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4x4 Not Working 1999 - F150 Help !!!

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  #1  
Old 09-12-2009, 08:01 AM
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Question 4x4 diagram F150 1999

How does this work? Is there any place I can find a schematic for the 4x4 system?

Thx

Ben
 

Last edited by caribbeanford; 09-12-2009 at 08:18 AM.
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  #2  
Old 09-12-2009, 09:00 AM
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Not enough info.

1. Is it ESOF of MSOF?
2. Does the 4x4 light come on.
3. Does 4 lo engage?
 
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  #3  
Old 09-17-2009, 10:21 PM
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kingfish. i am having the same problem with my 03 4x4. it is and electric shift the light comes on but doesnt engage in 4 hi but i her it clunk when it engages in 4lo but the front tires dont spin. u have a clue wht my problem might be.
 
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  #4  
Old 09-18-2009, 07:40 AM
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In exactly the same area as the other OP. Most failures with 4x4 on the 97-03 are the front axle not engaging.
This can be caused by:
1. Bad engagement solenoid
2. Vacuum line leak to the front axle vacuum motor.
3. Debris packed up around the vacuum motor so it can't turn.
4. Bad vacuum motor.
5. Broken shift fork.
 
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  #5  
Old 09-18-2009, 06:38 PM
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alright so i got under the truck today n saw the my tranny is engaging the drive shaft is turning and the little accuator is moving. i jacked up the front end and with the truck n 4hi i spun the front tire and the other tire didnt move. whats the cause of this. is it a busted hub or is it inside the pumpkin on the front axle?
 
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  #6  
Old 09-18-2009, 06:57 PM
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Geeze man, did you even look at the other thread?

Here, I'll help ~ https://www.f150online.com/forums/ot...90575-4wd.html
 

Last edited by jbrew; 09-18-2009 at 07:31 PM.
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  #7  
Old 09-18-2009, 08:01 PM
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i dont have a problem with the actuator so thats why i didnt bother reading it its eathier ther fork, the hubs or something inside the axle. when i got under to look at the fork going into the axle i noticed that there is no play in the shift fork when the actuator is in 2wd but when i switch to 4hi and the actuator pulls in i notice that there is play in fork to the point that i can almost pull the fork out of where it fits in the actuator. does this mean its broken?
 
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  #8  
Old 11-29-2009, 08:55 AM
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Does anyone have any photos on how and where the stuff to check is listed? Do alot of work on my own never ran into a problem with 4wd before. Can probably fix it if I knew where to look for the problems. Not dumb wife told me to ask. lol
 
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  #9  
Old 03-19-2013, 08:48 PM
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4x4 not working on 1999 f150

Originally Posted by kingfish51 View Post
In exactly the same area as the other OP. Most failures with 4x4 on the 97-03 are the front axle not engaging.
This can be caused by:
1. Bad engagement solenoid
2. Vacuum line leak to the front axle vacuum motor.
3. Debris packed up around the vacuum motor so it can't turn.
4. Bad vacuum motor.
5. Broken shift fork.
i got a 1999 f150 4x4 not working light for 4hi is on but nothing i replace gem mod and switch on the dash and still nothing can anyone help me
 
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  #10  
Old 03-19-2013, 08:53 PM
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got 1999 ford f150 need help light for 4x4 is on but not engage replaced switch on dash and gem mod still doing the same thing abs light is on dash mileage keeps going on and off need help tracking this down if anyone knows anything plz get back to me i love ford and will not get anything other then ford
 
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  #11  
Old 05-21-2013, 04:36 PM
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I have an 06 and the same thing. Actuators seem to engage, axle spins, plenty of vacuum but front wheels won't take off. I jacked it up and the wheel and axle spin by manually turning it but no grab
 
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  #12  
Old 06-06-2013, 08:58 AM
glc
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The 06 has a completely different 4wd system than the 99.
 
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  #13  
Old 10-08-2014, 12:29 AM
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i have a 99 f150 with a shift 4x4 with non locking hubs just bought the truck with 97,000 on her and you literally have to pull with all your might to put it into 4x4 high even with the truck in neutral. anyone have any solutions for the problem im having or is having the same issue? im new to the site and new to owning a f150.
 
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  #14  
Old 11-09-2014, 08:38 PM
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Originally Posted by Dvs4563 View Post
i have a 99 f150 with a shift 4x4 with non locking hubs just bought the truck with 97,000 on her and you literally have to pull with all your might to put it into 4x4 high even with the truck in neutral. anyone have any solutions for the problem im having or is having the same issue? im new to the site and new to owning a f150.
Mine did the same thing. All I did was find the shifter linkage under the truck and soak it with WD40 and move it back and forth until it freed up.
 
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  #15  
Old 11-10-2014, 07:49 AM
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Originally Posted by Steelerssteveo View Post
Mine did the same thing. All I did was find the shifter linkage under the truck and soak it with WD40 and move it back and forth until it freed up.
I had the same thing on my 99 F150. If you live in the salt belt and don't use your 4x4 very often the shift lever on the front differential will corrode up and be very difficult to move and be beyond the ability of the vacuum motor to move it.
What I did was to disconnect the vacuum motor from the lever and move it out of the way. I then put a piece of pipe about 18" long over the end of the lever, and while spraying PB Blaster around the bushing, I started working the lever back and forth. At first it was very tight and it took some time, but eventually enough working and PB that it loosened up to the point that it was smooth as silk.
I think one thing that is important, whenever you think about it, is to actuate the 4x4 while driving. Just flip it on long enough to engage it and flip it off. This will keep it loosened up so that it's available when you need it, especially if you live in the salt belt.
Deke
NE Michigan
 
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