1991 SUBURBAN FAILING EMISSIONS

  • Tiny
  • sliane
  • 1991 Chevrolet Suburban

Dad's Suburabn will not pass Colorado emission test:
HC reading - 5.73 / Limit 4.00
CO reading 65.60 / Limit 25.00

Obvious CO way to high and running rich - he says there are no check engine lights for code triggers.

Any thoughts on what to investigate first?

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Sunday, December 10th, 2006 AT 9:34 AM

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  • Tiny
  • 82-454
  • Member

Put an oxygen sensor in it and tune it up. Maybe a catalytic converter. Ebay$50.

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Monday, December 11th, 2006 AT 8:36 PM

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