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2002 Chevy Trailblazer

Tiny
MARKJR1
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 63,000 MILES
I recently had my alternator replaced. Since then, when I am driving on the highway, specifically doing between 70-80 mph, the engine revs up (the tac jumps from around 2,000 up to 3,000-4,000). This only happens when I am at that speed and not accelerating or decelerating, only when I am keeping enough RPM to keep my speed maintained. To me, it almost feels like the transmission is shifting down and it then revs up. As soon as I either let off the gas or press on the gas to speed up, it revs back down.
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Tuesday, October 27th, 2009 AT 1:07 PM

3 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
I dont thing its an alternator problem but I would check the tranny fluids and also check for TCM codes
do you have check engine light on?
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Tuesday, October 27th, 2009 AT 10:36 PM
Tiny
MARKJR1
  • MEMBER
  • 2 POSTS
The TCM isn't showing any codes. However, we've never had it connected while driving when the problem actually happens. Trans fluid is good, no check engine light is on. A buddy of mine mentioned something about it could be a fuel filter or mixture problem? Would that make sense if it only happens at certain speeds? Thanks for the help!
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Wednesday, October 28th, 2009 AT 7:58 AM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
I dont think its a fuel filter
replacing the fuel filter never a bad idea
I doubt its going to help in your problem
hook scanner and take it for a spin
as you check Data and tranny shifting
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Wednesday, October 28th, 2009 AT 7:32 PM

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