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Four wheel drive hubs wont engage

Have a black vacuum line thats between the battery n firewall that is smaller than the other 4 in that area and is not connected to anything. I highly doubt that f150's have and exaust for the vacuum system like an air equipped truck or trailer so it must hookin somewhere. Been high and low in there, whereever i could reach and cannot find a port anywhere. Has a longtime friend of mine who is a well known car guy stumped also.

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6ya6ya
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Posted on Jan 02, 2017

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jonbrown725
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SOURCE: 2000 F350 Super Duty Will not go into 4 wheel drive

I have recently had this problem with a customer. It seems the 4x4 low will only engage in neutral with the brake applied. And also check fuse. Then select drive and you will feel it lock in. Don't "goose" the fuel when attempting this.

Posted on Jan 14, 2009

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SOURCE: Ford F150 front tires won't engage in 4 wheel drive

look on fire wall pass. side you will see 2 parts with vacume lines attached 99 percent of the time that is what went i had the same problem

Posted on Feb 01, 2009

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SOURCE: 1994 chevy 1500 $ wheel drive wont engage

your problem is probably the front axle solenoid. it is in the center of the truck on the front axle and it is really easy to change. Simply unplug the electrical connector and use a wrench to loosen it. Spin it counter clockwise until it comes out........Manual hubs i believe are not available for this truck but i think there is a aftermarket cable you can buy and install to lock the front diff in.

Posted on Feb 17, 2009

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SOURCE: 2004 Ford F-150 extended cab FX4. 4WD problem

Your front hubs are automatic locking hubs, and the gears are hard nylon. These hubs break very easily, therefore causing you to lose your front wheel drive in 4 high, or 4 low. If you replace the hubs with "WARN (name brand) " manual locking hubs, you will never have the issue again. Of course, you will have to get out of the truck and manually lock the hubs, but they are metal gears, and much more durable. I've personally seen the issue several times, and changing the hubs has resolved the issue every time.

Posted on May 01, 2009

  • 29 Answers

SOURCE: 2005 Ford F150, 5.4L V8, 4x4; The transfer case

Encoder motor located on the transfer case is usually the problem. It is the motor that shifts the transfer case.

Posted on Sep 28, 2009

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2 Answers

4 wheel drive will not engage


A frequent problem with these trucks is the vacuum switch on the transfer case.It is a three port switch screwed in above where the shift lever comes out of the t/case.The switch just screws in,7/8 wrench if I remember correctly.When you remove the vacuum hose connector from the switch,you should hear a vacuum noise for a few seconds.If you don't check for a defective vacuum check valve near the firewall behind the engine,or a cracked vacuum resevoir.One other area to inspect is below the battery. Sometimes battery acid will leak onto the vacuum hose that goes to the actuator causing a leak in the hose,which will disable the four wheel drive.To check for a broken actuator cable,jack a front wheel,put your t/case in 4wd, move the diaphragm manually you should feel the axle lock in...the front tire should not turn by hand

Apr 09, 2010 | 1986 GMC Jimmy

1 Answer

2003 kia sportage 2l wont engage four wheel drive light comes on but doesnt engage


This is a long/hard one to answer as a few things can cause this. First, check the vacuum lines running from the engine down to the front axles for cracks, and make sure you have vacuum to the axle hub. Second, remove and inspect the front wheel bearings, they should be set to proper preload and there should be no signs of water in the hub. And last if there is water in the hub, that most likely means there is rust on the front axle, and the pitting caused by the rust will not allow vacuum to build up and ingage the four wheel drive. the later requires a new front hub kit $$$.

Feb 21, 2010 | 2002 Kia Sportage

2 Answers

4 wheel drive wont engage on kia sportage 2001


there are vacum line one on each side behide the wheels see if they are broke or leaking i had the same problem

Feb 10, 2010 | 2000 Kia Sportage

1 Answer

Is there a fuse on my 2004 f150 4.6L that runs the 4x4 actuator or vacuum solenoid my four wheel drive wont engage but the light comes on.


check the vaccum line behind the front tires if there still on there is a vaccum solenoid behind the battery on the firewall (iwe) it runs about 27 bucks at the dealer

Feb 09, 2010 | 2004 Ford F150

3 Answers

4 wheel drive will not engage on my 1989 gmc sierra 2500?


actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

Jan 07, 2010 | 1989 GMC Sierra

1 Answer

Four wheel drive wont engage. Tranfer case is


Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace

Dec 15, 2009 | 1998 Dodge Ram 1500 4WD

1 Answer

Four wheel drive lights come on but no four wheel drive


The light comes on indicating that the transfer case is engaged in 4wd, but that doesn't mean the hubs are locked. If you have automatic locking hubs, you should check to make sure they are working correctly. This GM vehicle may be equipped with vacuum locking hubs... meaning there is a vacuum line running from the transfer case selector to the hubs on each side. The vacuum makes the hubs lock into place. If those vacuum lines are damaged or missing, they wont lock. If you have electronic locking hubs, they may need to be replaced. Good luck.

Dec 09, 2009 | 1997 Chevrolet Blazer

4 Answers

Ford F150 4x4 Passenger side hub


The gear on the 4 wheel drive actuator and possibly the hub is stripped.
Remove wheel and brakes and take the four 18mm bolts out of the back and remove the cap on the end of the hub and take off a 12 mm nut. It should then come apart so you can see whats going on.

Mar 22, 2009 | 2005 Ford F-150

1 Answer

I engage the four wheel drive in my 2005 Ford F-150 when we had a snow storm this week.Now when switching out of fourwheel drive the transmission wines until you switch it back to fourwheel drive...


the four wheel drive uses vacuum hub locks. there is a vacuum solenoid on the passenger firewall in front of the battery box. sounds like you need a updated solenoid and possibly one or both hub locks. what happens is the old style solenoid vent allows water to get in and the hub locks freeze or stop working because of the water. the new style has a cover over the vent to prevent water from getting in.

Mar 05, 2009 | 2005 Ford F-150

4 Answers

Four wheel drive wont engage


I got ripped off by a dealer with a similar problem that came back two weeks later. $2.99 of vacuum hose later I fixed it myself. Check all the vacuum lines for rotted hoses before you fork out 3K and they are easy to do

Dec 07, 2008 | 2001 Kia Sportage

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