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Old April 27th, 2009, 06:04 PM   #1
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03 150 4x4 problem

So my mother has been complaining for a while that the 4wd in her truck isn't working...so I decided to finally check it out for her, and it isn't, but I have no clue about anything on this truck so I decided to ask for some help form you guys. (BTW, its a 5.4 auto, with auto everything)

Here is what I figured out.

The 4wd will works when it wants to, IE, if you play with the button long enough (it took me about 4 minutes to get the the front to engage.) I tried engaging it from a dead stop in drive, in neutral, park, rolling in drive and 10 MPH and in reverse, and it seemed to kick in the fastest if I was doing about 10 MPH with my foot off the gas.

it will disengage when it also feels like, which usually when you really need it.

from what I can tell (which you guys could probably straighten me out on) is that the transfer case is electrically operated, and the front diff (hubs) works from a vacuum source. When I was looking at it, there is a vacuum actuator right in the center. I highly believe the transfer case is kicking in like it is supposed to, but I think its the front diff (well, hubs) that is not doing its job.

Is there any common problems on these? or does anyone have a idea for me to look at. thanks for the any help.

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Old April 27th, 2009, 06:12 PM   #2
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Most likely a faulty vacuum actuator motor.

Many ford techs on this site willing to help out

Last edited by IDIeselman; April 27th, 2009 at 06:15 PM.
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Old April 28th, 2009, 12:59 PM   #3
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The front axle uses a vacuum operated axle disconnect. If you have a vacuum issue this would engage/disengage at various times.

Did you notice if the air comes out the defroster vents when the 4x4 disengages? Good indication of a vacuum leak.
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