Question about 1992 Dodge Colt
O2 sensor helped me but not enough to pass. Loosen your distributor bolts, one on each side, turn your distributor counter clock wise about 1/4 inch and tighten bolts. This will raise your CO but should reduce the NOX. When the vehicle is passed, undo the changes.
Posted on Nov 16, 2008
Check your EGR valve for blocked ports and proper operation. The EGR is what lowers your NOx emissions.
Posted on Oct 07, 2008
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Posted on Jan 02, 2017
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