BMW Forums : BimmerForums banner

1 - 2 of 2 Posts

1,824 Posts
Discussion Starter #1
Hi guys, hoping some of your might be able to shed some light on this.

I've noticed over the last little while that if I start the car from stone cold in the morning and let it warm up (sat there idling for a few minute) it makes a sort of grumbling, pulsing noise. It gets quieter as it warms up and then goes away and only does it when stone cold.
I've not had a chance to investigate or take a video but are there any common causes for this?
My first guess is the alternator as it's due to be replaced soonish anyway; do the bearings make a grumbly/rattly/pulsing noise when they go?
1 - 2 of 2 Posts