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      01-21-2021, 12:21 AM   #1
deeldoo
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Shaking Car

My 2016 M4 is being super weird.

It is very cold here in toronto and the car pulses and vibrates while accelerating at partial or even WOT. Car pulls hard, no check engine light, but the vibration is super annoying. It seems to always be worse the colder the weather gets.

Other than that in cold weather, even sitting at a stop light putting my hand on the driver side door you can feel vibrations throughout.

Is this normal for anyone else's cars? I have to mention i do have cat-less downpipes. It seems to be weather is the biggest difference maker but even idling i can feel vibration on the door. I have only gotten it a handful of times to be completely smooth while idling.

Had spark plugs changed 5k kilometres ago, tires balanced, oil changed. Car pulls strong, no check engine.

Confused and ruins the driving experience, feels like all the boost coming through is going to bust the charge pipes in pieces when i accelerate hard, shaking pulsing everywhere.
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      01-21-2021, 05:26 AM   #2
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Whats the mileage on the dash?

Any aftermarket intakes?

I would hook up and OBD2 scantool and see if any codes pop up
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      01-21-2021, 10:21 AM   #3
deeldoo
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Quote:
Originally Posted by Gertsee View Post
Whats the mileage on the dash?

Any aftermarket intakes?

I would hook up and OBD2 scantool and see if any codes pop up
Only 53000 km, so like 30k miles or so.

No codes show, no intakes.

Took it out this morning, warmer weather less pulsing
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      01-21-2021, 02:23 PM   #4
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Engine mounts?
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      01-21-2021, 02:42 PM   #5
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Did you change anything on the car or had service done before this issue came up?
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      01-21-2021, 04:18 PM   #6
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Quote:
Originally Posted by BigKutta View Post
Engine mounts?
+1. That's what I was thinking too.
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      01-21-2021, 04:46 PM   #7
deeldoo
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I have had the car serviced yes but have not had engine mounts checked, i had a cbc installed recently.

This car has has the same issue for the whole time i have had it and i bought it used with 14k miles on the dash and had it PPI'd. Also it has gotten a tiny bit worse but not too quantifiable.

The cold really brings out the pulsing/shaking. It is not really rpm or speed dependent but at WOT you can definitely feel it more.

I will get those engine mounts checked potentially
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      01-21-2021, 05:20 PM   #8
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Quote:
Originally Posted by deeldoo View Post
I have had the car serviced yes but have not had engine mounts checked, i had a cbc installed recently.

This car has has the same issue for the whole time i have had it and i bought it used with 14k miles on the dash and had it PPI'd. Also it has gotten a tiny bit worse but not too quantifiable.

The cold really brings out the pulsing/shaking. It is not really rpm or speed dependent but at WOT you can definitely feel it more.

I will get those engine mounts checked potentially
Cold temps harden rubber and liquids. Since mounts are made of one or both, seems logical that you feel it more these days. This happened with my old Infiniti G37. Keep us posted and good luck.
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      01-21-2021, 05:23 PM   #9
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Does it go away when the car gets warm?
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      01-21-2021, 05:41 PM   #10
deeldoo
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Quote:
Originally Posted by RugbyBro View Post
Does it go away when the car gets warm?
No not related at all to the engine temps, if it's frigid outside the car shakes and pulses more especially as you really hammer on it.

In the summer you could hardly feel it/barely feel it.

Also my idle still you can feel vibrations in the side of the door
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      01-23-2021, 01:12 AM   #11
deeldoo
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Would vibration lessen if the car is in neutral vs in gear if it's my motor mounts.

This car has so many buzzy shakes and vibrations everywhere. I think this catless MPE might have something to do with it.
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      01-23-2021, 01:39 PM   #12
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Quote:
Originally Posted by deeldoo View Post
Would vibration lessen if the car is in neutral vs in gear if it's my motor mounts.

This car has so many buzzy shakes and vibrations everywhere. I think this catless MPE might have something to do with it.
Perhaps. I know in my F10, when the car is under load (acceleration) the vibration gets worse. Also bad in cold weather. A mechanic should be able to look at yours and tell you. I may have mine replaced soon.
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      01-23-2021, 02:28 PM   #13
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Quote:
Originally Posted by deeldoo View Post
Would vibration lessen if the car is in neutral vs in gear if it's my motor mounts.

This car has so many buzzy shakes and vibrations everywhere. I think this catless MPE might have something to do with it.
Yes. Just replaced motor mounts in my e46, but have replaced them on multiple bmws and the application should be the same for any car. When in gear (auto) it causes the vibration much more simply due to the additional load on the engine. Putting it in neutral reduced it by roughly half if not more.
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      01-23-2021, 02:52 PM   #14
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It could be flat spotted tires. Especially if it goes away in warmer weather. Have you checked for any snow buildup in the barrel of the rim?
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      01-23-2021, 03:52 PM   #15
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When was the last time it had a turnup? Might be time for a tuneup. Motor mounts are not really an issue on this car.
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      01-23-2021, 10:56 PM   #16
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Quote:
Originally Posted by Jbonly21 View Post
When was the last time it had a turnup? Might be time for a tuneup. Motor mounts are not really an issue on this car.
I mean i have done the bare basics, oil changes, spark plugs, coolant flushes, etc. Only about 5k kilometers ago.

I can feel the vibration in the steering wheel, side door, floorboard, everywhere. Annoying buzzy feel.

I was thinking recently maybe my catless downpipes are hitting against the subframe
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      01-30-2021, 01:40 PM   #17
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OP,
Do you notice any difference in the pulsing/vibrating if you're in Comfort, Sport or Sport+?
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      01-30-2021, 02:50 PM   #18
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Quote:
Originally Posted by _E90S65_ View Post
OP,
Do you notice any difference in the pulsing/vibrating if you're in Comfort, Sport or Sport+?
Ive has my mechanic look at this car, everything is perfect, motor mount, tranny mounts, all bushings, hoses, vaccuums, exhaust.

Nothing wrong, he took it for a 30 minute drive with me.

He has driven countless amounts of the F8X and said most exhibit some sort of vibration.

At this point he suggested i could chase this but the chase is going to end up with driveshaft removal, sent to balance machine, and we go from there.

I am really stumped.
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      01-30-2021, 05:21 PM   #19
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Is this your first season with that winter wheel and tire setup?

My GUESS is its vibrations from your winter tires being passed into the cabin via the awesomely stiff chassis

Edit: I had random noises in my f80 attributed to stuff in the front door pockets, so theres definitely vibration passed into the cabin. Ive never had plush interior cars so I never thought it was an issue.
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      01-30-2021, 07:06 PM   #20
deeldoo
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Quote:
Originally Posted by nicknaz View Post
Is this your first season with that winter wheel and tire setup?

My GUESS is it’s vibrations from your winter tires being passed into the cabin via the awesomely stiff chassis

Edit: I had random noises in my f80 attributed to stuff in the front door pockets, so there’s definitely vibration passed into the cabin. I’ve never had plush interior cars so I never thought it was an issue.
Second season, my summers did it too.

I shit you not i have spent over 1 grand on tire balancing for this and it's not the tires, my mechanic confirmed it.

He sees a ton of M cars, does rod bearing repairs, crankhub fixes,etc.

He doesn't know why the F chassis gets so much vibration but driving my car he pinned it as smack dab in the middle of the pack in terms of resonance.

This is my opinion, this car has far too much chassis vibration and feel (i.e. feel from the exhaust resonance, dct power shifts, diff clunk and operation) and far too little feel in the steering and connection to the road.

I think this awkward balance makes the car feel broken, anytime i run the car through super rough roads the vibrations in the chassis don't annoy me as the vibrations from the road feel drown it out and it feels like a proper sports car.

It almost feels like i am floating on a camry suspension and steering feel while being inside of a 2003 stripped out 260k miles e46 M3.

Like i feel the steering and suspension should match the rest of the stupidly rough chassis character. It boggles my mind how at times i can't feel what's underneath my feet or what i am steering with my hand but i can feel the damn dct smashing my head from the back and the diff clunking and operating.
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      01-30-2021, 08:10 PM   #21
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Are our motor mounts electronically controlled?

My Odyssey was and when the electronic mount went bad I felt a lot more shaking.

If the driveshaft was the issue, you wouldnt feel it at idle.
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      01-30-2021, 11:14 PM   #22
deeldoo
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Quote:
Originally Posted by BzsBimmer View Post
Are our motor mounts electronically controlled?

My Odyssey was and when the electronic mount went bad I felt a lot more shaking.

If the driveshaft was the issue, you wouldn’t feel it at idle.
Not too sure tbh i had my mounts looked at and they were in great shape.

My car has a buzzing at idle but the actual vibration on load feels a bit different so not sure what to attribute it to tbh.

At this point i will wait until summer comes along, it seems to become 80% better in warm weather.
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