does the 4wd system do a self check when truck turns on?
I'm pretty sure I have a hub slowly dying.
2 months ago I was driving at low speed in 2WD (as usual) and all of a sudden it felt like my front driver wheel locked up. Pulled over and heard this loud hissing noise. Turned it off and back on and heard some hissing, but wheel turned freely. Cautiously went home. Hi/Low lights flashed. By the time I got home, no hissing. Next day, my lights quit flashing. Few days later, I tested the 4WD and it engaged no problem. Thought it was gremlins.
Yesterday, I turn my truck on and getting ready to head out and hear some clicking. My switch was in 2WD, but it sounded like it was trying to engage into 4WD. After a bit, my lights start flashing. Later in the afternoon, I have my window down trying to hear some hissing, but I hear a faint squeaking in relation to my speed. Hit the brakes, no change, squeaks just the same.
Now, it clicks every time I start the truck like it is trying to get into 4WD, and then my lights flash. I do not hear any hissing.
Would a loss of vacuum up front have anything to do with the 4WD system trying to engage while the switch is in 2WD??
Mine: '98 Ranger XLT 3.0L SuperCab w/ manual 4x4 "Off Road" 193k miles
Wife: '07 Mitsubishi Outlander LS AWD 3.0L 128k miles
My 3.0 puts out 150HP...hers puts 220HP...something is wrong here!
Future Restoration: '77 Chevy 2WD K5 Blazer