Question about 1992 Chevrolet Lumina

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1991 lumina 3.1 mpfi

Wont idle blows black smoke went from 30 mpg hwy to 14 mpg

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ONE OF 2 POSSIBILITY'S O2 SENSOR #1 OR CLOGGED CATALYTIC CONVERTER

Posted on Nov 27, 2008

  • Scottie Payne
    Scottie Payne Apr 25, 2012

    There is more than two possibilities because i am dealing with the same issue and I have covered about 10-15 possibilities and yet to find the problem. Black smoke, rough idle, air/fuel ratio drops from 14.7 (engine is running smooth) to about 9.9 (engine runs rough, black smoke, smell of gas). It has to be something electrical, an open loop, or something. Cleaned 02 sensor, checked wires plugs, cleaned egr valve, checked TPS, Temp sensor, IAC, MAP, MAF, and a partridge in a pair tree. I own a car business and under normal circumstances, I would have drove this car off a cliff a long time ago $$$, but to solve the mystery has now become a quest!! Once I do, I may still drive it off a cliff, but not before I figure this rabbid puppy out!!

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