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Hit and miss boost HELP

Discussion in 'A4/S4 forum(B5 Chassis)' started by Si22A4, Jul 15, 2012.

  1. Si22A4
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    Si22A4 New Member

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    [Jul 15, 2012]
    I had no boost with a fault of low boost pressure. Had my turbo re-conditioned new de cat pipe and everything works fine sometimes. If you accelerate sometimes there's no boost if you let of the throttle and go back on boost is there. Changed the boost sensor and still the same problem. Do you think this is electrical fault or mechanical ? My car is Audi A4 115 se 2000 model. Many thanks
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  3. AudiiduA
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    AudiiduA Member

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    [Jul 19, 2012]
    N75 or MAP sensor!
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  4. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 20, 2012]
    check all the vacuum pipework is intact with no splits/leaks and make sure the VNT actuator on the turbo is free to move.

    If those check out then look at a new N75 valve.
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  5. Si22A4
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    Si22A4 New Member

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    [Jul 20, 2012]
    Thank you
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  6. Si22A4
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    Si22A4 New Member

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    [Jul 20, 2012]
    I think it might be something to do the vacuum pipes as there was a big rumble and its blown off my exhuast gasket, what do you think? many thanks
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  7. Si22A4
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    Si22A4 New Member

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    [Jul 20, 2012]
    I had a problem and it blew off my exhuast gasket. do you think this has something to do with the vacuum pipes?
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