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1993 Ford Ranger Question: My Ranger has failed TX. emissions with high HC and NOX readings.

 

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LDC, 2.3L 4 Cylinder, Fort Worth, TX, August 10, 2014, 15:41
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Has new plugs, wires, coils, ICM, ECM, harmonic balancer pulley, new T-belt and crank sensor. Repaired/replaced vacuum lines. Smells a little rich at idle, at times, MPG is solid @ 24 mpg, mostly hiway 12 mile range to work.
need help pretty bad.

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