02-13-2020, 04:50 AM | #1 |
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Humming noise under slight acceleration
Dear,
My BMW F30 N20 with 40k mil has problem, it has humming noise come from font of the car under slight acceleration, rev from 1100-1450. if rev over 1500 noise gone, or left off throttle, or hard push throttle for trans downshift and rev will up over 1500 -> noise gone. It happend in comfort and eco mode, sport mode rev allway over 1800rpm so no noise. I do some but no help: - All coil and spark plug - Presure converter and vaccum pump - Trans fuil and fillter. - Engine oil and fillter. - Check CP but no crank, no leak. Air fillter and intake cleaner with no leak. Can any one give me advise or has problem like that know how to fix. Sorry for my english. Thanks. |
02-13-2020, 08:23 PM | #2 |
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I believe it is the "engine lugging", which happens when the car shifts to a higher gear but with low RPM. The engine is producing energy which cannot be transmitted to the wheels so the energy will be converted to heat and vibration, hence the "humming" you are hearing and feeling on the steering wheel. It is bad for the engine for sure.
It is possible than on D mode your car shifts to 8th gear and stays there with low RPM (1300 ish ) for good fuel economy, but causing the engine lugging. I personally also have this issue, and the lugging is worse when going uphil with light throttle, the car simply doesn't want to downshift. Very annoying. Do you also have a engine tune? If so then it makes it worse because a tune would increase the low-end torque, making the TCU even lazier to downshift. |
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02-13-2020, 09:38 PM | #3 | |
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No I don't have engine tune. So what is solution for it? I don't shiftpad on steering so if want down shift is very complicate. If go to sport mode is not comfort when I allway go on street not highway. |
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02-15-2020, 08:48 PM | #5 |
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Or try driving in sports throttle. Keeps the gears lower.
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02-17-2020, 02:09 AM | #6 |
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10-14-2020, 05:14 PM | #7 | |
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07-02-2021, 08:22 PM | #8 |
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i’ve got this problem too. When cruising in city(6th gear) or highway(8th gear) under 1500rpm the drone come, it’s really annoying. At first I though maybe xhp will solve the problem ,but after dig some post it’s seems to be worse after tuning?
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10-10-2021, 04:20 PM | #9 |
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I have the exact same problem with my f30, only happens when cruising at 25-35mph, the engine is at 1100 rpm and refuses to downshift until I accelerate harder. Any solutions?
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