Question about 1993 Isuzu Trooper

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I failed the NOX portion of the emissions test app.standard is 4.00 i ran a 6.32 . I had a cat conv. put on two years ago. I just noticed my temp. gauge not moving at all could this be the problem? Do you think it could make it go up that much.

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Engine not at operating temperature--Cold Converter,Thermostat Stuck Open
Malfunctioning Mixture Control--O2 Sensor reading lean all the time.
Coolant Temp Sensor high resistance or open circuit
Bad Converter

EGR Valve--most likely cause

Posted on Nov 11, 2010

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