Question about 1998 Ford F150 2DR Extended Cab Duraflex Platinum Side Skirts - 4 Piece

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Front differential not engaging on my f150 msof

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Check the oil level may be low.

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My 2000 ford f150 4.6L 4x4 will only go into 2nd gear!! how come??


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

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 you will find the front drive shaft does not turn, and the issue is with the vacuum shift motor, the vacuum lines to it or the solenoids that operate it ( could be the vacuum reservoir, small chance ).

The vacuum disconnect motor is on the front axle, item #10 in the picture below :
sscullys_3.gif

Picture of it
sscullys_66.jpg

The 2 vacuum lines to it change between 2WD and 4WD operation. You should have vacuum on the pink vacuum line when in 2WD mode and the light blue vacuum line when in 4WD operation.

If a test with a vacuum gauge does not show vacuum, chances are the vacuum line is cracked.
It is this simple.
sscullys_67.jpg

If you do not have vacuum on either line, it could be the fuse to the solenoids is blown ( power is always at the solenoids, ground is operated by the GEM - Generic Electronics Module ) or it could be the vacuum reservoir behind the battery is cracked adn causing a vacuum leak.

Start with checking the fuse for the system, and verify if the front drive shaft engages and go from there.

Dec 22, 2010 | 2000 Ford F150 Flareside SuperCab

1 Answer

I have a ford f 150,v8 engine and my 4 wheel drive wont work now, can it be just a fuse?


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

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 does not turn, and the issue is with the vacuum lines for the front axle.

You can check the vacuum lines with the engine running, and have a vacuum gauge on the front disconnect motor. Pink line is 2WD operation ( unlocks the front axle ) Light Blue is the 4WD operation ( locks the axle ).

The disconnect motor is on the front axle, item #10 in the picture below
sscullys_2.gif

Picture of it.

Dec 10, 2010 | 1998 Ford F150 Regular Cab

1 Answer

I had my 2005 ford f150 service.. new pads in all four and a new rear calliper. Now the 4x4 wont engage. I check all the fuses,relays and they are good. I got under the truck and tap the selenoid but...


What solenoid under the truck did you tap ?
There is a transfer case under the truck, and the IWE solenoid is in the engine compartment on the firewall.

Did the Vent an vacuum lines get reversed ?

Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

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.

Nov 07, 2010 | 2005 Ford F-150

1 Answer

I am having trouble shifting into 4X4. The shift is stiff. When I shift it to 4X4 the indicator shows it is in 4X4 but it isn't. I only bought the car in August.


ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) system ? ( sounds to be MSOF ).

If this is a New Body Style 2004 ( not a 2004 Heritage )
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
c3af49b.jpg

If this is a 2004 Heritage , the system is a bit different, just post a comment back and I can update the solution.

Oct 20, 2010 | 2004 Ford F150

2 Answers

98 f150 won't engage in 4wd


For the 1998 MY the front axle uses a vacuum shift motor

Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?


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 problem is with the front axle engagement, check that the shift motor is operational

ce890ba.jpg

This is on the front axle. If it does not move, it could be a problem with the vacuum lines or the vacuum diaphragms.
6b742b6.jpg

The vacuum should be applied to the pink line if you are in 2WD, and the blue line when in 4WD.

Obviously check the fuses if you have the ESOF versions, to make sure the transfer case shift motor is operational.

Aug 18, 2010 | 2004 Ford F150

1 Answer

I have a 2003 f150 4x4 and the front tires are not engaging. Have replaced the ac-curator and the shift fork assembly in the front differential. And fixed 6 vacuum leaks. The 4x4 is a manual shift with...


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 don't want to assume that the front axle works correctly, but it sounds like you got past that bit of testing.

Aug 18, 2010 | 2003 Ford F150 Regular Cab

1 Answer

2006 F-150: 06 ford f150 will not go into 4wheel drive...


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.
Usually the problem ( with 04-08 MY ) is the front axle will not disengage.

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. Actually any time the truck is not running, after the vacuum bleeds out, the front IWEs will engage while it is parked.

Here is a block diagram of the IWE system
64f8118.jpg

If the front axle turns, the shift motor ( on the ESOF ) would be the issue. Some times the connector on the back of the transfer case gets corroded and needs to be cleaned. Other problems could be a hung up shift motor, some have tapped on the back of the transfer case to free it up again.

May 16, 2010 | 2006 Ford F-150

1 Answer

4x4 on my 2005 f150 will not ingage


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ? 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.

Mar 12, 2010 | 2005 Ford F-150

3 Answers

4x4 front end not engaging


my computer problem is hard disk system found warantty hard disk

Feb 24, 2010 | 2006 Ford F-150

1 Answer

4x4 wont engage


thier is a shift fork in the front differential that engages the front axles. this is commonly broke.

Dec 17, 2008 | 2000 Ford F150 Flareside SuperCab

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