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2007 Expedition vacuum line front end?

Discussion in '3rd Gen - 2007 - 2017' started by NIGHTLIFEphantom, Apr 15, 2021.

  1. justinp16ex

    justinp16ex Full Access Members

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    4 Auto would be the better temporary solution if you needed to do that. That engages the IWE's, but not the 4wd system.
     
  2. justinp16ex

    justinp16ex Full Access Members

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    I believe there is two fittings on the hub one is for the vacuum into the IWE the other is dead, you might be able to disconnect the lines and plug the vacuum line into the dead fitting if it fits. That would engage the IWE's and cap off the vacuum lines at the same time, if you don't have Auto 4, but you'd want to do that on both sides.
     
  3. mnachreiner86

    mnachreiner86 Full Access Members

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    It’s a vent line. The IWE system has been around since 04 with few changes, I’m not the biggest fan compared to the old system and they have some issues but generally nothing is going to catastrophically fail immediately to destroy things. Usually it’s a weak/leaking IWE diaphragm or solenoid/check valve. All cheap and easy to fix and is not going to permanently damage the hub/knuckle unless it goes on for a very long time and you ignore it. I wouldn’t worry much about it until it needs the attention.


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  4. Bigfishfin

    Bigfishfin Full Access Members

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    My bad, I just checked the truck and you are correct is referring to the setting as 4A (4 Auto)...This brings up another question in that you state that 4A engages the IWE's, but not 4WD...I assumed that 4A would automatically activate 4WD when the truck sensed traction loss, am I wrong? Again I throw myself on the mercy of the court and my defense is ignorance. Thanks!...

    PS: I have read posts where some folks keep the setting at 4A continuously (at least in winter) and is that a good or poor practice as far as system wear or?
     
  5. justinp16ex

    justinp16ex Full Access Members

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    4WD will engage when there's wheel slip. Would for sure but gas mileage a bit, not sure about excessive wear. If you have more parts moving than normally would be then there would be some kind of wear somewhere.
     
  6. tommyddsr

    tommyddsr Full Access Members

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    My 2000 Expy was 4A, 4L and 4H. 160K miles in 4A and nothing is worn out or damaged. They are designed to run this way.
     
  7. mnachreiner86

    mnachreiner86 Full Access Members

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    Same. My 2000 had 205k when I sold it and solid as a tank. V8 4th gen 4Runners are set up the same way. Some people ran into problems and hence the brown wire mods, but I never had issue with mine.


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