Join Date: Apr 2010
Location: Grand Rapids MI
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MAF is mass air flow sensor, that is the thing thats plugged in in the air intake tube.
That is what tells the ECU how much air the engine is sucking it.
If that is bad/unplugged the ECU has no idea how much air the engine is using and will default to a preset parameter and make a educated guess based on the inputs from the other senors, TPS, coolant temp, RPM, etc.
Any one sensor failed and the engine will run, it might run rough but it will run, more than 3 sensors bad and it wont run.
2nd owner of a '97 Disco with a ARB winch bumper, SD roof rack, Rover Racks ladder, Cooper S/T's and 220,000 miles on the clock and still a daily driver.