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1989 Chevy Astro high idle

Tiny
HAGGEN 2
  • MEMBER
  • 1989 CHEVROLET ASTRO
Engine Mechanical problem
1989 Chevy Astro 6 cyl Two Wheel Drive Automatic

hi. My astro has high idle speed RPM ca.2000, how can I reduce speed.
regards ernst
Wednesday, June 9th, 2010 AT 12:10 PM

4 Replies

Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
Possibilities, the throttle is stuck open-- the iac has a problem-- vacuum leak-- other. Check you mil codes, see if anything shows-up.
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Wednesday, June 9th, 2010 AT 12:42 PM
Tiny
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Wednesday, June 9th, 2010 AT 1:27 PM
Tiny
HAGGEN 2
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The IAC is new and I have tested codes they are ok.
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Wednesday, June 9th, 2010 AT 1:31 PM
Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
Are the throttle-body passages clean? If everything else checks ok, if it isn't a vacuum leak, I don't know. I may be barking up the wrong tree, I found this info?


https://www.2carpros.com/forum/automotive_pictures/512072_idle_speed_error_1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/512072_idle_speed_error_2_1.jpg

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Wednesday, June 9th, 2010 AT 1:49 PM

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