Throttle Body Cleaning

Cleaning the throttle body on a Jeep Cherokee.

One of the most common questions I see on Yahoo Answers is about a Jeep that won’t idle. They complain that it dies at traffic lights or won’t start.

Often the cause is simply a sticking idle air control valve. This valve mounts to the side of the throttle body and allows a small amount of air to bypass the closed throttle plate to regulate the idle speed. The valve is actuated by a stepper motor controlled by the ECU.

I don;t know why but using fuels high in ethanol seems to make this gum up. It makes no sense to me since the fuel does not pass through the throttle body – only air. However, I have noticed that on many of the Jeeps I have serviced, high ethanol equals a sticking throttle body.

Cleaning it is simple. Remove the rubber air inlet tube. Locate the slots int he back of the throttle body. Spray throttle body cleaner in the slots. Do it with he engine running and you can make the valve cycle while spraying the cleaner in. This will help get it unstuck.

Here is a video of how it is done: