Transmission not shifting properly?

1996 CHEVROLET LUMINA
185,000 MILES • 3.1L • V6 • 2WD • AUTOMATIC
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SAMGREW
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car made sound like fan blades hitting something while accelerating. very slowly picked up speed but will not shift gears unless i let off accelerator.
Apr 7, 2025 at 8:30 PM
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STRAILER
  • ✓ASE Certified Mechanic
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Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response. We need to hear the noise, so we know which direction to go to help you fix the car. It takes time to upload so please be patient.
Apr 8, 2025 at 10:51 AM
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SAMGREW
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  • 59 POSTS
Since I changed the fluid and filtered it no longer makes the noise. It accelerates very slowly and will not shift without letting off accelerator.
Apr 9, 2025 at 12:14 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
This can happen because of a clogged catalytic converter. Do you have any trouble codes?

Please go over these guides to help us see what's going on:

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

and

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

Please go over these guides and get back to us.
Apr 11, 2025 at 9:07 AM
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