The sensor or it's wiring are bad . Check for corossion or wire damage first . Mass air flow sensors are most affordable through Rock Auto online .
SOURCE: Service four wheel drive
Without further diagnostics, it could be any # of causes, but these are notorious for bad conections at the transfer case encoder motor and /or the encoder motor itself.The motor,when replaced may need to be reprogramed.Be sure the switch and wiring are functioning properly as the encoder and/or related control module are pricy$$
SOURCE: 4x4 in working
try reversing six to eight feet after shifting into 4WD. PLEASE RATE MY ANSWER.
SOURCE: little power cat converter red hot locate massive air flow sensor
the catalytic converter is clogged,needs to be relaced or other exhaust restriction check pipes and muffler, disconnect after the catalytic converter see if cat still glows
SOURCE: my engine shuts off while im driving
Check ecm for number 1228253. If it has this one in it you will have a cutting off problem. Gm replaced these with #16198264 The cam sensor magnet on the cam gear will deteriorate and give problems. This will require removal of the timing cover.
SOURCE: Blowing 4x4 Fuse, when put into 4 wheel drive
you may have a bad frt diff seliniod, try unpluging seleniod and putting into 4wd, if fuse doesnt blow then you know its the seleniod.also take a look at the wiring at the transfer case for any chafed wires,some of these trucks use vaccum also to operate 4wd check the vacuum switches for shorts,ive enclosed a wiring diagram to help you ,hope this helps ,good luck.
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