However, above that threshold, the phase of the output shifts 180 degrees; that is, the response is the opposite of the input (input down, response up), so they partially cancel each other out. This is why a laundry machine jumps as it spins up, but becomes more stable the faster it spins. I'd bet that the auto engineers designed the engine

Hey I had the similar issues with my 750li. First of all let me tell you it's going to be a domino effect. First the shaking, if you haven't got the eggy smell from it yet you will "will be caused by coughs cat" shaking comes from the engine as 2009 -2012 BMW has really screwed the pooch on those engines.
2. When the car is started warm, it has a rough idle (knocking, tapping, sometimes roaring sounds). Previously I stated it had to sit for 20 minutes, but I found this is not the case. It happens immediately. Other factors: - A series of short trips seems to exacerbate the issue. The reason your Audi A4 shakes at idle but smooths out when accelerating is that the engine is spinning faster, which smooths out any misfires. If a motor mount is causing the problem, once you put the car into gear, the torque from the engine will hold it against the frame. It can be very jarring when your Audi A4 shakes when idle.
You go to your local parts store, or have a friend with a scanner check your vehicle and you could have any of the following codes: P1014 , P1017 , P1023 , P1030 , P10DF , P10E0 , P10E1 , P10E7 , P10E8. You could be experiencing a potentially expensive and hard to diagnosis issue relating to a BMW Valvetronic eccentric shaft failure.
4 posts · Joined 2018. #1 · Dec 30, 2019. Have 2 2015 F10s, one about 50k one about 110k. Lately, both are showing small vibration at idle that can be felt in the seat especially when cold. Much less so when engine is warmer. We have had these cars about 3 years and this has just appeared in the mast 3-6 months. Reving to about 1k it goes away.
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bmw 3 series shakes when idle