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My 4WD Low sometimes engages on its own and is difficult to get out of it; no light changes on switch. Can't tell if actually engages or if the engine just reacts like it is engaged. Tachs about 500 higher and increased sound in engine compartment. Otherwise appears to work normal. WTF???
It sounds just like it is in 4WD Lo, the high whine, but the tach only indicates about 500 or so higher than normal. Pickup is a bit sluggish, but I can obtain normal speeds at a slightly higher tach. Strange huh?? Could it be the mode sensor or I/O speed sensor?