My car is in winter storage so I cant speak to the problem currently, but this only happens to my car on full- bore acceleration. There might be a clue in there somewhere.
92 500e, 85k, silver/gray,all stock.
96 Club Wagon,Hypertech chipped( College Hauler)
97 320 SL 50k
1980 BMW e21 323 Baur conv.
1990 300GE 99k