Question about Cars & Trucks
No, check battery voltage with multi meter when engine running to be sure there are no other power problems as the cause
Posted on Jan 16, 2013
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Posted on Jan 02, 2017
SOURCE: 4 wheel drive
there is a way to do that.....all you have to do is go get the manual locking hubs and switch it over...not that hard....did it to a early 90s f150....pretty easy.
Posted on Sep 30, 2008
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:
This is a PDF version of the TSB on the IWE solenoid, so you have it handy :
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.
Posted on Dec 17, 2009
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
Here is a link to the TSB for the IWE solenoid in PDF format
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.
Posted on Dec 20, 2009
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