When I go in reverse (i.e. backing out of the garage), I hear a sound like tat-tat-tat that in synchronous with the speed in which I am going in reverse. I always hear it when the engine is cold. It is not always audible when the car has been driven a while. Any speculations on what the issue could be? It is a '92 124 body.

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Mark Herzig
1992 500E (82,000 miles)
1987 300SDL (105,000)