Question about 2004 Ford F150

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My 2004 f150 does not always work in 4 wheel drive but I replaced a vacuum line that goes to the front acuator on the front axel, then i replaced the right front hub assembly with a used one and the 4 wheel drive seemed to work fine,but the used hub was warped so i put the old one back on temporaraly and now the four wheel drive does'nt work. how does the hub affect that. need to know. mike m,

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The IWE is operated by a common vacuum system. When you say does not work, not sure what you are getting at ( only 1 wheel locks into place, or neither ).

Could be you had the vent and vacuum lines reversed, and this did not keep the IWE gear pulled out and it rounded off on the one you did not replace.

Is the issue the front axle does not lock in, or does the drive shaft not lock in at the transfer case ?

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

When you get to this point, post back a comment to this problem with the info.

Posted on Nov 13, 2010

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This is a block diagram of the IWE vacuum system
sscullys_37.jpg

There is a TSB on the IWE solenoid for the 04 to early build 06 MY F-150s ( right click save as )
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

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Until you can get it fixed, pull the vacuum lines on the IWE ( make sure it is the vacuum line, not the vent line that runs into the engine compartment, and just hangs up there ).
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Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
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3b8c336.jpg


It is item #10, on this parts diagram
b48b167.gif
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b684463.jpg
4ef54b0.jpg

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