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Idle speed

Tiny
COREY H JENKINS
  • MEMBER
  • 1996 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 253,000 MILES
Finally got SUV back in one piece and no check engine light.
When you crank it, it idles up to 2000 rpm for six seconds and then levels out at 900 rpm.
When you put it in gear it idles up to 1100 rpm for three seconds and then levels out at 700 rpm.
After that when you go from park to drive, it goes from 900 in park to 700 in drive without the rev up.
But when you cut truck off and restart, it does it all over again.
Is this normal or do I still have a problem?
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Monday, June 26th, 2017 AT 2:16 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

This sounds like you have a vacuum leak, here is a guide to help you check for it to confirm.

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

Please let us know what you find.

Cheers, Ken
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Wednesday, June 28th, 2017 AT 6:21 PM
Tiny
COREY H JENKINS
  • MEMBER
  • 80 POSTS
Thanks found vacuum leak it's running fine now.
What is it supposed to idle at in park and in drive?
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Thursday, June 29th, 2017 AT 3:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Nice work, we are here to help, please use 2CarPros anytime. Where was the leak? It should relearn and end up at about 700 RPM

Cheers, Ken
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Friday, June 30th, 2017 AT 10:27 AM
Tiny
COREY H JENKINS
  • MEMBER
  • 80 POSTS
Is that 700 rpms in drive or park?
I get 2 different readings. 900 in park and 700 in drive
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Friday, June 30th, 2017 AT 10:40 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Yep, that sounds about right.
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Friday, June 30th, 2017 AT 11:27 AM

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