4wd drivetrain question

4wd drivetrain question

This is a discussion on 4wd drivetrain question within the F150 Ecoboost Problems forums, part of the F150 Ecoboost Forum category; I think this is a simple question, but figured I'd ask the experts. . . If an IWE or anything vacuum related to the front ...

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Thread: 4wd drivetrain question

  1. #1
    Ecoboost Pro DNA Dan's Avatar

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    4wd drivetrain question

    I think this is a simple question, but figured I'd ask the experts. . .

    If an IWE or anything vacuum related to the front hubs fail or gets unplugged, pinched, etc., it's my understanding you can be "stuck" in 4wd because the hubs will not disengage.

    In this scenario will the HUD show you are in 4wd? Even though the dash switch is not engaged?
    Also, will this always lead to a CEL?

    Reason I ask is I suspect one of my tires has the IWE engaged. Is this possible to only have one engagement?

    I know the test, just not very comfortable starting a vehicle on jack stands.
    2012 SCREW Eco FX4 Tuxedo Black, Fully loaded, Max Tow, 3.73 rear.
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    Ecoboost Veteran jibtechwarrior's Avatar

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    It will not notify you, no.

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    Ecoboost Master Envious's Avatar

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    Quote Originally Posted by DNA Dan View Post
    I think this is a simple question, but figured I'd ask the experts. . .

    If an IWE or anything vacuum related to the front hubs fail or gets unplugged, pinched, etc., it's my understanding you can be "stuck" in 4wd because the hubs will not disengage.

    In this scenario will the HUD show you are in 4wd? Even though the dash switch is not engaged?
    Also, will this always lead to a CEL?

    Reason I ask is I suspect one of my tires has the IWE engaged. Is this possible to only have one engagement?

    I know the test, just not very comfortable starting a vehicle on jack stands.
    Yes only one of my hubs got stuck. The vac lines go to each hub and if the IWE itself failed one will get stuck. I replaced the actuator and the check valve and that didn't fix it. So they replaced the IWE itself. My test was turn the wheel sharp in both directions and it chugged since it was in 4wd. When it was out I could easily make that turn.
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    Ecoboost Pro DNA Dan's Avatar

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    Did you have any codes show up?
    2012 SCREW Eco FX4 Tuxedo Black, Fully loaded, Max Tow, 3.73 rear.
    ARE Z-Series topper w/Yakima rack, Bilstein 5100's, StopTech Sport brakes, BFG T/A KO2 on stock rims, RXP Catch can w/UPR check valves, FR Gen 2 Radiator, Saudi Trans cooler, CR Performance Engineering exhaust manifolds, Firestone Air bags.

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    Ecoboost Master Envious's Avatar

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    if I ever find any cracks in my hoses I think this will fit
    https://forged-offroad.com/product/2...v=7516fd43adaa
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    Eco-Beast mass-hole's Avatar

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    Quote Originally Posted by DNA Dan View Post
    I think this is a simple question, but figured I'd ask the experts. . .

    If an IWE or anything vacuum related to the front hubs fail or gets unplugged, pinched, etc., it's my understanding you can be "stuck" in 4wd because the hubs will not disengage.

    In this scenario will the HUD show you are in 4wd? Even though the dash switch is not engaged?
    Also, will this always lead to a CEL?

    Reason I ask is I suspect one of my tires has the IWE engaged. Is this possible to only have one engagement?

    I know the test, just not very comfortable starting a vehicle on jack stands.
    I would think you could just raise the tire in question and turn it by hand and see if the shaft rotates with it.
    Ecobeast matt likes this.
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    Ecoboost Veteran tvsjr's Avatar

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    Quote Originally Posted by DNA Dan View Post
    it's my understanding you can be "stuck" in 4wd because the hubs will not disengage.
    Technically you wouldn't be stuck in 4WD, as the transfer case will still be in 2WD mode. However, the CV shafts would be locked into the wheels. Since you aren't driving the front axle, you won't experience binding.

    The RCV IWE eliminators work by doing exactly this... permanently locking things together and removing the ****ty IWEs from the equation.
    Blown F-150 and Ecobeast matt like this.

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    Ecoboost Regular BigPhatPaulie's Avatar

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    Quote Originally Posted by DNA Dan View Post
    Did you have any codes show up?
    There is no sensor for the 4wd on the hubs so it will not show codes as a result. I think it will only do that for the t-case (just a guess)
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    Ecoboost Veteran Ecobeast matt's Avatar

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    Quote Originally Posted by tvsjr View Post
    Technically you wouldn't be stuck in 4WD, as the transfer case will still be in 2WD mode. However, the CV shafts would be locked into the wheels. Since you aren't driving the front axle, you won't experience binding.

    The RCV IWE eliminators work by doing exactly this... permanently locking things together and removing the ****ty IWEs from the equation.
    I did my iwe eliminators yesterday totally worth it


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  11. #10
    Ecoboost Veteran Ecobeast matt's Avatar

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    I did the iwe eliminators yesterday and plugged the vacuum lines and when I go to my truck apps it says I’m in 2wd as normal even though everything is turning except the transfer case


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