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  1. #1
    Jr. Apprentice
    Join Date
    Feb 2008
    Location
    Edmonton Alberta
    Posts
    13

    Question Turbo Charger Not Boosting

    I have an '04 3500 Siverado with 6.6L Turbo Diesel. The problem is the turbo charger is not showing any boost. The truck is equipped with a boost gauge, so not only can I see no boost pressure, I can certainly feel the truck is down on power. This problem has occurred twice in the last couple of weeks. It has been quite cold (-20C or -4F) lately and this may be the cause.

    But I'm wondering if anyone else has seen this problem?
    Bentley

    1986 GMC 2500
    1998 GMC Jimmy 1500
    1996 Silverado 1500
    2000 Tahoe (current)
    2004 Silverado 3500 (current)
    2011 GMC Yukon Denali (current)

  2. #2

    Default

    are you smoking alot? If you weren't boosting you would probably be pouring black smoke. Boost gauges can be installed wrong and can get screwed up by very cold weather. My friend had a similar problem at school with his wrx.
    Dan
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

    If you have any questions or problems don't hesitate to send me or any other GMTC moderators a PM

  3. #3
    Jr. Apprentice
    Join Date
    Feb 2008
    Location
    Edmonton Alberta
    Posts
    13

    Default

    Both times it happened at night so I didn't notice if it was smoking. The boost & EGT gauges are both working fine. The engine seems to run okay as well. Just no power. So far, it's been an intermittent issue. I'd sure like to know if this is just something caused by the cold or if I'm about to be staring at a bigger problem...

  4. #4
    Moderator

    dwill3015's Avatar
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    Jan 2007
    Location
    Yacolt, Washington
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    4,338
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    Default

    Welcome to the site! Are you throwing any codes at all?
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  5. #5
    Jr. Apprentice
    Join Date
    Feb 2008
    Location
    Edmonton Alberta
    Posts
    13

    Default No Boost

    Nothing. I will hook it up to a diagnostic unit and see what comes up.
    Thanks

  6. #6
    Legend

    Join Date
    Jun 2006
    Location
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
    Posts
    1,613

    Default

    This is a crude guess, but Is it possible for the waste gate or pop off valve to get stuck open by the cold. Maybe it can get iced frozen open??

    Strictly a guess and I'm not even sure how boost is regulated in a modern motor.

    Happening at night-when it is coldest- might favor the frozen open theory? Maybe you could take a propane torch to whatever regulates boost-? If it works after heating??

    Luck,
    Charlie
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  7. #7

    Default

    I had icing problems with one of my trucks last winter in real cold weather, the pop off was icing up and sticking open, as noted it was accompanied by heavy smoke. Havent had problems yet this year, but the truck hasnt been in real cold weather yet this year.
    The turbo was spinning and making boost but everthing was being dumped, a couple times it got so bad the truck almost died.

  8. #8

    Default

    Another possibility is that the motor might be going into limp mode (not sure how the ECU is set up on these trucks). I know with my Evo, I would get over boost scenarios in the cold weather and it would throw the ECU into limp mode.

    If that's not the case, than I would look into the dump valve (pop off valve?) and waste gate being stuck opened. Can you hear the turbo spooling up at all?
    Scott

    ΜΟΛΩΝ ΛΑΒΕ

    '94 Chevy Suburban K1500
    3" exhaust w/ aero turbine non-baffled muffler
    CFM Technologies TB spacer
    CB w/ 44" whip antenna


  9. #9
    Jr. Apprentice
    Join Date
    Feb 2008
    Location
    Edmonton Alberta
    Posts
    13

    Smile

    Well thank you all. It does appear to be a freezing problem. The turbo is spooling up but the waste gate is sticking open. Needs to thaw, dry up & a little cleaning.

    Aloha from the Great White North...

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