1998 Chevy Tahoe p0420 code

1998 CHEVROLET TAHOE
146,000 MILES • V8 • 4WD • AUTOMATIC
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HUPPBEAR
  • MEMBER
  • 2 POSTS
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.
Feb 27, 2010 at 1:30 AM
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MERLIN2021
  • ✓Experienced 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...
Feb 27, 2010 at 1:34 AM
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