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Thread: waste gate

  1. #1
    Join Date
    Jul 2015
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    usa/ohio/madison
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    5

    Default waste gate

    '04 6.6l LB7. Waist gate is stuck closed. It runs and drives perfectly fine. Hauls great. Intake tubes are after market by what I can tell. Idk if who might of had the truck before me did something to the waist gate to keep it closed for some reason. I took the vacuum line off to see if it would move but still didn't. Im not sure if it matters all the much though.

  2. #2
    Join Date
    Mar 2000
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    Loyal WI US
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    10,792

    Default

    The wastegate opens with pressure not vacuum. If you apply pressure via compressed air at the chamber it should open. Otherwise it will remain seated.

    CA LB7 trucks had a throttle in the intake that I believe was vacuum controlled.
    Kennedy Diesel-owner
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  3. #3
    Join Date
    Jul 2015
    Location
    usa/ohio/madison
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    Default

    Quote Originally Posted by Kennedy View Post
    The wastegate opens with pressure not vacuum. If you apply pressure via compressed air at the chamber it should open. Otherwise it will remain seated.

    CA LB7 trucks had a throttle in the intake that I believe was vacuum controlled.
    But shouldn't it still open if I try to move it manually?

  4. #4
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    It's held tightly closed with spring tension. It takes quite a bit of force to move it by hand. It takes more than 20 PSI compressed air to begin to open it. If it runs well, has good power and isn't setting an overboost code under heavy load acceleration, it's not an issue.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  5. #5
    Join Date
    Feb 2000
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    Montana
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