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Old 06-04-2014, 09:30 PM   #1
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Default 4wd and vacuum lines

A few months ago i got stuck in the mud.... pretty bad. It rained the next day as i left it there and when i returned to get the truck it was sitting in a large puddle. After i got it out i looked under the truck for any problems and i noticed the hose was completely unplugged from the wheel hub on the passenger side. After it dried out i shot air through the hose and IWE solenoid, with dried mud flying everywhere. Currently it won't engage into 4WD. If i am correct without the solenoid working it will always stay in 4WD but when i shift the **** inside my truck to 4WD i hear clicking going on underneath, the usual, but its not in 4WD. If i remove the vacuum lines and shift into 4WD it works, but otherwise, it won't work. Does this mean that somewhere on the vacuum lines there is a whole i need to patch.
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Old 06-04-2014, 10:36 PM   #2
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No it is not a hole in a line. When 4x4 is engaged no vacuum is applied to the IWEs so a hole would only affect you when trying to disengage.

More likely the solenoid has an issue and is not shutting off vacuum upon engagement of 4x4.

You need a vacuum gauge to do some diagnosis. They can usually be borrowed from an auto parts store on a loan a tool program.

Check the vacuum line done at the IWEs to ensure that when the switch is in 4x4 that there is NO vacuum. If there is vacuum I would replace the solenoid. While you have the gauge check to ensure that both IWEs hold vacuum as well as the lines.
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Old 06-04-2014, 10:41 PM   #3
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Originally Posted by Dirttracker18 View Post
No it is not a hole in a line. When 4x4 is engaged no vacuum is applied to the IWEs so a hole would only affect you when trying to disengage. More likely the solenoid has an issue and is not shutting off vacuum upon engagement of 4x4. You need a vacuum gauge to do some diagnosis. They can usually be borrowed from an auto parts store on a loan a tool program. Check the vacuum line done at the IWEs to ensure that when the switch is in 4x4 that there is NO vacuum. If there is vacuum I would replace the solenoid. While you have the gauge check to ensure that both IWEs hold vacuum as well as the lines.
I noticed there are two hoses. What's the difference in those two?
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Old 06-05-2014, 01:53 AM   #4
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I noticed there are two hoses. What's the difference in those two?
Small one is the breather. Big one feeds the actual vacuum to the hub
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Old 06-05-2014, 07:41 AM   #5
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breather or vent line... you also need to check the check valves at the top of the vacuum line that run across the motor.
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Old 06-05-2014, 07:50 AM   #6
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http://www.f150forum.com/f72/how-dia...72/?styleid=14
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