1990 Ford F-150 Repair Question
Topics covered: Sensor, Black smoke, Ignition switch.
Mileage: 200,900 miles.
Mileage: 200,900 miles.
Asked on July 28, 2011
Will not idle. Black smoke from exhaust.
1990 Ford F-150 coding for TP, ECT, EGR, MAP. Replace EGR and EGR sensor, ECT, and IAC. Will not idle. Black smoke. Could this be oxygen sensor?
Asked by rscunha82Answer
Replied on July 28, 2011
To have that many codes, look for something in common. That means the 5.0 volt supply to all of those sensors. Suspect a broken wire or stretched pin in a connector. The easiest is probably the TPS. Back-probe through the connector. One wire must have 5.0 volts. If it's missing, follow that wire back to look for a break in the circuit.
Also, with the ignition switch off, measure the resistance of the 5.0 volt feed wire to ground to see if it's shorted.