1986 Ford Ranger

Engine Performance problem
1986 Ford Ranger 4 cyl Two Wheel Drive Manual 100000 miles

wont idle, runs rich
September 8, 2009.

Running rich: Could be caused by the following a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.

Sep 8, 2009.