Self engaging 4x4 - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 03-27-2012, 07:57 PM Thread Starter
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Self engaging 4x4

I've had this problem on and off for awhile now but tonight my 4x4 engaged itself and I couldn't get it back into 2wd like I usually do. I tried flipping it from High to Low then back to High then 2wd and the transfer case stayed engaged. When I flip it to 2wd, the front hubs will unlock but the transfer case stays in 4x4. I tried backing up, driving forward, flipping the auto hubs manually to lock then back to auto, absolutely nothing worked. Anyone have any other ideas and how I might resolve this issue all together?

Tom
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post #2 of 13 Old 03-28-2012, 04:29 PM Thread Starter
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No one? I had the 4x4 disengaged partially to where I could spin the driveshaft completely but it still spun the front axle. Hubs aren't locked either.

Little more info:
Well, having a "WTF" moment... I had my mom cycle the 4x4 switch for me while I moved the driveshaft. I could turn the driveshaft about 1/2" when she cycled it to 2wd then when she cycled to 4x4 I could only turn the driveshaft 1/4". Then I was trying to turn it and I was able to spin the driveshaft all the way around so I thought I had it unlocked. The front axle shafts were still spinning so I was obviously wrong. Went to go for a test drive and started hearing the left front hub again, got out and sure enough it was still in 4x4. Any ideas? Shift motor perhaps?

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6

Last edited by Toms01PSD; 03-28-2012 at 04:51 PM.
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post #3 of 13 Old 03-28-2012, 04:59 PM
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So the knob on the dash is set to 2 wheel high but the transfer case is engaging into 4 high as if you had turned the knob to 4 high. Do you think it might be a wire shorting out or a bad switch? Sounds like something is telling the transfer case motor to actuate. Bad switch, faulty wires, or bad motor. I have not had to work on my 4x4 system yet, but would think you could test each of the parts in the order I listed. All will have to be independently tested. Hope this helps!

2002 F250 CCSB Lariet 7.3 Auto
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post #4 of 13 Old 03-28-2012, 05:02 PM
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I just read your post again, I missed where you flip to 2wd and the hubs unlock, sounds like a transfer case motor is locked up/ faulty

2002 F250 CCSB Lariet 7.3 Auto
2" helper springs 285/75R16 Toyo M/T
80 gallon fuel tank in bed
DIY 6637
Warn Premium Hubs
Ford Transmission @ 407,425 miles 3/24/12
Full Force Injectors
Avic X930BT w/ backup camera

www.riverchasefarms.com
"We Farm for Ducks"

As of 6/11/16 605,552 miles

2005 Excursion Eddie Bauer 4X4 6.0
Stock 225k miles
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post #5 of 13 Old 03-28-2012, 05:07 PM Thread Starter
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Quote:
Originally Posted by Codum View Post
I just read your post again, I missed where you flip to 2wd and the hubs unlock, sounds like a transfer case motor is locked up/ faulty
It's done this before a few times but I would just flip it to 4x4 on the dash then back to 2wd, back up 20 ft or so and it would be unlocked. I don't even try and put the truck in 4x4 and it will go in 4x4 by itself randomly, only this time I can't get it out... The hubs will lock and unlock with the dash knob, but the t-case won't and I don't want to tear up my t-case or front end. I tried messing with the connector on the shift motor but it's nice and tight on there so the connection seems good (obviously). I'm thinking shift motor now...

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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post #6 of 13 Old 03-28-2012, 05:12 PM
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Forget that, its the operator....lol

Im thinking more and more its the motor. I would try to lightly tap on the transfer case motor and see if disengages. Also, see about taking it off of the transfer case, and manually getting the thing out of 4wd.

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post #7 of 13 Old 03-28-2012, 05:25 PM Thread Starter
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Quote:
Originally Posted by HVAC SuperTech View Post
Forget that, its the operator....lol

Im thinking more and more its the motor. I would try to lightly tap on the transfer case motor and see if disengages. Also, see about taking it off of the transfer case, and manually getting the thing out of 4wd.

Sent from my Acer Android Tablet
I'm starting to think that with all the problems i've had with trucks over the years.

I dropped the skid plate awhile ago but it's too dark to mess with it tonight. I'll see if I can find a write up explaining how it comes out of there and if I can disengage it manually... I tried tapping on the motor on the side where the connector plugs in but I didn't have any luck doing that while trying to turn the driveshaft.

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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post #8 of 13 Old 03-30-2012, 04:24 PM Thread Starter
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Turns out something is wrong internally with my transfer case. I pulled the motor and had someone flip the switch on the dash and I watched the mechanism function like it's supposed to. I then put a wrench on the piece that sticks out of the t-case that the shift motor connects to and flipped it between 2wd and 4x4 high/low manually. It was in the 2wd setting where it's supposed to be but it's still turning the front driveshaft. Now I have to pull my t-case and have it looked at.

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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post #9 of 13 Old 03-30-2012, 05:45 PM
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Quote:
Originally Posted by HVAC SuperTech View Post
Forget that, its the operator....lol

Im thinking more and more its the motor. I would try to lightly tap on the transfer case motor and see if disengages. Also, see about taking it off of the transfer case, and manually getting the thing out of 4wd.

Sent from my Acer Android Tablet

Um......echo......echo.....

Hahahahahaha...least you got it figured out bud.
Sent from my Acer Android Tablet

Nick
E99/CC/Lariat/Factory Wide Body Kit
"The Mistress"
Power Hungry Performance HYDRA Chip
Custom Tuned by Bill@PHP, Tony Wildman@Total Diesel Performance and Lars@Gearhead



D66 w/Dieselsite WW2, Full Force 250/100s, Adrenalin HPOP, Built Trans, Walbro Fuel Pump, S&B Intake, 6" Stacks, Leveling Kit, Eagle Alloy Wheels, 315/75/16 Grabber AT2s & Much More




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post #10 of 13 Old 03-30-2012, 06:57 PM Thread Starter
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Quote:
Originally Posted by HVAC SuperTech View Post
Um......echo......echo.....

Hahahahahaha...least you got it figured out bud.
Sent from my Acer Android Tablet
It's not the shift motor, it's something interal in the t-case. I pulled the shift motor and watched it function properly.

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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