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2005 GMC Envoy surging

Tiny
DOMSTECK
  • MEMBER
  • 2005 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 78,000 MILES
My vehicle surges while normal driving operations. So if I am going around 60mph I get to feel this annoying up and down acceleration, seems to be worse when my tank is about a 1/4 full. I have had it in the shop twice and had the computer flased as well as the throttle body changed out. Not sure where to go from here.
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Friday, March 26th, 2010 AT 1:31 PM

2 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
The first thing you want to do is check the fuel pressure here is a guide to help you see if you have a weak fuel pump which is normal on these cars. Good fuel pressure 55-62 psi.

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

and if bad here is what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Check out the diagrams (Below)

Please let us know what you find.

Cheers

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Friday, March 26th, 2010 AT 2:38 PM
Tiny
DOMSTECK
  • MEMBER
  • 1 POST
Thank you it was the fuel pump I got one on Amazon for $210.00 Ac Delco
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Sunday, March 28th, 2010 AT 2:08 PM

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