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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 01-26-2012, 05:12 PM
theduke308 theduke308 is offline
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NO VACUUM FROM ENGINE TO 4wd Solenoid

I have no vacuum coming from the engine to the IWE solenoid. This is making my hubs stay locked all the time. Can someone help me with where this line from comes from and how to fix this. Which line is the line from the engine, the one with the T in it or the other one?
5.4L V8 2004 New Style
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Old 01-26-2012, 07:11 PM
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Check out this thread on the IWE system. It should be more than enough information to get you started with troubleshooting. http://www.ford-trucks.com/forums/83...then-some.html
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Old 01-26-2012, 09:33 PM
theduke308 theduke308 is offline
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It was a bad check valve but the hubs still will not dis engage from the wheels
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Old 01-26-2012, 09:40 PM
Rebuild101 Rebuild101 is offline
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Reverse the vacuum lines on the vac silnoid to disengage the front dif
This worked on my 99 f150
Hope this helps
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Old 01-26-2012, 09:56 PM
theduke308 theduke308 is offline
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I think on the "new and improved" f150s the vacuum is needed to unlock them
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Old 01-26-2012, 10:30 PM
Rebuild101 Rebuild101 is offline
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Maybe is there 1 or 2 vac swiches for the front end?
One for engage and one for disengage
How cold is it I have seen the vacuum motor on the dif freeze due to moisture in the system
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Old 01-26-2012, 10:30 PM
 
 
 
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