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Q:

Knocking sound when accelerate after installing new motor mounts. on 1999 Mercedes-Benz SL500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
motor mount and trans.mount fits right . knocking noise coming from underneath passenger side. especially if turning right. no more noise after cruise 25 mph.
(1) Answer
If the noise only started AFTER the mounts were replaced , maybe re-check ALL work as a start.