Hi folks:
My turbo are has a high pitch whistle that was narrowed down to the Air recirculation valve( not the EGR valve) on top of the turbo. I plugged the ARV at the rubber connector by a ball bearing, ( EGR is already blocked). The whistle is gone only the regular turbo sound.
My Q is does blocking the ARV have bad effect on performance or mechanical wear on turbo unit??

MVK

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1985 300D Turbo 179,000miles