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1998 Chevy Tahoe P0420 code

Tiny
HUPPBEAR
  • MEMBER
  • 1998 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
I have the running problem resolved. We had to put a brand new distributor in it. Now it is showing a p0420 code. But I have had my cataylt converter checked and it is good. Some times it will act like it is losing power and when you make a right hand turn it makes a awful noise and you give it gas and it does not want to go. Please help me.
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Saturday, February 27th, 2010 AT 9:30 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
What kind of noise? A rattle? Could be the cat broke up insde and pieces are trapped in the exhaust pipes or muffler. Install a vaccuum gauge in an intake manifold port, increase engine rpm to 2000, if the vacuum gauge starts to drop, there is a restriction in the exhaust system.
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Saturday, February 27th, 2010 AT 9:34 AM

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