03-19-2017, 10:04 PM | #1 |
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M235i, 8AT, 32K miles. Bought it CPO with 28404 miles two months ago. Just had the 10K miles dealership scheduled service about 3 weeks ago (oil change, scope check, vehicle inspection report).
In sport mode, I've noticed a slight rattle and ticking sound from engine/transmission when accelerating lightly with paddles. Don't really hear it at highway speeds, more noticeable on quiet roads. Shows up just around 2-3K RPMs under light acceleration blips, especially around 30-40mph in 2-4th gear. Don't really hear it in auto mode since the car usually shifts itself before 3K. Did a ridealong with a BMW tech at a local dealership today and he said the light ticking sound is normal and is VANOS operation. Just wondering if anyone else has heard something similar. Here's a video - driving low speed between 1st and 3rd in paddle mode, accelerating slowly (few inches down on the pedal), doing no more than 3K RPM. It's that slight rattling/buzzing sound as the revs go up. Last edited by jcl89; 03-30-2017 at 12:47 AM.. |
03-20-2017, 12:02 AM | #2 |
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Rattle is a pretty generic term. Did the sound come from the front middle or back of the car? Could be the vanos (unlikely), heat shield, or muffler flap valve.
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03-20-2017, 01:58 AM | #3 |
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03-20-2017, 05:46 PM | #5 |
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03-21-2017, 02:50 PM | #6 |
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No inside the inside of the car. Your ears can be easily fooled when in the car sometimes a sound, that you would swear is coming from outside, is really something in the interior like a rattling glove box, interior panel, or dash piece.
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03-26-2017, 07:29 PM | #7 |
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Took an 87 mile trip today and was able to reproduce the vibration sound going uphill, downhill, and straight. Seems to come on around 3000rpms, especially around 30-40mph in 3rd gear. Most noticeable under light acceleration. Sounds like it's coming from the engine or transmission since I seem to be hearing it through the Active Sound.
Guess I'll call the service advisor tomorrow and see if they can take a look. |
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04-03-2017, 05:19 AM | #9 |
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04-17-2017, 10:26 PM | #10 |
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So I took it to the dealer I bought it from for a 2nd opinion and they told me it was also normal. They checked it against other M235s that they had, and also verified everything was tight on the car.
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06-24-2017, 07:35 AM | #11 |
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are your tires balanced? I get a shimmy/vib at about 50 mph, but I know that's due to my tires having a resonance at that speed. too minor to drop $100 to rebalance!
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06-24-2017, 07:21 PM | #12 |
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04-03-2021, 02:19 PM | #13 |
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Did you ever find the solution?
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