Mechanics

ENGINE RUNS RICH

2002 Ford Ranger

Engine Performance problem
2002 Ford Ranger 6 cyl Two Wheel Drive Automatic 12000 miles

I have replaced 3 O2 sensors and the engine doesn't seem to run rich at rpm's below 3000. At 3000 the engine hesitates and begins to run rich with black smoke coming from the exaust.
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Alecat
April 15, 2008.



Check the engine coolant temp sensor, Fuel pressure, with particular attention to the pressure regulator...or cloggeg return line.
http://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.

Merlin2021
Apr 15, 2008.