Brian Sprague
Member
Working on 01 Ford explorer sport trac with 4.0 vin E
when starting below 30 degrees Farenheit the vehicle will run rough and stall.
The problem only lasts a couple minutes and straightens out. Seems like the problem starts when the vehicle idle speed is coming down after initial start. No codes were in the system until recently. The only code was bank 2 sensor 1 oxygen sensor indicate lean. How could the O2 sensor create a problem at cold start when in open loop. Tried throwing some parts at it with no luck. Tried MAF and DPFE sensors. Fuel pressure was extremely high and replacement fuel pump brought pressure to spec. Vehicle still exibits cold run problem.
NEED SOME HELP FIGURING THIS ON OUT!!!!!
when starting below 30 degrees Farenheit the vehicle will run rough and stall.
The problem only lasts a couple minutes and straightens out. Seems like the problem starts when the vehicle idle speed is coming down after initial start. No codes were in the system until recently. The only code was bank 2 sensor 1 oxygen sensor indicate lean. How could the O2 sensor create a problem at cold start when in open loop. Tried throwing some parts at it with no luck. Tried MAF and DPFE sensors. Fuel pressure was extremely high and replacement fuel pump brought pressure to spec. Vehicle still exibits cold run problem.
NEED SOME HELP FIGURING THIS ON OUT!!!!!