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2003 Buick Rendezvous transmission

Tiny
MPLAIN
  • MEMBER
  • 2003 BUICK RENDEZVOUS
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 178,000 MILES
Between 3rd and 4th gear it don't want to shift but does if you let up on the gas.
Sunday, February 15th, 2015 AT 1:06 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fluid level and scan for codes it may be a valve body problem or clutch problem.
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Sunday, February 15th, 2015 AT 3:29 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,345 POSTS
To me it sounds like the catalytic converter might be bad and starting to clog up, when this happens the engine vacuum is lower and it makes the computer think you are going up a hill. Here is a guide to help test the cat and the cat location in the images below.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Also, let's check for codes

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the images (below). Please let us know what happens.
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Thursday, June 27th, 2024 AT 6:31 PM

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