11-28-2021, 04:00 AM | #1 |
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Knocking noise at low speed
Hi guys, I just bought 2016 m4 a week ago and heard it from the first day of purchase
It does that noise when I start to accelerate from a stop or from a cruise or when I change from R to D and accelerate a little It happens only on low speed Car has on 17k miles I have the same noise as this guy on video Please help to figure out what the problem is Thank you |
11-28-2021, 09:35 AM | #3 | |
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Drives: 2015 f80 M3
Join Date: Oct 2016
Location: East Bay Area, CA
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We could use some more info. Clearly the car is a DCT? Any mods to the car? Where approx does the sound come from? Right next to you? At the back of the car? In the front of the car? Can you conntact the seller for more info? FWIW, these cars make some crazy noises stock. Lots of driveline noise and the DCT can be clunky when driven softly (low speeds, reverse to forward). I find my DCT get confused ebry now and again when making a Cali stop, or getting the green light right as I am about to stop. To me, from the little info and the vid, it sounds like the tranny engaging or the diff engaging. I have a Turner plate and poly bushings in my F80 and I can here the gears engage all the time as I come off anf on the power. Especially when driving easy around town. Mine is exageratted because of the plate, but keep in mind that noise is still there in other cars, its just being muted by the stock tofu soft bushings. Anyway, I do hope it is just driveline noise and not something else. good luck, josh |
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11-28-2021, 11:35 AM | #4 | ||
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https://youtube.com/shorts/XsUky__qD-U?feature=share This is what it does when stopping The car on dct, stock |
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11-28-2021, 01:42 PM | #6 |
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More of a clunk (bushing) than a knock (engine). Check diff and trans bushings good…?
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'18 F80 Base 6MT | '19 F82 Exec DCT | '18 F82 Comp Exec DCT | '23 G80cx
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11-28-2021, 02:51 PM | #7 | |
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I turned off the car and turned on, and it's disappeared and never came back |
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11-30-2021, 08:17 AM | #8 |
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Maybe yours prefers "eggs n bacon" mine is Vegan and is very picky about it's donuts
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