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Thread: Turbo not boosting

  1. #11
    Join Date
    Mar 2010
    Location
    Hampshire
    Posts
    1,985
    Have you tried disconnecting / reconnecting the battery to reset the ecu?
    ==============================
    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
    ==============================

  2. #12
    Join Date
    Oct 2009
    Location
    Stourbridge
    Posts
    7
    OK, So i having taken all of the back end of the car off I opted to reset the electronics which appears to have solved the problem

  3. #13
    Join Date
    Mar 2010
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    Hampshire
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    Dud you not take in my earlier posts then? That narrows the issue down. If it happens again then you can be fairly sure it's a faulty cycle valve. Could also be the MAP sensor but this normally throws the EML light on.

    I have had to replace my cycle valve twice for the exact same fault.
    ==============================
    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
    ==============================

  4. #14
    Join Date
    Oct 2009
    Location
    Stourbridge
    Posts
    7
    I did take your other posts, but took half the car off before reading it could be the safety mode.

    I think it is the cycle valve as its now working but the boost is slightly irregular and squeals every now and then as if the air is passing through cleanly.

    Is this likely to be the cycle valve?

  5. #15
    Join Date
    Mar 2010
    Location
    Hampshire
    Posts
    1,985
    Not sure about the noise but irregular boost is indeed a symptom of a failing cycle valve. If it over-boosts it basically trips the car into safe mode to save your turbo from damage and then you have no boost at all.
    ==============================
    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
    ==============================

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