Hey Guys im having problem with my 2005 F150 4x4. When i try to shift it in 4x4 it doesn't do anything. Its an electonic shift on the dash. I checked the fuses and they appear to be fine. When I start the truck the 4x4 light comes on with the other lights and then goes off like normal. I did some reasearch and thought it may be the iwe solenoid so I replaced it and checked the vacuum lines. The front right vacuum line was clogged with mud so I cleared it. I thought that would fix it but still nothing. I jacked the truck up and turned the wheels while the truck was off and both half shafts turned indicating the iwe were engaged. Then i turned on the truck and tried turning the wheels and neither half shaft turned, which i assume means the vacuum is being applied to the iwe and disengaging it which should be correct. I also tried tapping on the shift motor just see if maybe it was jammed. Not sure else to try any help would be much appreciated....thanks

 

Everything You Wanted To Know About The IWE System....And Then Some! - F150online Forums
Hopefully this will help you diagnose your problem..