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The 1990 745 GL that we just bought buzzes when it is idling in gear. When shifted to Neutral or Park, it smooths out. Is this possibly due to a slightly low idle? Our 1991 sometimes idles low, but does not buzz.
Any ideas or suggestions?
I probably should do a compression test or something, but at the moment, it drives and runs very well, and I am worn out from two weeks of urgent/emergency problems rearing their heads. Besides, when the 1991 blew a head gasket, it was nothing like an even buzz, but a clearly uneven, shaking and thrashing vibration.
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