4x4 problem - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 12-23-2012, 08:59 PM Thread Starter
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4x4 problem

I get nothing when switching 4x4 on. Checked fuses and relays , could the transfer case motor be out? Would the dash 4x4 light still come on if the transfer case motor was shot?

08 Black SCREW 4x4 6.4 SOLD
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post #2 of 11 Old 06-25-2015, 01:32 AM
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I have the same issue right now...did you figure out what the problem was?
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post #3 of 11 Old 07-16-2015, 02:44 PM
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I went through this a few months ago. My 4x4 stopped working after during a off-road trip in snow IN Socal. I never had a light come on either. The auto locking hubs are Pneumatically actuated (air pressure). If can't manually twist and lock the hub into 4 wheel drive you have bigger problems. There's a tiny air compressor and tank that its used to store pressure to auto engage when you twist the knob. On my truck, the compressor was bad and air lines were broken. A new compressor and lines fixed it. i can post up some photos of the compressor

2008 F-250 4x4 XLT CC shortbed
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post #4 of 11 Old 07-16-2015, 06:11 PM
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The vacuum pump for the hubs is located on the firewall side of the degas bottle. If you have broken lines, the pump will run continuously and the hubs will not engage. Likewise, if the pump doesn't run for a minute or two at start-up, you could have a bad pump.
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post #5 of 11 Old 07-16-2015, 06:19 PM
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My apologies for screwing up the terms. It is vacuum versus positive pressure but the principal is the same. Every third or four startup, my pump can be head running for 20 seconds or so.

2008 F-250 4x4 XLT CC shortbed
150,000 miles
SCT Livewire TS+ w/Gearhead tunes
S&B CAI with side vent intake modification
4" MBRP cat-back exhaust
On board air system w/arlines to both bumpers
1,800 watt inverter with in cab 120 volt outlets
Wurton LED fog lights
Wurton 20" combo light bar
LED backup flood lights
LED bed rail lights
Side emblem LED accent lights.
Sinister Diesel Coolant Filter
Pioneer AVX2800 Head unit w/Rockford Fosgate 12" Sub
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post #6 of 11 Old 07-16-2015, 06:27 PM
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Craff, I wasn't correcting you. I didn't even realize you posted pressure instead if vacuum 18 hr work days make my brain numb.
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post #7 of 11 Old 07-16-2015, 06:38 PM
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No worries. I'm in the same boat hours wise.

2008 F-250 4x4 XLT CC shortbed
150,000 miles
SCT Livewire TS+ w/Gearhead tunes
S&B CAI with side vent intake modification
4" MBRP cat-back exhaust
On board air system w/arlines to both bumpers
1,800 watt inverter with in cab 120 volt outlets
Wurton LED fog lights
Wurton 20" combo light bar
LED backup flood lights
LED bed rail lights
Side emblem LED accent lights.
Sinister Diesel Coolant Filter
Pioneer AVX2800 Head unit w/Rockford Fosgate 12" Sub
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post #8 of 11 Old 07-16-2015, 07:16 PM
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Always worth checking that pump anyway, if a line is cracked or broken and its always running it will burn out in short order.

What I am guessing is he blew a line at some point during his off road excursion. It is just a matter of finding that line and fixing it. Easier said than done sometimes.

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post #9 of 11 Old 07-21-2015, 09:30 AM
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with manual hubs you should be able to engage 4x4 with the switch in the cab correct? the lights don't even come on for 4x4
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post #10 of 11 Old 08-06-2015, 10:46 AM
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Craff- can you post photos of what you replaced? thanks
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