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Old 06-26-2019, 04:17 PM   #3
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Join Date: Jun 2016
Location: Quebec, Qc, canada
Posts: 93
Speed up until 40-50 mph then put in neutral and coast... Experiment by pressing and releasing the clutch pedal. Repeat but in 5 th gear without pressing the accelerator.

A failing air oil separator can also cause a hissing blowing noise. But this will follow the rpm directly.
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