Knock/bang on startup


Senior Member
Aug 26, 2017
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Your Mercedes
E320 cdi sport 2007
I get a knocking noise (only knocks or bangs once) on startup from cold. The local garage had a look when they were replacing a ball joint for me and said they could find nothing mechanically that would explain it. I wonder if it could be the engine or gearbox mounts? Is there a way to check or any other thoughts on what could be causing it?

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