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For me it doesn't open under idle ie. reving to 3k and letting off. When I got on the road and stepped on it in 3rd and then let off the gas I willhear the bov release.
Also I tried a very light spring the bov piston at idle was totally open and car would rough idle. Pinch the vacuum hose and the piston collapses.
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2008 335i E93, DP's, 7" FMIC, DCI,CP TIAL Q BOV, MHD Stage 2+, Alpina Flash
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