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Impala accelleration problems around 40-50 mph

Tiny
WHITEBH
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
Impala 2005 starts acting up when you reach 40-50 mph. Rpms fluter up and down gas pedal to. If you slow down or speed up it goes own. Check engine light code says coolant sensor or thermostat.I replaced thermostat and light went off.
Saturday, May 7th, 2011 AT 6:36 PM

6 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Recheck for codes. Maybe have EGR problem? MAF sensor dirty?
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Saturday, May 7th, 2011 AT 6:47 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
What was the exact code number being stored?
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Saturday, May 7th, 2011 AT 7:28 PM
Tiny
WHITEBH
  • MEMBER
  • 4 POSTS
Po116
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Saturday, May 7th, 2011 AT 7:39 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You have a known problem with the coolant temp sensor. It's a pretty generic code so it's not telling you specifically what the issue is but it controls fuel mixture so it's very important to get to the bottom of the problem. You may need a scan tool to determine what the computer is seeing for temp that is causing it to set the code.
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Saturday, May 7th, 2011 AT 7:44 PM
Tiny
WHITEBH
  • MEMBER
  • 4 POSTS
Sorry that was wrong code.I have misplaced the code number. The 3 possible causes where low coolant, coolant temp sensor, thermostat. How can I have it rechecked if check engine light went out?
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Saturday, May 7th, 2011 AT 7:46 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
As long as it wasn't deleted, it will still be there.
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Saturday, May 7th, 2011 AT 7:48 PM

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