Vehicle will not accelerate?

Tiny
SCXJ
  • MEMBER
  • 1996 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
The engine idles fine and will rev while neutral. When shifted into drive the vehicle will increase speed to about 25 MPH and then won't go much faster. I checked the fuel pressure, and it was about 45 PSI. Replaced both O2 sensors and the output shaft speed sensor. No OBD codes.
Thanks
Sunday, May 7th, 2023 AT 2:36 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,135 POSTS
This sounds like you have a clogged catalytic converter but to be sure this guide can help us confirm the failure and I have included instructions on how to change the cat out in case you need it.

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

And this may help as well:

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

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Monday, May 8th, 2023 AT 11:23 AM
Tiny
SCXJ
  • MEMBER
  • 9 POSTS
Okay, Ken, will do. Thanks for the input.
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Monday, May 8th, 2023 AT 6:01 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,135 POSTS
Please let us know what you find.
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+1
Wednesday, May 10th, 2023 AT 10:47 AM
Tiny
SCXJ
  • MEMBER
  • 9 POSTS
Ken,

Sorry I took so long to reply but you were correct, the converter was bad, running fine now. Thanks for the advice.
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Saturday, June 24th, 2023 AT 10:21 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,135 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Sunday, June 25th, 2023 AT 11:22 AM

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