Question about 2006 Ford F-150
I am going to guess a bad vacuum line some where in the 4x4 hub system.
Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.
I get the bad vacuum line ( or vacuum box ) from the fact that the problem happens after vacuum has been applied to the IWE to pull the spring out. I would also guess this does not happen when in 4H or 4L.
Here is a vacuum block diagram of the IWE vacuum system
It could also be the IWE vacuum solenoid, there is a TSB on this ( right click save as ).
Posted on Jul 24, 2010
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Posted on Jan 02, 2017
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