Question about 1991 GMC Sonoma

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My 1991 Sonoma idals low and will not pass emissons

My 1991 Sonoma idals really low and will not pass Hamilton County's Emissions Testing. It has a 4.3 fuel injected v-6, and has almost 190,00 miles on the engine. What would cause this problem?

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You may have a worn out O2 sensor or catalytic converter. Maybe time for a tune-up?? Is the check engine light on?

Posted on May 29, 2010

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I have a 1991 s15 sonoma with an erratic idle and the ecu shows no codes at this time.Ive replaced or ruled out most of the emissions system and I wonder if the problem might be ecu related.


its possible that the old pump and filter were about shot so the carhad been tuned to work with them, now its got true fuel coming through try changing the mixture setting.
Good Luck Davelee

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