4x4 wont engage

[roustabout04]

Ok the 4x4 wont work. Its esof. The lights on the dash come on like its supposed to. It even engages in the 4low minus the 4 part lol. Ive manually locked the hubs and the front dont pull still. Seems like if the switch wasnt working then it wouldnt show the indication on the dash. Im not sure how the esof works but any advice is appreciated. Thanks.

[Bend6.0]

I've seen several switches go bad. Had a friend who had to pull the switch out and manually touch the wires together to get the t-case to engage.

[strokit0919]

The motor is broken most likely. It's about 400$ to fix it mine is doing then same thing, you might also wanta check the transfer case

[NYC F-350]

http://www.powerstroke.org/forum/att...-work-esof.pdf
PDF file that covers the ESOF system with troubleshooting

[skanj0]

Troubleshoot the problem methodically. First check for vacuum at the back of the knuckles when the switch is flipped to 4x4. If no vacuum at the knuckles, work backward and trace the lines to the tee, and then to the vacuum pump itself.

In doing this on my truck a few weeks ago I found the portion of the vacuum line that runs vertical from engine compartment down to the tee had at one time made contact with the exhaust manifold - melting it completely closed. Got a piece of of rubber vacuum hose 4 inches long to act as a coupler, then got some of that 2000 degree aluminized sheathing sold at auto parts stores (for protecting/shielding fuel lines and wires) and used that to encase the vertical section of the vacuum tube - from the engine compartment to the tee (covering the entire section adjacent to the exhaust manifold).

Good Luck

[roustabout04]

thanks guys ill look at all this stuff when i get in from offshore. not like i need the 4x4 right now. im tearing the motor down to do studs and gaskets etc while im home this time.