Question about 2004 Ford F150

1 Answer

My 2004 f150 does not always work in 4 wheel drive but I replaced a vacuum line that goes to the front acuator on the front axel, then i replaced the right front hub assembly with a used one and the 4 wheel drive seemed to work fine,but the used hub was warped so i put the old one back on temporaraly and now the four wheel drive does'nt work. how does the hub affect that. need to know. mike m,

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 984 Answers

The IWE is operated by a common vacuum system. When you say does not work, not sure what you are getting at ( only 1 wheel locks into place, or neither ).

Could be you had the vent and vacuum lines reversed, and this did not keep the IWE gear pulled out and it rounded off on the one you did not replace.

Is the issue the front axle does not lock in, or does the drive shaft not lock in at the transfer case ?

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.

When you get to this point, post back a comment to this problem with the info.

Posted on Nov 13, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

4x4 not working

your front axle has a vacuum pot on the back side. make sure your getting vacuum in four high. if not there is a vacuum switch on your transfer case that could be faulty or the supply line for vacuum from the motor could be broken.

Nov 25, 2013 | 1991 Dodge Ram 150

1 Answer

2000 model F150 4wd. Issues with vacuum solenoids to control front diff. Tested so far, transfer case will lock in front drive shaft when 4WD is selected - front wheels still free. Applying vacuum to the...

replace the 4 wheel drive acuator if in 4wd with selector and the wheels are still free then the acuator is bad even tho you 12v the acuator may not be pulling back to lock in the hub for 4 wd. simply replace it as their is a small spring on the acuater that over time becomes week and can no longer hold the presure that is created when it activated.

Aug 01, 2011 | Ford F-150 Cars & Trucks

1 Answer

2005 f150 front hubs noisey goes away when put in 4 wheel drive then back in two.

This is either the IWE ( Integrated Wheel Ends ) solenoid or the vacuum lines / check valve / reservoir for the vacuum system

This is a block diagram of the IWE vacuum system

There is a TSB on the IWE solenoid for the 04 to early build 06 MY F-150s ( right click save as )

This is for the early build where water can get into the IWE vacuum system, causing weak vacuum at the IWE, and the spring is part engaging.

With the engine running, pull the IWE vacuum line ( not the vent line ) and measure vacuum, to make sure it is being applied. This is done with the Mode selector switch in 2WD and the engine must be running ( in park, take safety precautions, chock wheels, parking brake, etc )

Until you can get it fixed, pull the vacuum lines on the IWE ( make sure it is the vacuum line, not the vent line that runs into the engine compartment, and just hangs up there ).
This is so the IWE gear is not being ground down while driving it. The front axle is engaged when you do this, so MPG will suffer, but the truck is just pushing a dead front axle, the transfer case is not turning the front shaft. This is just to try to minimize further damage to the IWE gear ( which can cause a need to replace the IWEs ).

Dec 12, 2010 | 2004 Ford F150

1 Answer

2004 ford f150 4 wheel high will not engage 4 low will has manual shift

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

Nov 28, 2010 | 2004 Ford F150

2 Answers

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

It is item #10, on this parts diagram
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

Jan 04, 2010 | 2000 Ford F150 Flareside SuperCab

1 Answer

I have a 93 s-10 blazer the 4 wheel drive is not working i think its a vacuum line where are they located

There is three vacuum line on the driver side, top of the transfer case. One comes from the engine, 2nd line goes to the breather vent, 3rd goes to the 4x4 actuator diaphragm. The 4x4 actuator is located under the battery tray, check the vacuum line and listed for any vacuum leaks at the acuator. Inspect the cable from the actuator to the front differential (pumpkin), it's common for the cable clip on the pumpkin to corrode and will need to be replaced. Good luck and keep me posted.

Nov 08, 2009 | 1993 Chevrolet S-10 Blazer

5 Answers

4/04 ford f150 4x4 front axle actuator won' t stay disengaged

Even though you checked the vacuum lines and found no leaks it does not mean there isn't a problem. The check valve in the line closest to the firewall actuator is probably your problem. Had the same issue replaced this line and solved it. The check valves in the vacuum lines are your best next guess.

Jun 09, 2009 | 2004 Ford F150

2 Answers

Front drive, 4 Wheel drive won't engage

that vacume line goes back to the transfer case, the end that goes behind the motor hooks to a steel tube so it does not get hot from the exhaust., my guess it should be hooked up so it will feed vacume to the vacume ball so it can lock in the axels. if you start the car and shift into 4 wheel drive and listen under hood you should hear a hissing sound, that is vacume, if you can't hear it there, you may have to craw under the right side to hear it, probably came unhooked underneith the car

Feb 01, 2009 | 1995 GMC Jimmy

2 Answers

88 Jeep Cherokee 4 Wheel Drive Problem

It sounds like the vacuum acuater is cracked or broken internaly. Recomend replacing the acuater and replacing all vacuum hoses at the same time. There is also a small relay switch under the hood under the radiator tank that may also require replacing.

Dec 21, 2008 | 1988 Jeep Cherokee

1 Answer

When i shift in to 4 wheel drive it gears down but front wheels dont spin and the vac line frome front axel is got a screw in it where dose that hose connect to under the hood

the front acuator on the axle is bad the part goes from used 55.00 dollars to 179.00 brand new oem and is real easy to put on

Dec 17, 2008 | 1995 Chevrolet K1500

Not finding what you are looking for?
2004 Ford F150 Logo

483 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

79077 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

5677 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides