Question about 1999 Ford F150 Regular Cab

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91 Ford F150 4 wheel drive wont engage

I rarely used it and seems to be a common problem if you dont engage regularly 4.9 liter auto

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

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

Jim1969pa3
  • 152 Answers

SOURCE: 2001 ford f150 supercrew 4x4......4 wheel drive

There is a special sequence for that. Let me see if I can remember... Pull to a level surface, put the parking barake on, put the truck in neutral, shift to four-wheel drive, release the brake, shift to drive.

The computer waits for this sequence. It has been many years since I did this. If it doesnt work, call your dealer shop and they will tell you the correct sequence.

Posted on Dec 21, 2009

sscullys
  • 984 Answers

SOURCE: I have a 2004 ford f-150 off road 5.4 liter. My

If this is a 2004 Heritage ( old body style ) and the transfer case is known to lock in ( check with truck jacked up, shift into 4WD and try to turn front drive shaft ), the next item to look at is the vacuum disconnect motor for the front axle. This is on the front axle, and will move when shifted into 4WD
3b8c336.jpg


It is item #10, on this parts diagram
b48b167.gif
If you do not have movement in this, check the vacuum lines with a vacuum pressure gauge, to see if vacuum is being applied ( Pink line is 2WD w/ vacuum is operation, Blue line is 4WD w/ vacuum operation ). If no vacuum at the lines, check them back to the vacuum shift solenoids
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4ef54b0.jpg

Posted on Jan 04, 2010

toneman2121
  • 775 Answers

SOURCE: spark plug wire diagram for 91 ford f150 302

http://www.ford-trucks.com/forums/731055-plug-wire-diagram.html

Posted on Mar 12, 2010

sscullys
  • 984 Answers

SOURCE: 2004 ford f150 4 wheel high will not engage 4 low

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
sscullys_34.jpg

Posted on Dec 06, 2010

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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.
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