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Why does my truck not start after removing the catalytic converter?

Tiny
MATT BLONDKE
  • MEMBER
  • 2018 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
My catalytic converter was so clogged up. There was almost nothing coming out of the tailpipe. I cut off the catalytic converter and now it won’t start. I’ve gotten it to start twice and was able to drive it around. And of course, was very loud. I stopped at home and now I can’t get it started again. Does anyone know why?
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Monday, June 5th, 2023 AT 6:10 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,779 POSTS
Hi,

What was done with the oxygen sensors? They could be causing the powertrain control module (PCM) to run the fuel mixture off far enough to prevent it from starting.

Also, if you have a scan tool, see if there are any diagnostic trouble codes stored.

Let me know.

Joe
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Monday, June 5th, 2023 AT 9:31 PM

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