Rough idle vibrations while accelerating

2005 CHEVROLET TRAILBLAZER
135,000 MILES • V6 • 2WD • AUTOMATIC
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CORY SHANE
  • MEMBER
  • 4 POSTS
Truck was in park running fine then shut off randomly. Started it back up and it now idles low and has a descent amount of vibrations while idling and accelerating but not while coasting.
Dec 4, 2020 at 7:39 AM
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DANNY L
  • ✓ASE Certified Mechanic
  • 5,648 POSTS
  • ASE Certified Mechanic
Hello, I'm Danny.

I can think of 2 things the might be causing these troubles. First for the poor idling that could be caused by a faulty or dirty idle air control valve. Here are a few tutorials for you to view about this:

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

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

The second issue for poor acceleration might be a weak or failing fuel pump not supplying sufficient fuel pressure. Here is a tutorial for testing fuel pressure:

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

The proper fuel pressure for your vehicle should be key on - engine off between 50-57 PSI. Hope this helps and thanks for using 2CarPros.
Dec 4, 2020 at 4:11 PM
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