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k20 ctr engine hiss noise

  1. Faults K20 engine problem: help me in diagnosing this sound!

    Engines and Transmission (8G)
    Since a bit of time I have a really annoying high pitched noise coming from the engine. It's completely tied to revs, and persists when clutch is disengaged (so it's not coming from the gearbox). About six months ago (maybe a year) the sound was less strong, and I brought it to the dealer who...