More on high HC's.

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  #1  
Old 08-03-03, 02:11 PM
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More on high HC's.

I read all the suggestions for the high hc's on post. My 91 Chev. 5.7 flunked also by .08. I wondered if it could also be the catalytic conv. since i have 144K miles on it?
 
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Old 08-03-03, 04:00 PM
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Old 08-04-03, 03:21 PM
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Your era truck had emission failures that could only be fixed with cat replacement.But check your basics first.A new cat can hide alot of evil emission problems.I would always replace an O2 sensor at the same time but thats my opinion.Slow O2 sensors cause a great amount of converter damage.
 
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Old 08-04-03, 03:30 PM
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Your era truck had emission failures that could only be fixed with cat replacement.But check your basics first.A new cat can hide alot of evil emission problems.I would always replace an O2 sensor at the same time but thats my opinion.Slow O2 sensors cause a great amount of converter damage.
 
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