Hi, i have a 850i from 1992. There seems to be a problem with the engine, is is making a knocking noise coming from the left hand bank that is consistent with the revs i.e gets faster when the revs build.
I have just changed the oil and done an engine flush, and also added some hydralic lifter fluid which has made no differnece the knocking is still there.
Also there seems to be a little vibration from the engine when accelerating between 1500 and 2000 revs which is accompanyed by a quiet grinding kind of sound. (not how else to describe the sound :P)
Any help is greatly appricated. !