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Another Ford MAF Sensor Problem

Q. Hello, I have a 1994 Ford Bronco with a 302 that was just rebuilt and an E40D transmission that also was done about a month earlier. There is 160,000 miles on the truck and actually about 15,000 miles on the engine and transmission. The truck runs great around town and down the back roads, but lately I have had problems with lack of power, jerking and severe spark-knocking while attempting to climb hills while under a load.

Another Ford MAF Sensor Problem

This happens the most while driving at around 55-65 and starting up a hill in OD. The truck shifts down perfectly and keeps shifting down until there is a large loss of power and I have to really kick it down. The vehicle does respond to being down shifted and the pings go away. Sometimes it is hard to get it to downshift to the lowest gears. When it does shift though the speed increase and also the tach moves up.

I don't think the transmission is the problem, but just a symptom. I have replaced all of the plugs, wires, cap, rotor, coil, fuel filter, air filter, checked fuel pressure, checked base timing and advance.

The only thing that I am really interested about is the Mass Air Flow (MAF) sensor. I have heard some different stories about them and I would like your opinion. I have a Snap-On scanner if that might make it easier to help me test it. I take very good care of my truck.


A. I think the problem could very well be the MAF sensor. Here are others with the same problem, the TSB outline the effected models and a good suggestion on how to fix it.

Ford F150 Codes P0171 & P0174

Ford Expedition P0171 & P0174

Ford Mass Air Flow Sensors

Additional Information provided courtesy of AllDATA

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