High Idle?

1998 FORD RANGER
150,000 MILES • 2.5L • 4 CYL • 2WD • MANUAL
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RANDY1955
  • MEMBER
  • 71 POSTS
So, a lot of times this truck idles really high, and it is a smooth idle and it will come down by itself but not right away. So, the only thing I found to get down is the clutch let it out and the idle will come down it is not the cable. Do you think it has something to do with the clutch? Because that is how you can slow the idle down. Thank you
Sep 15, 2023 at 9:30 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

The RPMs are lowered because there is a small load being placed on the engine. However, that shouldn't be required, and I don't feel it is clutch-related.

The idle speed is controlled by a component called an Idle Air Control actuator (IAC). What I would recommend is to service it. There could be carbon or dirt in the air passage or on the pintle that is causing this.

The IAC is located on the throttle body. See pics below. Remove and clean it.

Here is a link that explains how it's done:

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

Try this first and let me know the results.

Take care,

Joe

See pics below.
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Sep 17, 2023 at 7:37 AM
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