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How to test iwe solenoid - 2008 Ford F-150 SuperCrew

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My Ford is an 06 F-150. First it didn't come out of 4x4 good, now it won't go in and I'm pretty sure it tries to go in by itself in 2x. It will start to grind by itself on the drivers side front, then if I...


1st, pull the vacuum lines on the IWE ( Integrated Wheel Ends ) down on both front wheels. There are 2 hoses, 1 is the vacuum line to keep the IWE spring pulled out so the front axle is not engaged, the other is the vent line into the engine compartment ( not connected to any thing ).

The issue you have sounds a great deal like the TSB published for the IWE solenoid, where water can get into the vacuum system, and not completely disengage the IWE gear ( causing it to be part engaged, and ratcheting the teeth of the gears, wearing them down ).

The truck will feel like the parking bake is on, while the vacuum line is pulled ( you are pushing a dead axle ).

The vacuum line and IWE solenoid are easy to test with a vacuum gauge, to find out if it is the line, the IWE solenoid or the vacuum supply to the IWE solenoid.

The TSB in PDF format (right click save as : )
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Here is a block diagram of the IWE vacuum system
sscullys_125.jpg

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vacuum is removed the spring engages the IWE.

Mar 07, 2011 | 2006 Ford F-150

1 Answer

Stuck in 4h and won't go into 2h


Sound like the vacuum line is off the IWE solenoid ( on the firewall ) or there is a problem with the vacuum reservoir ( behind the battery box ).

The IWE solenoid controls vacuum to the IWE ( Integrated Wheel Ends ) to pull the hubs out ( spring loaded to push in without vacuum ).

You can pull one of the IWE vacuum lines ( the other line is a vent that leads into the engine compartment and is open ) and test with a vacuum gauge when the switch is in the 2H position, you should have vacuum on the line.

If not, you will need to trace back the vacuum lines to find where the leak is at ( if it is what I think it is ).

This is a block diagram of the vacuum system to work from ( not the physical routing ).
52db775.jpg

This is starting point, the other problems get into the IWE itself.

Jun 03, 2010 | 2006 Ford F-150

2 Answers

Vacume hubs i am looking for the air leak need vacume diagram for a 05 f150 supercrew


IF this is a case that the IWEs will not disengage, it could be the IWE solenoid or the vacuum lines to the IWEs. Could also be a problem with the vent lines from the IWE ( the other vacuum line that runs up into the engine compartment, and just hangs there ).

This is the block diagram of the vacuum lines for the IWE ( not actual routing ). You can use a vacuum pump / gauge to see if the lines will hold vacuum. Don't be surprised if the vacuum lines test OK, there is a TSB on the IWE solenoid where it could ingest water, and allow water in the lines, which will not keep the IWE gears disengaged.

Block diagram of the IWE system
b893440.jpg

TSB on the IWE solenoid ( right click save as )
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf


May 30, 2010 | 2005 Ford F-150

2 Answers

I turn the electronic switch and the 4 wheel drive does not engag


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
6cfa478.jpg

Here is a link to the TSB for the IWE solenoid in PDF format
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Start with testing to see if the front drive shaft turns while in 4WD to know which way do go with the repairs, the usual route is the IWE vacuum system ( lines or solenoids ), but I have seen shift motors be a problem also.
If you find a vacuum problem, you can remove and plug the vacuum lines at the IWE, and leave the front hubs locked in all the time, until you can diagnoses where the issue is at.
Just don't try racing anyone or expecting stellar acceleration , pushing a dead axle is going to consume some HP.

Dec 20, 2009 | 2006 Ford F-150

1 Answer

2005 Ford XLT 4X4 EXT CAB front axles are locking up intermittently even when I am not in 4 wheel drive. If I stop the vehicle and then proceed again it releases, but then the front axles will lock again...


Could be cracked vacuum lines to the IWE ( Integrated Wheel Ends ) or a faulty IWE solenoid.

The IWEs are held out with vacuum, and when 4WD is selected, the vacuum is shut off, the vent tubes relieves the vac as the spring engages the IWE gears.

I would lean towards faulty vacuum lines for the IWE system ( to the IWEs themselves, from the vacuum box, or the vacuum box itself ).
You can check them by disconnecting the vacuum line from the IWE, and checking with a vac gauge or apply vacuum with a pump.
Start with selecting 4WD ( engine running ) , so you can test to the IWE solenoid from the IWEs, and then work back towards the vacuum reservoir ( located behind the battery box ).

The IWE solenoid could be the problem, there is a TSB where the revision used on the 2004-2006 could ingest water, and introduce it to the IWEs, causing a problem.

Here is the block diagram of the IWE vacuum system:
c8ca6d8.jpg

This is a PDF version of the TSB on the IWE solenoid, so you have it handy :
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

If you do not have time to get to the testing right away, I suggest pulling the Vacuum lines to the IWEs, and capping them off. This will leave the IWE engaged ( front axle locked, but not beign driven ), do you don't have the engage, disengage problem, which could damage the teeth on the IWE gear. Just watch how fast you try to drive, the truck will not like pushing a dead axle at 95 mph.

Dec 16, 2009 | 2005 Ford F-150

2 Answers

Fourwheel drive noise when driving in 2wd noise whinning sound


This is a somewhat common problem with the 04-06 MY 4x4 trucks.

The IWE vac solenoid can ingest water, and introduce it to the IWE, or can develop a problem where it does not keep constant vac on the IWE ends, and the gears hang part in ( grinding ).

You can check the IWE solenoid to make sure it will supply VAC to the IWE ( vac keeps the IWE out, remove vac, and the spring will engage it into the gears ).

You can check the vac lines to the IWE, and the solenoid, but I hate to say the IWE solenoid needs to be replaced.

Here is a link to a PDF version of the TSB with the part number for the updated IWE solenoid that the 07& 08 MY trucks have.
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Here is a block diagram of the IWE layout, so you can check the vac lines. Hope it is as easy as a cracked vac line. Also check that the vent tubes are clear, and still up into the engine compartment.
c5b5f94.jpg

Dec 05, 2009 | 2004 Ford F150

1 Answer

2004 ford f150 supercrew will not engage in 4 wheel drive high or low, please help


Could be a problem with the vac lines to the IWE ( Integrated Wheel Ends ), or a problem with the IWE solenoid, or a problem with the vent from the IWE.

Start with checking the vac lines, to make sure they are not cracked.
The vac res & IWE solenoid are behind the battery. Here is a diagram of the parts in the IWE vac system
80605f9.jpg

There was a TSB for the 2004-2006 MYs with a bad design IWE solenoid, but this usually was coupled with noise in 2WD.
Start with checking the VAC lines and the vent, next would be to check the IWE solenoid.

Here is the PDF of the TSB on IWE solenoid
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Nov 28, 2009 | 2004 Ford F150

1 Answer

2004 Ford F150 supercrew will not go into 4 wheel drive, high or low, 86K miles, please help


Already replied to your other post on the same topic :
http://www.fixya.com/cars/t3532879-2004_ford_f150_supercrew_will_not_engage

Could be a problem with the vac lines to the IWE ( Integrated WheelEnds ), or a problem with the IWE solenoid, or a problem with the ventfrom the IWE.

Start with checking the vac lines, to make sure they are not cracked.
The vac res & IWE solenoid are behind the battery. Here is a diagram of the parts in the IWE vac system
e84e68b.jpg
There was a TSB for the 2004-2006 MYs with a bad design IWE solenoid, but this usually was coupled with noise in 2WD.
Start with checking the VAC lines and the vent, next would be to check the IWE solenoid.

Nov 28, 2009 | 2006 Ford F-150

1 Answer

4x4 switch doesn't work


Could be a cracked vacuum line to the IWE at the front wheels.

You can test with a vac gauge at the wheel to see if is there.

There is a vacuum reservoir box behind the battery box. This leads to a T on the firewall area. 1 end to the back of the intake w/ a check valve inline, the other end to a check valve to the IWE solenoid behind the battery on the firewall ( in the PCM area, those 3 large connectors ).

From the IWE solenoid the line runs to a t, and to each IWE.

I would start with checking for VAC at the IWEs, some times cracked lines do happen at the IWE. NExt would be the IWE solenoid if the fuse is good.

Nov 01, 2009 | 2005 Ford F-150

1 Answer

Transfer case is making a grinding noise in 2wd, when i put it in 4wd noise stops


Depending on how long the grinding has been going on, the IWE ( integrated wheel ends ) might need to be replaced.

The problem that causes the symptoms is either cracked vac lines from the IWE solenoid, or a faulty IWE solenoid.

Check the vac lines to the IWE, this is the block diagram of the setup
0ad583b.jpg

Use a visual inspection and vac tester ( might vac with a gauge on it ) to test the lines.

Sep 29, 2009 | 2006 Ford F-150

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