Question about 1997 Ford F150 Regular Cab

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4 wheel drive wont engage on my 97 f150 - 1997 Ford F150 Regular Cab

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Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

I would suspect that the front drive shaft will not turn, and the issue is with the vacuum shift for the front axle.

The vacuum disconnect motor is on the front axle ( item #10 in the picture below )
4 wheel drive wont engage - sscullys_4.gif

Close up of the vacuum disconnect motor ( this is in process of being repaired )
sscullys_74.jpg

The vacuum solenoids are mounted on the firewall, and take vacuum from the vacuum reservoir to move the shift motor when the GEM ( Generic Electrical Module ) calls for a mode ( 2WD or 4WD ).
The Pink line will have vacuum on it when in 2WD mode, the Light Blue when in 4WD.
Use a vacuum gauge to verify that the vacuum is on the line when selecting the mode.

Posted on Jan 05, 2011

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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: 4 wheel drive problem on Jeep YJ

Check the Vac, seloind on the front axel

Posted on Dec 21, 2008

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SOURCE: 05 f150 4x4. 4 wheel drive lights come on but it is not engaged?

change actuator in front hub water gets in there freezez and ruber seal rips part only 120.00 bucks not hard to change beat upper ball joint take of spindle nut think it was 5/8 3 bolts in back should fall out

Posted on Jan 21, 2009

sscullys
  • 984 Answers

SOURCE: I turn the electronic switch and the 4 wheel drive does not engag

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system
6cfa478.jpg

Here is a link to the TSB for the IWE solenoid in PDF format
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Start with testing to see if the front drive shaft turns while in 4WD to know which way do go with the repairs, the usual route is the IWE vacuum system ( lines or solenoids ), but I have seen shift motors be a problem also.
If you find a vacuum problem, you can remove and plug the vacuum lines at the IWE, and leave the front hubs locked in all the time, until you can diagnoses where the issue is at.
Just don't try racing anyone or expecting stellar acceleration , pushing a dead axle is going to consume some HP.

Posted on Dec 20, 2009

  • 11 Answers

SOURCE: 06 F150 4 four wheel drive wont work

usually the 4wd actuator will stick had the same problem in my 92 ranger which the f150's are the same setup you might try hitting the actuatot with a hammer it fixed mine and has worker ever since.

Posted on Mar 18, 2010

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