4x4 wont engage - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 12-06-2011, 07:28 PM Thread Starter
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4x4 wont engage

my 4x4 will not enage at all?????

any suggestions

2008 F250 CCSB
Gearhead Hot Street
No limit intake and Cold Side Pipe
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post #2 of 20 Old 12-06-2011, 07:35 PM
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Bet the locking hubs are messed up
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post #3 of 20 Old 12-06-2011, 07:40 PM Thread Starter
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how can i check that?

whats the cost to fix that?

2008 F250 CCSB
Gearhead Hot Street
No limit intake and Cold Side Pipe
EGR Delete
CCV Mod
5" Flo Pro
Ranch Hand
35" Nittos

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post #4 of 20 Old 12-12-2011, 01:27 PM
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If it was me i would turn the 4x4 knob and listen to make sure the electric motor is working if it is you will know its a hub problem. Im not sure if the hubs on these new trucks are but on my old 2000 modle they were vacuum operated i took the old hubs off apart and the were siezed up, i actually ended up buying a set of warn lock-outs, i hadto ge out of the truck to lock them but they were alot stronger then those sock ones. If the hubs are vacuum operated you will see a little rubber line on them, they might be leaking or siezed up. you might also try turning them from auto to lock and see if they engage.
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post #5 of 20 Old 12-12-2011, 01:38 PM
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Quote:
Originally Posted by 6.4PSD View Post
how can i check that?

whats the cost to fix that?
Ya still under warranty??? Take 'er back to let them fix it. Just sayin'!!


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post #6 of 20 Old 01-08-2012, 05:41 AM
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I might as well add to this thread rather than starting a new one. I got my truck back from the garage this week and only drove it 2 days. They changed out my turbo that the actuator is attached too and tightened up a band clamp on my downpipe to solve my excessive cab smell during regen.

Last night I went to tune the truck and when done I tried to use 4x4 and it would not engage. I turned the hubs and still nothing. During the diagnostics check when you first turn the key the vaccuum pump doesn't fire up and if you turn the know from 2wd to 4wd I cannot hear the actuator in the tcase engaging like I can on my buddies 2008.

Any ideas what the problem could be? I suspect maybe a blown fuse for the vacccuum pump/4x4 circuit. I can't find my owners manual to check what fuse #. Could someone tell me where and what # the fuse is so I can check it?

thanks

My Little Truck
2008 F350 FX4 Superduty Fully Loaded
6" Frankenstein Lift
20" Jessie James Rims
35" Toyo MT
Chrome Steps and Box Rails
Jackrabbit Sliding Bedcover
Eclipse Navigation/DVD with Rear TV's
SCT9625OR , Powerstroker67 DPF/DOC and 4" MBRP

My Big Truck
1991 Toyota 4runner
Solid Axle Swap
19" over Stock using F150 leaf springs
D60 Front 14BFF Rear
Detroit Locker up front, Mini Spool in the rear
39.5" TSL on Custom Hummer Beadlocks
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post #7 of 20 Old 01-08-2012, 06:15 AM
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Vacuum pump should only work when the truck is running. Sounds like the accurate is out. Check fuses first


2008 F350 srw Crew Cab 4x4 long bed
5"flo-pro downpipe back exhaust
h&s mini maxx custom dash mount
275 70r18 BF Goodrich T/A k/o tires
TWIN Turbo w/ s&b cold air intake
Air dog II and sinister EGR Delete
Detroit locker, B&W turnover ball

2005 f-250 crew cab short bed
King Ranch 364,000 miles
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3312.50r17 Firestone Destination m/t


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post #8 of 20 Old 01-08-2012, 06:17 AM
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Actuator **


2008 F350 srw Crew Cab 4x4 long bed
5"flo-pro downpipe back exhaust
h&s mini maxx custom dash mount
275 70r18 BF Goodrich T/A k/o tires
TWIN Turbo w/ s&b cold air intake
Air dog II and sinister EGR Delete
Detroit locker, B&W turnover ball

2005 f-250 crew cab short bed
King Ranch 364,000 miles
6.0 Superchips (for now)
3312.50r17 Firestone Destination m/t


"Every engine deserves a turbo, only a few deserve 2"
- Some Great American
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post #9 of 20 Old 01-08-2012, 12:16 PM
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Quote:
Originally Posted by the-last-international View Post
Vacuum pump should only work when the truck is running. Sounds like the accurate is out. Check fuses first
I really hope it is a fuse and that the pump and actuator is on the same fuse

My Little Truck
2008 F350 FX4 Superduty Fully Loaded
6" Frankenstein Lift
20" Jessie James Rims
35" Toyo MT
Chrome Steps and Box Rails
Jackrabbit Sliding Bedcover
Eclipse Navigation/DVD with Rear TV's
SCT9625OR , Powerstroker67 DPF/DOC and 4" MBRP

My Big Truck
1991 Toyota 4runner
Solid Axle Swap
19" over Stock using F150 leaf springs
D60 Front 14BFF Rear
Detroit Locker up front, Mini Spool in the rear
39.5" TSL on Custom Hummer Beadlocks
Custom Baha Fenders
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post #10 of 20 Old 01-08-2012, 09:18 PM
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Quote:
Originally Posted by the-last-international View Post
Vacuum pump should only work when the truck is running. Sounds like the accurate is out. Check fuses first
This is incorrect information. The vaccuum pump does work with the ignition in the start position. I pulled my 2 vaccuum lines up front (the little white box about 6" to the right of the Passenger battery) with the motor off and heard the whoosing sound of air. I then turned the key to the start position and the vaccuum pump fired up right away.

So its not my vaccuum pump.

I pulled my dash and unplugged and plugged the connector back in and that didnt make anydifference either....so its not a connection on the dash.

Tomorrow I try the fuses and relays.

My Little Truck
2008 F350 FX4 Superduty Fully Loaded
6" Frankenstein Lift
20" Jessie James Rims
35" Toyo MT
Chrome Steps and Box Rails
Jackrabbit Sliding Bedcover
Eclipse Navigation/DVD with Rear TV's
SCT9625OR , Powerstroker67 DPF/DOC and 4" MBRP

My Big Truck
1991 Toyota 4runner
Solid Axle Swap
19" over Stock using F150 leaf springs
D60 Front 14BFF Rear
Detroit Locker up front, Mini Spool in the rear
39.5" TSL on Custom Hummer Beadlocks
Custom Baha Fenders
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