Member
My 2000 2.8 L Z3 with automatic transmission has developed a high pitch humming noise when running at a steady constant speed (any speed). Noise disappears upon acceleration and deceleration.
Can anyone help.
Member
Differential??? In buying older cars, I usually just change the diff fluid to Redline or Royal Purple. It quiets them down, and it's good preventative maintenance.
Ralph
Does the noise change when turning or lane changing? Is the noise present at idle? Does the noise change depending on what speed you are going? Does it change depending on what RPM your are at?
Is Enabled
BMW Tech Expert
Is the car new to you?
The old GM transmission fitted to the 99-2000 automatics loves to resonate in the cabin and creates a whirring sound especially when not accelerating or decelerating; because of the way it was mounted. BMW had released documents a long time ago addressing this noise, and some alternate transmission mounts were used.
It could be that.. or something else.
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
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- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
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