Check your 4x4 IWE system

-J- said:

Im not sure what some folks are saying here. The IWE system doesnt affect the transfer case of diff, just the hubs. They are either locked or unlocked. This just reduces wear and drag when in 2wd vs 4wd or Auto mode. There would be no benefit to put it in any mode if the IWE system fails. Ive see the IWE deletes but I prefer to be able to unlock the hubs for my 99% street driving style.

I dont think the actuator effects anything besides the IWE, its not directly attached to the brake booster so shouldn't affect That system. Mines completely unplugged as seen in the picture but worked just fine. I am just stuck in 2wd mode until my new actuator shows up.

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zombiekiller said:

see how two of the vacuum hoses that usually attach to the solenoid are pushed together (eliminating the solenoid) to prevent a vaccum leak? If those two hoses come apart. you will have ZERO brake booster vacuum.

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-J- said:

I put them like that to unlock my hubs. Have you check for the gen 2 raptor to make sure thats correct information? The IWE is a closed system and only breaks off to go to a vacuum reservoir.

here is the parts diagram and the pdf from ford.


https://www.quirkparts.com/oem-part...MIltzG65rU5gIVUT0MCh1qxwB4EAQYAiABEgLibfD_BwE


Also this TSB
https://static.nhtsa.gov/odi/tsbs/2018/MC-10149748-9999.pdf

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zombiekiller said:

I experienced it first hand when the solenoid fell off the brake booster on a desert run on my truck. The solenoid has to draw its vacuum from somewhere. Apparently, it draws it from the same vacuum reservoir that the brakes use.

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Jim_W said:

@zombiekiller - I "think" most of the failures are not a complete loss of vacuum to the IWEs. Thus you get intermittent grinding as you are driving in 2H. At least that was my symptom and most that I saw on the web (but guessing most that have complete failure won't notice unless the get an on truck balance or notice gas milage)....

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Erjdrvr said:

Besides grinding, what are the other symptoms of a malfunctioning IWE system?

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