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Transmission & Drive train

4x4 WONT ENGAGE


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Register to remove these ads. It's free! Ok guys I had a friend do the the upper and lower ball ...



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Old 02-06-2013, 04:43 PM   #1 (permalink)
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Ok guys I had a friend do the the upper and lower ball joints and control arm on my 1999 for expedition XLT both sides...This was done about 2 months ago ...The other day I went to pull a stump out and was not able to engage the truck in to 4 wheel drive ... I hear no click when I turn the knob and the light dosnt come on in the dash window ... When I first start the truck the... 4x4 light comes on then go off ... Is there any thing I can look at before sending the truck to the shop Thanks Again Greg !!!!! :goofy_b atman::g oofy_batman:
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Old 02-06-2013, 05:53 PM   #2 (permalink)
 
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Most common cause is a bad transfer case shift motor.
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Old 03-18-2013, 10:14 PM   #3 (permalink)
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Yep shift motor more than likely but check your vacumm lines first. May get lucky and have them unplugged
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Old 03-19-2013, 08:30 AM   #4 (permalink)
 
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Originally Posted by Flightstopper View Post
Yep shift motor more than likely but check your vacumm lines first. May get lucky and have them unplugged
I was thinking vacuum lines myself. Seeing as there's no noise detectable when you flick the switch I'd start there. If they're good then it's likely the shift motor as mentioned. Look for one online and you'll same some cash. Amazon and rock auto both carry them.
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Old 11-17-2013, 10:41 AM   #5 (permalink)
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ok guys just getting around to look at this now that we are heading some where that has snow .... Where can I find a diagram showing me the vacuum lines that would effect the 4x4 not to engage .... Thanks again Greg !!!!!
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Old 11-17-2013, 10:59 AM   #6 (permalink)
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would also check your fuses Check this post "yet more 4 wheel drive problems" there are prints there for a 97 but the wiring is the same for your 99. Could be a bad fuse or bad relays or a bad selector switch. At least check for power before you replace parts
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Old 11-17-2013, 11:53 AM   #7 (permalink)
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Also check the wiring to the wheel speed sensors. Being you had the ball joints and control arms replaced. I know when I replaced mine it does tend to put some stress on those wires if your not careful.
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Old 11-19-2013, 06:09 AM   #8 (permalink)
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Mine spontaneously stopped working a few months ago. It's on my fix it must. Prolly the shift motor.
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Old 11-19-2013, 03:44 PM   #9 (permalink)
 
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does anyone have a picture of the module behind the fuse box? I have same problem. Worked then nothing. I've tested the switch. I get 4v then 3v then 1v. Awd , 4h and 4l. no clicking, no lights. I opened the hood where the airlines go to hubs. Nothing there. Fuses are good. Does the power come from the shift motor?
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