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Friday, January 21, 2011

IAC (Idle Air Control)

The IAC (idle air control) is a little motor that regulates the air that is coming into the car. For example, the IAC is used when the car is in neutral, parking position or when you come to a stop. The IAC controls the rpm in your car by open or closing its valve, and it is controlled by the computer. The IAC valve over time gets dirty and will cause your car to run poorly. Possible symptoms of a bad IAC is irregular rpms, car stalling, and it will cause you to waste more gas than necessary. There are two ways to service the IAC, either clean it or replace it(if cleaning it doesn't work). The IAC is located outside the throttle  body.

IAC attached to the throttle body.

Cleaning the IAC is very simple job to do.
1. Disconnect the negative battery terminal.
2. Remove the air intake from the throttle body.
3. Disconnect the wire harness from the IAC.
4. Remove the IAC with a screwdriver.
5. Clean the metal tip of the IAC with a carb cleaner.
6. To re-assemble it follow the instructions in reverse.

If cleaning the IAC does not work, you may have a faulty IAC and you will need to replace it. If you had a dirty IAC and you've cleaned it, you will notice a difference in your car, it will run smoothly and save you money each time you come to a standstill! Having a clean IAC will help you maintain your cars mpg and will keep your car at its optimum, while a dirty IAC will decrease your gas mileage. If you liked what you read, please donate with a couple clicks on my ads and it will help me add valuable content to my site. Whats your cars idle speed?


  1. Idle speed is 2rpm or right under 2 on a 1997 Saturn SL1

  2. My cars idle speed after i replaced the iac is now over 9999999

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