Question about 1993 Ford Bronco

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4wd wont work

The electronic box works all axles and shafts turn every thing indicates it's in 4wd but the front tires simply won't turn

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  • 33 Answers

It will more then likely be a bad transfer case shift motor if the locking hubs are in good shape and the switch is good.

Posted on May 23, 2009

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1 Answer

How do I know whether 4x4 is working?


that is part time 4wd
and i bet has manual locks on both front axle ends.
how'd i know that.???? grin
first off PT 4wd is for ICE or offroad
SO if NO ICE roads handly (i cant see you drive)
then go off road, or gravel road, or not pavement.
then shift to 4wd.
the rear will have power, for sure.
so that means how to test the front end
i do so on jack stands
put the car up on left side
engine off.
lock the front left lock and right.
now turn the left tire by hand,, bingo you cant.

if you can and the axle behind it does not spin that means the left lock is bad.
if the left axle does turns and so does the right axle , that means th right lock is bad.
3 tire on ground rules. part time.
the front drive shaft will not turn, if it does the transfer case is not in 4H or 4L. if the transfer case is working the rear drive shaft can not turn, in this test. (cuz both tires are on the ground)
see manual locking hubs test here and failure modes.
http://www.fixkick.com/part-time-test.html

Nov 18, 2015 | 1987 Suzuki Samurai

2 Answers

2004 envoy 4 wd quit working


I had TONS of issues with my 2001 Jimmy 4wd. A few things to check; the 4wd actuator switch, the vacuum switch, hub assembly, and the electronic 4wd dash switch.

Apr 19, 2014 | 2004 GMC Envoy

1 Answer

Four wheel drive actuator


I would try taking the right tire and cv axle off there next to the oil pan is a part that the axle slides through.it has a connector that engages the axle or 4x4 but if it is dry it will need to be replaced or checked out.it is kind of hard to take all of that off but check it out

Dec 09, 2013 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be


The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...

May 11, 2017 | 2003 GMC Envoy

1 Answer

2005 Trailblazer XT won\'t go into 4WD. Front hubs don\'t engage with switch in cab. It will gear down to 4wd Lo but front wheels won\'t engage. Please help. Can\'t afford the dealer!


i've been told it was the 4wd actuator located on the passenger side near were the cv joint goes in to the front axle a good test is to floor jack it up so both wheels are off the ground and have someone on the other side , put in nutrual turn both wheels one way at same time and the 4wd drive shaft should turn if not its your actuator, costs about $86 for anew actuator and takes about 5 mins to change once you have the tire off

Feb 11, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

1997 GMC Suburban electric 4WD will not engage 4WD


Check the actuator cable that activates the front axle disconnect. It is bolted to the inner fender and the cable runs down to the axle. If you apply vacuum it should pull in and shift the interlock. To see if it is working, jack up the right front so the tire clears. The tire should rotate pretty free. Now engage the interlock. The tire should become harder to turn and the front drive shaft should turn. Now engage the 4X4 (with the trans in park) and see if you can still turn the tire. You shouldn't be able to turn it with the interlock activated.

Keep us upodated (remember to rate this answer).

Dec 22, 2010 | 1997 GMC Suburban

1 Answer

2003 Ford F-150 4WD is not working. Light does not come on in the dash when switched to 4WD, no clicking noise, no 4WD.


Which type is it, ESOF ( Electronic Shift on the Fly ) or MSOF ( Mechanical Shift on the Fly ) ?

Best to check by jacking the truck up ( taking safety precautions, parking brake, chock the wheels, jack stands, etc ), turn the key to the run position and place into 4WD.
If the front drive shaft turns, the problem is in the transfer case.
If the front drive shaft does not turn, the problem is in the front axle.

I would suspect the front shaft does not turn, and the most common cause of this is the vacuum motor on the front axle, the vacuum lines to it, or the vacuum solenoids.
The vacuum shift motor is what locks the front wheels in, and without this action, the PM does not get the confirm that the truck is good to go, and illuminate the cluster indicators ( 4x4, and if 4L the Low Range lamps ).
There are 2 vacuum solenoids, one is 4WD one is 2WD ( to move the motor one way or the other ).
Start with checking for vac on the vacuum motor ( actually it is a diaphragm ). The pink line should have vacuum when in 4WD, the blue line should have vacuum when in 2WD. If not, time to work back towards the solenoids. Use a short length of hose on the vacuum solenoids, and retest.
If still missing vacuum on the 4WD solenoid, I would suspect it is bad, but best to test on the other side of it, to make sure the vacuum reservoir ( mounted behind the battery box ) is supplying vacuum to the solenoids.

This is just the most common cause, best to confirm with the 1st test above, to know if you should look to the trans case, or axle.

This is what the vacuum shift motor looks like on the front axle
cb3a8d4.jpg

These are the vacuum shift solenoids
ef7657a.jpg

Dec 12, 2009 | 2003 Ford F150 Regular Cab

1 Answer

4wd won't work axles turn electronic box engages front tires won't lock in


have you checked to ensure that the actuator is working? if the actuator isn't working then the ring gear wont engage and won't turn the front shafts. try turning your key to accessory and put the truck in 4wd

May 23, 2009 | 1993 Ford Bronco

1 Answer

Front tires wont pull in 4wd


You have an actuator on the front axle, check for power or pull out and check for damage. You can also check for proper working while out ,make sure ground is good.

Jan 16, 2009 | 1998 Dodge Ram 1500 4WD

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