Question about 1993 Chevrolet Suburban

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CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.

WE FAILED THE SMOG TEST BECAUSE OF HIGH NOX. HAS NEVER FAILED BEFORE. 1993 CHEVY SUBURBAN 1500 4X4. COMPLETELY STOCK. WHAT SHOULD I CHECK FIRST.

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  • Anonymous Dec 12, 2008

    my 90 suburban has high nox how do i fix it

  • ddoggies Dec 23, 2008

    I have a 95 pu and I replaced the converter as I was told that this was the problem and the NOx got worse went from 1400 to 1700 the truck is not running lean is this the EGR valve?

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Nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Posted on Oct 24, 2008

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