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2001 GMC Sierra ruff at idle

Tiny
HAROLDBYRD
  • MEMBER
  • 2001 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
When the engine is idling it misses ( runs ruff).
Saturday, February 7th, 2015 AT 3:03 AM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
First check the computer for stored codes.

How does it run when " off idle"?
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Saturday, February 7th, 2015 AT 6:26 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like you have low compression in one or more of the cylinders, lets do a compression test here is how in the guide below.

https://www.2carpros.com/articles/how-to-test-engine-compression

If the compression is okay I would roll in a new set of spark plugs.

Spark Plug Type .................... Denso: PTJ16R15

Please go over this guide and get back to us.
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Wednesday, July 17th, 2024 AT 5:53 PM

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