The 240D doesn't have a rack dampener bolt.

It sounds like something is still fishy with your vacuum system. Maybe something is routed incorrectly and supplying partial vacuum to the shutoff device when it shouldn't be.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References