Slow acceleration

1991 CADILLAC FLEETWOOD
102,784 MILES • 4.9L • V8 • 2WD • AUTOMATIC
Avatar
EVERETT NORMAN
  • MEMBER
  • 1 POST
when taking off , the transmission,under ride the engine.
Oct 28, 2019 at 11:01 AM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hello,

It sounds like you may have a clogged catalytic converter. To be sure here is a guide to help confirm the issue:

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

This guide can help as well:

https://www.2carpros.com/articles/engine-has-low-power-output

Please run down these guides and report back.
Oct 29, 2019 at 11:09 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.