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by jag652344 on February 14th, 2004

jag652344

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The boost in my 2000 Subaru that occurs around 3000 rpm now oscillates and is not consistent as it was. What could be wrong?

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Answers. 2 helpful answers below.

  • by Anonymous on August 6th, 2006

    Anonymous

    Try cleaning the boost control valve and associated hoses. Blow by oil gathers in the BCV lines and can cause boost surge.
    There is also a restrictor olive that can become blocked. It lives in a T off the Wastegate just before the BCV. Its approximately 1.2mm ID, check its clear.

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  • by Shabba on September 26th, 2005

    Shabba

    My first thought is the wastegate could be playing up - if it opens before it's meant to, it will let exhaust gas past the turbine, which means your turbo won't be powering properly, which will cause a boost drop. Either that or your blow-off valve is faulty. Either way, I'd say one of your pressure-controlling valves is letting air leak when it shouldn't.

    I could be wrong, though...

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