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

Tiny
HORTONO
  • MEMBER
  • 2008 GMC YUKON
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 179,203 MILES
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?
Friday, May 3rd, 2024 AT 5:08 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
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.

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Friday, May 3rd, 2024 AT 12:45 PM

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