will continually idle high in gear

1998 FORD ESCORT

99,000 MILES • 4 CYL • FWD • AUTOMATIC

DOUBLE_D_FINELINE

MEMBER
1 POST

when i start the car it runs smooth as it warms up and im driving around town it will continually idle high in gear and in park and neutral. causing me to keep foot on brake at all times how can i adjust this and is it the throttle position sensor?

Oct 12, 2009 at 6:14 AM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

This could be due to a faulty idle air control valve (IAC).
The IAC controls the engine speed during idle by letting in specific amount of air. Over time the valve can become weak or get dirty and become stuck open or allow more air thru. That will make the engine idle higher.

The IAC can be serviced by cleaning it. Many times, which will improve the idle quality.

Take a look at this helpful guide:

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

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.

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