Hesitates to accelerate and there is black smoke when I floor it?

2008 GMC YUKON
179,203 MILES • 5.7L • V8 • 2WD • AUTOMATIC
Avatar
HORTONO
  • MEMBER
  • 1 POST
Don't want to take the gas all at once when at a stop light or sign seem like it wants to cut off and it ride rough. What do you think the problem could be?
May 2, 2024 at 10:08 PM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,897 POSTS
  • ASE Certified Mechanic
Yep, this happens when one of the catalytic converters goes bad, but to be sure please go over this guide to confirm the issue:

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

This car does not have a fuel filter FYI. Here is a video of the catalytic converters being changed out to help you see what needs to be done if they fail the test.


https://youtu.be/CORe9JyrexI?si=ArkojwvJERJxK5LG

Please go over these guides and get back to us.


May 3, 2024 at 5:45 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.