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RPM surging

Tiny
PP270
  • MEMBER
  • 2003 PONTIAC MONTANA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
The rpm's surge when accelerating fast between first and second and second and third gears. If you accelerate slow there is no issue. Any thoughts as to the problem?
Wednesday, January 16th, 2019 AT 7:39 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I would suspect a possible clogged catalytic converter. The back pressure needs to be tested to verify if it is the issue.

https://www.2carpros.com/articles/engine-surges

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

Roy
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Wednesday, January 16th, 2019 AT 9:25 AM

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