High idle

JUGGALO45

MEMBER
2004 SATURN L300
3.0L
6 CYL
105,000 MILES

Hi guys me again. You did such a good job last time with my crank no start that drove me crazy being a faulty relay. Well, car runs great ever since. But now it has a high idle (1,500 rpm's) until it is in gear (900) Any ideas?

Thursday, February 13th, 2020 AT 7:37 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

The most common causes of a high idle include an engine vacuum leak, fuel pressure issues, or a faulty or dirty idle air control valve. With that, here are links that explain how to check for a leak and fuel pressure. Also, the last two links explain how to service or replace an idle air control valve.

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To start, I have a link that explains about high idle issues.

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

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

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As far as the IAC valve, it is located on the throttle body. Do these checks and let me know what you find.

Take care,
Joe