Idle is too high?

1999 DODGE RAM
128,000 MILES • 5.2L • V8 • 2WD • AUTOMATIC
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ALBERT DIAZ
  • MEMBER
  • 1 POST
Start truck warm up, drive and Idle does not come down, runs great it just Idles too high.
Sep 15, 2023 at 12:48 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

The first thing I would recommend is to clean the throttle body bore. There could be dirt or corrosion preventing the throttle plate from fully closing.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/throttle-actuator-service

Also, there is an idle air control valve (IAC) mounted on the throttle body. Its function is to control the idle speed. The pintel on the IAC may not be working properly and allowing too much air to enter the engine. I attached a pic below of its location.

You also should remove the IAC and inspect/service it.

Here is a link that explains how to do it.:

https://www.2carpros.com/articles/idle-air-control-valve-service

Also, take a look through this link. You may find it helpful.

https://www.2carpros.com/articles/engine-idles-too-high

Let me know what you find or if you have questions.

Take care,

Joe

See pic below.
Sep 15, 2023 at 3:46 PM
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