Engine Performance problem
2003 Ford Ranger 6 cyl Two Wheel Drive Automatic 108000 miles
NO obd 2 codes, runs great till warm up (closed loop), then misfires up hill, under load or just revving engine. Have new coil pack, wires, plugs. Fuel pressure is 61 psi (normal). With master obd 2 computer, shows mixture stays lean above 3200 rpm (no computer correction). Replaced the front two oxygen sensors but not the back two. Also intermittent rough idle. Any Ideas?
Tuesday, April 8th, 2008 AT 8:42 AM