4wd will not engage

[RanchStroke]

Budy has an 04 4wd which will not auto engage 4wd but can manually engage 4wd. Does anybody have any ideas? do yall know were i can get a diagram of the 4wd system or a picture of where the pump and or solenoid are? Thanks

[Hoss350]

It's on the right side of the engine bay(passenger side) mounted on the apron panel, check the vac. lines going down to the hubs on each side, I bet his pump is running constantly like mine. LOL I still have yet to find the broken hose.

Hoss

[LHMissions]

Tell tale sign if its a vacumme problem is if 4wd switch is engaged and the defrost comes on (assuming you have the fan running to start with and on something else other then defrost).

4wd hubs could be the most probable cause of the vaccume leak though there are numerous other possibilities.

[GoldieStroker944]

yea i would say its vaccum problems my 01 did the same thing

[2fast2reid]

He has a vac leak somewhere.

[Thrill Seeker]

I would check the seals on the hubs on the inner side to see if they are popped out like mine was causing the auto lock not to work.

[RanchStroke]

OK thanks next time I see him I will check. Does anybody know where I can find a diagram or picture of the whole setup without having to go buy a chiltons?