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As vehicle excelerates past 50 mph, engine.

Tiny
VRANCKX
  • MEMBER
  • 2008 CHEVROLET EQUINOX
  • 90,000 MILES
As vehicle excelerates past 50 mph, engine hesitates or hiccups. If accelerator is pushed firmly, the vehicle speeds up and all is fine. Recently changed spark plugs, transmission fluid, oil, oil filter and have used upgraded gas for 2 tanks now as this started after purchase of a half tank of gas from a reputable dealer. Any ideas?
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Wednesday, December 12th, 2012 AT 9:24 PM

2 Replies

Tiny
NYRA
  • MEMBER
  • 3 POSTS
I too have the same issues. Tried most of all the above. I have 50k on my 2008. My car hesitates over 40 mph, sometimes it is worse than others it is especially scary getting on the freeway. Please if anyone knows what this could be. Your help would be a life savor. I have spoke to the dealer and they keep telling me if it shows no codes there is nothing they can do.
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Monday, March 25th, 2013 AT 3:18 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Wont show any codes

have fuel pressure checked. Have cat converter checked for back pressure issues.

Have injectors cleaned professionally as additive do nothing

Roy
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Sunday, May 5th, 2013 AT 6:30 PM

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