My smoking issue started just like yours. First I found a torn CCV membrane. Replaced both CCV's, then the red light smokehouse disaster started. Took me a few days to change a bunch of stuff, including the valve stem seals. Smokehouse is a distant memory now.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.