You can also the mechanic's stethiscope (i.e. a length of heater hose) to isolate noise.

With the car running, place one end next to your ear, and other against the suspect point.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles