2007 Expedition vacuum line front end?

[NIGHTLIFEphantom]

Hey guys! A few weeks ago I developed a humming noise on my front driver side. I then crawled under and noticed 2 vacuum lines, 1 from the passenger side and one from the drivers side both meeting to the middle with nothing connected to them. They both have the flared type ends looking like something is supposed to connect them together possibly? I’m not too sure... for now I just inserted a small piece of blue tubing that I had laying around but it still not get rid of the humming?

Can any of you guys send me a pic of what yours looks like underneath?

I do have 4x4.

 

[mnachreiner86]

Hey guys! A few weeks ago I developed a humming noise on my front driver side. I then crawled under and noticed 2 vacuum lines, 1 from the passenger side and one from the drivers side both meeting to the middle with nothing connected to them. They both have the flared type ends looking like something is supposed to connect them together possibly? I’m not too sure... for now I just inserted a small piece of blue tubing that I had laying around but it still not get rid of the humming?

Can any of you guys send me a pic of what yours looks like underneath?

I do have 4x4.

That’s the the vacuum harness for the 4x4 IWE system. Vacuum is applied in 2hi causing the IWEs to not engage the wheel hub and released in 4x4 causing the IWEs to engage the hub. The humming you’re hearing is the IWE trying to engage because of the leak in the line. You need the appropriate vacuum connector to repair the harness and you’ll be good to go after repairing the leak.


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[07navi]

You need to fix that before you ruin your hubs.

 

[NIGHTLIFEphantom]

That’s the the vacuum harness for the 4x4 IWE system. Vacuum is applied in 2hi causing the IWEs to not engage the wheel hub and released in 4x4 causing the IWEs to engage the hub. The humming you’re hearing is the IWE trying to engage because of the leak in the line. You need the appropriate vacuum connector to repair the harness and you’ll be good to go after repairing the leak.


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Any idea what the connector should look like or a part number or possibly a picture?

 

[tommyddsr]

Is this picture taken directly under your fan shroud?

 

[NIGHTLIFEphantom]

Is this picture taken directly under your fan shroud?

Correct.

 

[mnachreiner86]

Any idea what the connector should look like or a part number or possibly a picture?

You can get a tight rubber vacuum connector that will keep it from leaking down or purchase the entire vacuum harness. I’m not sure if Ford makes sells that piece individually but I could be wrong.


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[tommyddsr]

Here is a picture of mine (2009). As you can see there is a rubber coupling. It is thick rubber and the vacuum lines are glued in. I did not trace the other ends.

 

[tommyddsr]

It looks like you need the whole assembly since the setup is glued at the factory. Only $50 on Amazon for OEM lines.

 

[Bigfishfin]

That’s the the vacuum harness for the 4x4 IWE system. Vacuum is applied in 2hi causing the IWEs to not engage the wheel hub and released in 4x4 causing the IWEs to engage the hub. The humming you’re hearing is the IWE trying to engage because of the leak in the line. You need the appropriate vacuum connector to repair the harness and you’ll be good to go after repairing the leak.
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This brings up a question I have had regarding a work around if the vacuum lines fail for some reason. In that case, can't AWD or 4WD be activated so that the hubs do engage and not be damaged until the IWE system can be repaired? PS: I admit to being ignorant as I have never had my IWE system fail and therefor have never worked on it. Just trying to be proactive. Thanks!

 

[justinp16ex]

This brings up a question I have had regarding a work around if the vacuum lines fail for some reason. In that case, can't AWD or 4WD be activated so that the hubs do engage and not be damaged until the IWE system can be repaired? PS: I admit to being ignorant as I have never had my IWE system fail and therefor have never worked on it. Just trying to be proactive. Thanks!

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

 

[justinp16ex]

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.

 

[mnachreiner86]

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.

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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[Bigfishfin]

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

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?

 

[justinp16ex]

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?

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.

 

[tommyddsr]

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.

 

[mnachreiner86]

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.

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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