Question about 2006 Ford F-150
Manual hubs are pretty much a thing of the past with dash selected drive systems. the first thing you need to do is verify the operating method of your transfer case, and look there for problems. Inside the cab is usually a protected environment, where as the connections on the transfer case itself are not. If it is electrically operated disconnect the electrical connections and soak them with a good electrical connection cleaner available from your automotive supply store, then use a brass brush to clean the connectors (make sure the battery is disconnected by removing the negative terminal) and then put everything back together, and check the operation. Since you state it is erratic operation, I doubt it is a vacuum operation issue as vacuum operated controls rarely fail intermittently, However to check this it is easiest to simply route a temporary vac line to a vacuum source and the control on the transfer case and see if it operates the transfer case. if it does, then follow the original vacuum lines (from the source and to the transfer case) back to the dash mounted control looking for damage, and replace as needed, if no damage is found look to the control itself. It MIGHT be worth your while to save time on trouble shooting a vacuum leak by just replacing the vacuum lines right out, but you need to base this on your budget vs your time. Chasing vacuum leaks can be a problem in itself and is often just easier to start out by replacing the line if it is suspect.
Posted on Dec 09, 2014
The other answers are feasible. If a vacuum problem you can try using a vacuum pump to see if the vacuum lines are intact. The electric system is usually less dependable. Sometimes the electric switch on the dash is at fault as they use 1 wire to move the shift solenoid for all positions and only vary voltage to get the shift solenoid to travel into different positions. Even a broken LED indicator light on the dash 4x4 shift selector can throw off the voltage. This gives you different functions for the correct twist of the selector. Can't remember the electric values for each position but info is available online including pin position.
Posted on Nov 23, 2014
There are several things that can cause this. Without further info, I.e. Manual locking hubs or automatic hubs. I am going to assume it is an automatic hub system.
1 pv solenoid could be sticking.
2 vacuum leak in the pv hubs (actuator(s))
3 vacuum leak in the plastic vacuum tubing to pv hubs and sol.
there is also a shift motor that could be faulty or the wiring or connectors to them.
I would start with a visual inspection of the vac hoses, and make sure there is not a loose hose or kinks, or crack.
also check all the connections at shift motor for water ingress or corrosion/poor connections.
I would need more info for this veh.
Posted on Nov 23, 2014
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Posted on Jan 02, 2017
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