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Thread: No Boost

  1. #11
    Join Date
    Nov 2004
    Location
    North Weald, Essex
    Posts
    96
    Could it be the Cycle Waste Valve?

    Turbo Cycle Valve Waste Gate control suitable for both fortwo and roadster.

    The wastegate opens at a lower boost pressure to that governed by the electronic cycle valve/solenoid on a smart. Thus, should the cycle valve fail on your vehicle you will experience lower boost pressures and hence lower performance levels; often referred to as a form of "safe mode" or "limp home mode".

  2. #12
    Join Date
    Feb 2011
    Location
    Lewes
    Posts
    702
    Now to throw a real spanner in the works!

    We had a frost last night. Today, I have boost back again! I expected to lose boost again as I thought the problem must be a sticky waste gate spindle and that the cold had created free movement again. I could move it yesterday without too much trouble so it wasn't "Stuck completely".
    As I say, I thought it would lose boost again when it warmed up, but it has continued to work all the way to work and back again this evening. Approx 34 miles round trip. So plenty of time to get hot.

    So thank you all for your help such as it was.... It appears not to be an issue right now. (bet that jinxed it!)

    John

  3. #13
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,160
    Good lubricunt needed I think.
    Drives a Smart Cdi - 65 to 85 MPG

  4. #14
    Join Date
    Feb 2011
    Location
    Lewes
    Posts
    702
    Any recommendations?

    John

  5. #15
    Join Date
    Jan 2011
    Location
    uk
    Posts
    780
    Quote Originally Posted by tolsen View Post
    lubricunt
    You're so money supermarket and you don't even know it!

  6. #16
    Join Date
    Jan 2011
    Location
    uk
    Posts
    780
    You're so money supermarket and you don't even know it!

  7. #17
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,160
    Quote Originally Posted by Heinkeljb View Post
    Any recommendations?

    John
    The problem is the waste gate actuator on the petrol 450 is made from substandard poorly plated carbon steel. Rust sets in and waste gate rod and pivot will seize. Remedy: Replace actuator or apply graphite containing penetration lubricunt and hope for the best.
    Drives a Smart Cdi - 65 to 85 MPG

  8. #18
    Join Date
    Mar 2010
    Location
    Hampshire
    Posts
    1,978
    I doubt it is cycle valve related as if it was, disconnecting & reconnecting the battery would have seen your boost return, even if only briefly.
    I would go with WGA as Tolsen says, or a seized turbo is another possibility.
    ==============================
    2004 Roadster-Coupe SB2 Brabus
    2005 ForTwo Brabus Numeric
    2014 Skoda Yeti 4x4 DSG
    ex 2002 City Coupe 600cc Pulse
    ex 2003 City Coupe 700cc Passion
    ==============================

  9. #19
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,160
    Waste gate actuator on a front engine car is much better protected from the elements. UnSmart of Smart to fit such a poorly corrosion protected beast at the rear of the 450.
    Lucky for me they used stainless steel when making waste gate mechanism for the diesel 450:

    Actuator rod, nuts and arm are all stainless steel. Only once about 15 years ago did I as a precaution apply some lubricunt where rod enters actuator pot.
    Drives a Smart Cdi - 65 to 85 MPG

  10. #20
    Join Date
    Jan 2011
    Location
    uk
    Posts
    780
    Quote Originally Posted by tolsen View Post
    lubricunt
    Quote Originally Posted by tolsen View Post
    lubricunt
    Quote Originally Posted by tolsen View Post
    lubricunt
    It's not spelt that way you ****
    You're so money supermarket and you don't even know it!

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