2003 Chevy Tahoe Idle drops below 500 RPM

ELEDESMA

MEMBER
2003 CHEVROLET TAHOE
V8
2WD
AUTOMATIC
83,000 MILES

I am having a problem with the idle of my 2003 Chevy Tahoe. Its a V8 5.3 L. When I start the Tahoe and the motor is on drive it idles at 500 RPM but it will drop to about 200-300 RPM's but never does it turn off. At this point when the idle drops below the 500 RPM mark the AC will blow hot air. So what I do is that I rev up the RPM's up to 1000 and the AC will began to work again. When the motor is on drive everything is ok. What can I do to fix the idle problem. Thanks

Saturday, July 5th, 2008 AT 7:00 AM

4 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

Try cleaning the Idle Air Control Motor. Also clean out around the butterfly in the throttle bore with carb cleaner and a rag. This should help stabilize the idle. That truck shoul dbe "drive by wire" ie, no throttle cable, if so then it doesnt have an idle air control valve which means you may have to replace the throttle bore to fix the problem, but try cleaning it first

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Saturday, July 5th, 2008 AT 8:13 AM

JYOUNT21

MEMBER
2 POSTS

Hey Jack. Where can I locate this motor you are referencing? I am having the exact same problem.

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Wednesday, July 9th, 2008 AT 10:58 AM

2CARPRO JACK

MECHANIC
11,533 POSTS

If your truck doesnt have a throttle cable, you dont have one. If it has a cable it is located on the throttle bore. Clean out inside the throttle bore too, this will also help with the low idle

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Wednesday, July 9th, 2008 AT 11:37 AM

JYOUNT21