1992 Ford Explorer Emission Fail

1992 FORD EXPLORER
18,000 MILES • 6 CYL • 4WD • AUTOMATIC
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BEEINCH
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My vehicle fail emission due to high NOX I just got a new CAT and I don't think it has a EGR. Everything else was burning clean. What else could it be?
Apr 2, 2008 at 4:28 PM
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2CARPRO JACK
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Most Fords have EGR, I would double check that. If so, manually pull the valve on and th eengine should stumble hard, if not the passages are plugged up.Otherwise, try smogging it when the engine is cooler, NOX is ehxaust gas temp
Apr 2, 2008 at 4:31 PM