Interesting, once I changed the fuel, the knock was gone and hasn't returned. However, last night I did replace my support bracket because I know my driveshaft has been off balance and the rubber was deteriorated. The knocking occurred when I was stationary and there was no movement so I had ruled out the bearing even though I knew I needed to replace it. Finally got around to it last night, but I know it will need replacing again until I get the shaft balanced.

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1990 190E 3.0L