ESOF?

[95_stroker]

What are some of the most common problems with the ESOF that would cause the 4x4 NOT to engage. Switch in the dash? Motor on the transfer case?

Ideas?

 

[RoyBoy]

If the transfer case is engaging (the 4x4and/ or low range light will come on) The most common is either a vacuum leak (either a line or the hub seals) or the hubs themselves are sticking. Try to manually lock the hubs in and out, they could just need a little freeing up. With the truck not running, key on, you will be able to hear the hubs actuate too...

 

[bushpilot]

vac. leak...by either a hose fallin off between the hub and the
pump or the hub seal is toast (hub seals are about 5 bucks per pair)

 

[95_stroker]

No, t-case is not engaging. That leads me to believe either the electric shift motor is kaput or the selector switch in dash?

 

[RoyBoy]

Are the hubs engaging?
Did you check the fuses?

 

[95_stroker]

Are the hubs engaging?
Did you check the fuses?

OK, did a little R&D........ I can hear the t-case motor attempt to engage but I get no 4x4 light on dash (lights work upon initial KOEO light check). When I manually lock hubs I am still not in 4x4 (road test). I also have full vacuum controls of heater/AC/defrost so again this points me to the t-case motor not functioning properly.

 

[RoyBoy]

Sounds like you're on the right track

 

[95_stroker]

Sounds like you're on the right track

I removed the three bolts that hold the electric motor to the T-case and flipped the switch. Sounds to me like the gears are stripped in the little motor unit. The motor runs but the output shaft doesnt turn. I put a crescent wrench on the T-case shaft and turned it and viola`, the front drive shaft locked in. New t-case elect motor at NAPA is $139.00.

 

[hheynow]

New t-case elect motor at NAPA is $139.00.

See what happens when you let Rampy drive your new truck ...

 

[atk]

I removed the three bolts that hold the electric motor to the T-case and flipped the switch. Sounds to me like the gears are stripped in the little motor unit. The motor runs but the output shaft doesnt turn. I put a crescent wrench on the T-case shaft and turned it and viola`, the front drive shaft locked in. New t-case elect motor at NAPA is $139.00.

thats a good price, a good used one up here is that much. after you get new motor in, probaly good idea to engage 4wd few times a month, helps to keep things working properly, but i guess you know this already....just my 2 cents....that is a very nice truck.... ....