Question about Ford F-150

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I have a 2006 F150 4x4 and the four wheel drive on the fly dosn't engage all the time it's intermitten.

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Try changing the motor on tranfercase they go out if not used alot

Posted on Sep 28, 2008

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I would take it back to the delearship, with it being that new of a model. It's probably going to be in the buttons on the dash.

Posted on Sep 28, 2008

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1 Answer

On the fly four wheel drive goes in and out ...decides on its own when it wants to work or not - makes growly noise when going rom 2 wheel to four (regular four-not low four)


I am thinking the shifter linkage on the PTO has slipped. It is probably sitting between the two selection areas of the switch that controls the front hub engagement.

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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.

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
7418408.jpg

Sep 27, 2010 | 2005 Ford F-150

1 Answer

2004 ford fx4recently i dropped off in a rut on frontandwhen i engaged 4 wheel drive i heard a racheting noise.no four wheel drive now.mechanic told me it was cv joint but i dont understand how a little...


Sounds like the IWE ( Integrated Wheel End ) did not lock in for some reason.

Could be the IWE solenoid did not shut off the vacuum to the wheel ( usually the solenoid problem is the other way around ).

Could be the vent tube from the IWE into the engine compartment is plugged.

Also could be a problem with the transfer case.

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.

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
1f40571.jpg

Start with the lifting and supporting the front of the truck to check the front drive shaft when 4H or 4L is engaged to know which way to look.

Some times the connector on the transfer case for the ESOF version can be corroded and just needs to be cleaned.

Jun 23, 2010 | 2004 Ford F150

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.

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3 Answers

4x4 front end not engaging


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check the electric solenoid on the fly which diverts the vacuum to the front wheel to engage the drive shaft.Usually two solenoids located on the radiator panel.Check for broken vacuum hoses or leak

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1 Answer

Four wheel will not engage


you need to also check the relays that are in same circuit

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2 Answers

06 F150 4 four wheel drive wont work


I have a 1994 ford f150, my 4 wheel drive keeps trying to engage by itself even without me touching the automatic hub button....at time you can even hear it engaging and disengaging by itself, the low range light even comes on (dimly)...what could be the cause? the transfer case motor looks good and so does the wiring.

Nov 28, 2008 | 2006 Ford F-150

1 Answer

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The motor for the four wheel drive engagement on the transfer case is notorious for sticking, try pulling it out and then operating to see if it works.

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