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      09-18-2020, 07:13 AM   #1
SevM
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X4m comp Shaking (help)

Hi y'all,

I need your help. Is it normal for my x4m comp with 700 miles to be shaking while in park. Im
Sitting in the car and in park in my driveway and the car is shaking while the car is on just warming up.... but it constantly happens specifically on a cold start. I haven't really tested it mid-day because I haven't had to wait for the car to warm... just sat and drove. Anybody know why this could happen?
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      09-18-2020, 07:25 AM   #2
AlexFL
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Quote:
Originally Posted by SevM View Post
Hi y'all,

I need your help. Is it normal for my x4m comp with 700 miles to be shaking while in park. Im
Sitting in the car and in park in my driveway and the car is shaking while the car is on just warming up.... but it constantly happens specifically on a cold start. I haven't really tested it mid-day because I haven't had to wait for the car to warm... just sat and drove. Anybody know why this could happen?
yes, normal during cold start.
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      09-18-2020, 07:41 AM   #3
heavyD^2
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I don't have any shaking on startup.
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      09-18-2020, 08:55 AM   #4
2kaccordocoupe
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Quote:
Originally Posted by heavyD^2 View Post
I don't have any shaking on startup.
Same.

...and we live in Canada where a cold start is a cold start.
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      09-18-2020, 09:29 AM   #5
AlexFL
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Quote:
Originally Posted by SevM View Post
Hi y'all,

I need your help. Is it normal for my x4m comp with 700 miles to be shaking while in park. Im
Sitting in the car and in park in my driveway and the car is shaking while the car is on just warming up.... but it constantly happens specifically on a cold start. I haven't really tested it mid-day because I haven't had to wait for the car to warm... just sat and drove. Anybody know why this could happen?
how long is the shaking during cold start? could be faulty spark plugs.
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      09-18-2020, 09:59 AM   #6
ga9213
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Some are more senstive than others but there will always be a little bit of a stumble on a cold start with a direct injection vehicle.

Nature of the beast as the combustion is simply not efficient cold when spraying directly into the cylinder. You will have incomplete burn until warmed up. Not really a misfire but it will have some very slight stumbles. Many won't notice it.

I've had 10 direct injections vehicles now...every single one did it...except one which had port and direct injection.
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      09-18-2020, 10:13 AM   #7
BMWZ4
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Quote:
Originally Posted by ga9213 View Post
Some are more sensitive than others but there will always be a little bit of a stumble on a cold start with a direct injection vehicle.

Nature of the beast as the combustion is simply not efficient cold when spraying directly into the cylinder. You will have incomplete burn until warmed up. Not really a misfire but it will have some very slight stumbles. Many won't notice it.

I've had 10 direct injections vehicles now...every single one did it...except one which had port and direct injection.
Agreed. I've had this now & then with other bmw's, but not really that noticeable and settles down within a minute or two. That said, I haven't experienced it on my '20 x3mc or at least, haven't noticed it.
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      09-18-2020, 11:25 AM   #8
James Cole
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I have shaking at stoplights sometimes, and had this as well with the F80.
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