02-16-2022, 03:37 PM | #1 |
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S55 idle smoothness?
When stopped in traffic, the idle on my '21 M2C seems to be a bit uneven/lopey, and very slightly shakes the car.
Car has only 3,800km and first noticed this a while ago with only a few hundred km. Stock tune, stock downpipes, stock exhaust, stock airboxes. ISTA+ doesn't show any misfire codes or any other engine-related codes. This is my first S55/N55 car so nothing else to compare it to. I also have a diesel N57 which makes more idle vibration, but at least that is perfectly even and consistent. Question: Is this normal or not? I'd like to get an idea of whether this is normal or not before starting to do things like replace the spark plugs, having read about some folks on here who had a dud plug from new. |
02-16-2022, 08:24 PM | #3 |
Second Lieutenant
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Could be cam alignment issues. Check out this guy who took a video of the engine idle sound before and after getting it fixed by BMW.
He was stock and very low miles. https://m.facebook.com/groups/s55tun...82835145949100 |
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02-16-2022, 09:32 PM | #4 | |
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Drives: 2019 F87 M2C, 2023 G87 M2
Join Date: Mar 2018
Location: North America
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02-16-2022, 09:45 PM | #5 |
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Drives: '21 M2 Comp, '19 Golf R
Join Date: Oct 2005
Location: Cochise County, AZ
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At 10k miles mine purrs like a kitten, always has.
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'21 M2 Comp
'19 Golf R |
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02-17-2022, 09:35 AM | #6 |
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Is it like the fuel to the motor is pulsing? like rpms ranging 200-300 difference? Mine does it when its warming up, definitely more noticeable with aftermarket exhaust. I asked the service guy about it and he had the tech guy look at it, everything is normal is what they said. About 44k on the car.
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02-18-2022, 08:36 PM | #7 |
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It does this when fully warmed up to operating temp.
No rpm change on the tacho and no noticeable sound change but that isn't saying much with a stock exhaust and windows up. So it's felt, not heard or seen. Can feel the engine rocking slightly in its mounts in a uneven way at idle. |
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