Mechanics

FAILING EMISSIONS

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?
Avatar
Sliane
December 10, 2006.




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

Tiny
82-454
Dec 11, 2006.


AD