I have an astro with a p 420 catylitic converter low effitiency

145,000 MILES
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HORSESHOE
  • MEMBER
  • 7 POSTS
while driving engine slightly hasitates seems to indicate missfire
Nov 2, 2011 at 12:30 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
cat has failed most likely from a missfire you have. the unburned fuel is what kills the converter.
i suggest you resolve the missfires and you will still most likely have to replace the cat as well.

Roy
Nov 2, 2011 at 12:33 PM
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