body. It has 2 bolts on the back of it and a black cylinder on one end. The idle adjuster screw is on the front of the intake and has a couple cables running to it. Let your car fully warm up and turn the screw to adjust the idle.
To test idle contol on a1997 F250, ensure that the "check engine" light is on, disconnect the IAC valve, and turn the ignition, you can then turn off the ignition and reconnect the IAC valve.
There is no adjustments to be made as the computer does it all. If you were to increase the idle speed then in turn you have changed the throttle positioner and that will truly mess up the party.
the idle air control valve most the time
sounds like a possible bad idle control valve. is your check engine light on? if so get it scanned for free at autozone