1992 Ford F150 bad nox

1992 FORD F-150
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MCREB
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Engine Mechanical problem
1992 Ford F150 6 cyl Two Wheel Drive Automatic

what would cause high Nox when all vacum lines are in new condition and the egr valve workin properlly. everything else passed with real low numbers on the state inspection in texas
Feb 1, 2010 at 9:56 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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