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I would clean the throttle body first and the idle air control motor(IAC). Clean where the plate sits and on the back of it/them. You have to remove the IAC to clean it. Brake clean and a toothbrush works fine. If it still is high. Diagnostics need done for the IAC. Most times it is the IAC.
Have you tried to adjust the idle itself to bring it down? The adjustment should be right on the throttle body where the gas pedal is connected to the throttle body. There should be a screw that will allow you to adjust the idle up or down. If you loosen the screw it will take your idle down
air idle control valve, I dont belive you have a ideler set screw..I do belive the problem is what I have Listed..........Best of luck
How can I tell if I need a new air idle control valve? If your car has a rough idle or the idle cycles up and down, then chances are that you have a bad idle control valve. On modern vehicles, the purpose of the idle air control valve is to regulate your idle, and keep the idle smooth. The idle valve is controlled by the ECU or the computer, and when in gear the idle should be between 800 and 1000 rpm, and not in gear, between 700 and 900 rpm
Before you start check the status of your choke. One that is stuck on will cause a high idle. If the choke checks out, proceed to the following:
You should have what's called a 2 needle carburetor. A larger screw adjustment for idle, and a smaller for high speed.
Start by adjusting your low speed (idle) needle until you reach the desired idle. I prefer about 850rpms. Do this with the engine running and adequately warmed so that your adjustments are not thrown off by the automatic choke.
Next slowly open up the high speed needle. As you open it your idle speed will gradually increase. Adust it in 1/8 turn increments, pausing after each adjustment to allow the changes to take affect. Keep opening it until you stop increasing your rpms, then take it back 1/8 of a turn.
Next readjust your idle mixture screw so that your idle is back down to 850rpms.
idle is preset at the factory .. but some cars are equipped with an air conditioner adjuster . which will actually speed up the engine when you turn on the AC .. look at it when you start the AC and you will see it is adjustable to speed up the engine some ... thanks Jerry
I had the same problem. It was the idle air control valve. It sits on top of the intake just downstream from the throttle. There's a valve rod inside that gets worn over time and starts to stick. If that's what is causing your problem, you need to replace the unit.