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09-14-2010, 09:11 PM | #1 |
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fluttering sound
at about half throttle in first and second, there is a mechanical fluttering(best way I can think to explain it). Anyone know if this is a problem or is it normal?
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09-15-2010, 03:18 PM | #2 |
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Air Filter? There is a noise like you say sometimes from the air filter rattling in the air box. Not uncommon. Then it could also be many things.
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09-16-2010, 12:46 AM | #3 |
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V8 flutter?
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09-16-2010, 04:00 AM | #4 |
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With 10 individual throttle bodies, one or more may be rattling a bit as the air enters. It's probably doing it in all gears, but you can hear it better in the lower gears when the tires aren't drowning out the rattle sound. As long as there is no surging, I wouldn't worry about it. If it continues to bug you (it would bug me but I'm OCD...he he) see if the service people can hear it.
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09-16-2010, 04:09 AM | #5 |
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I thought their were 8 ITB's?
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09-16-2010, 10:20 AM | #6 | |
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10-07-2010, 09:24 PM | #7 |
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I have been analyzing the sound and thought I'd be a little more specific. It comes in at about 2100-2400 RPM in all gears(I've at least heard it in the first 4) and it's much louder when the engine is cold. It kind of sounds like a moped engine lives in my car and gives a little rev during those 300 rpms.
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10-07-2010, 10:34 PM | #8 |
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10-08-2010, 01:17 AM | #9 |
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i had a flutter too. it happened after i took my car in for service at bmw. turns out they removed the intake manifold, and when they put it back on, they didn't seat it properly on top of the throttle bodies. there were at least 2 throttle bodies completely exposed to unfiltered air! this and several other incidents at bmw is the reason i have no confidence in their techs. it's not that they're not able to do good work. oh yes they can. but it's all about money. the more cars they work on per day, the more money they make. so they don't give a rip about the quality of work they do. sad but true.
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10-08-2010, 07:40 AM | #10 | |
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10-08-2010, 07:59 AM | #11 | |
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But anyway, why would they remove the airbox over the throttle bodies for a normal service? Just curious, seems like a lot of work if nothing is wrong under there. |
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10-08-2010, 08:26 AM | #12 | |
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10-08-2010, 09:14 AM | #13 |
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10-09-2010, 02:24 AM | #14 | |
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the engine cover was so high off of the throttle bodies, it was touching the sway bar, and causing this awful vibrating noise inside the cabin. it took me a while to figure out what the problem was (fluttering upon acceleration and buzzing from the dash). i'm grateful that i'm somewhat mechanical, was able to figure it out, and put everything back together the way it was supposed to be.
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10-09-2010, 12:28 PM | #15 | |
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Finally, I could bet cash money the rubber gaskets were permanently damaged when tech just pushed down on the cover when it obviously 'bit' the gaskets inwards, preventing the cover to sit properly. If I were you, I'd remove the cover and inspect them. Fit is super tight, and you have to be patient AND CAREFUL until all 8 'trumpets' are seated properly. And use a socket, not a screwdriver for the clamps. Take care. Last edited by JCtx; 10-09-2010 at 12:37 PM.. |
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10-09-2010, 10:54 PM | #16 |
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no they didn't replace the idle valve, they replaced the a/c evaporator. i too completely removed the engine cover. the gaskets looked okay, but i'm no expert, so they very well may have been damaged. i would say i only put on maybe 300 miles before i figured out the engine cover wasn't seated properly.
and i don't know if my engine cover is defective/crooked or what, but i had a hard time seating it properly too. it just would not sit straight. all 8 "trumpets" would not fit into the throttle bodies tightly. it's like it would rock to the front and the rear, but would not go down flat on all 8 throttle bodies. so i just pushed it down straight as far as I could and tightened the screws. thanks for the tips though.
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10-09-2010, 11:02 PM | #17 |
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That's some funny shit
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10-10-2010, 12:26 AM | #18 | |
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12-27-2012, 02:31 PM | #19 |
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Sorry to resurrect an old thread :-). I test drove a used 2009 e90 dct m3 yesterday...first m3 I've driven.. Noticed a very odd sound, only when accelerating under load. Sounded like crackling/fluttering, almost like air trapped under paper. Seemed like it was more from the front left of the vehicle. I wouldn't say it was a "rattle" as some have described, but more a crackle, or sound like tearing something. Very weird.
I will obviously bring it up when I get the PPI, but just wanted your input as to whether this is the same kind of noise so many are hearing during acceleration. I parked the car and revved the engine, and the sound wasn't there. Only during acceleration was it there. I should've paid attention to e rev range when it happened, but unfortunately I didn't. Car seemed great other an that, and other than the driver side mirror not lining up properly. Thx for any help! Hopefully will be an m3 owner by the end of January :-) |
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08-26-2016, 02:20 AM | #20 | |
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Hi mate. Hope you've owned the m3 and many more thereafter. I have heard this sound in my 320d as well it's like a fluttering sound. How did you get this fixed. Kindly educate please. |
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08-26-2016, 02:23 AM | #21 | |
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Hi mate. Sorry to resurrect this old thread. I have a moped engine living in my car and which makes a fluttering sound at 1500 to 2500 rpm. Curious to know what was the issue and how did you manage to remove the moped out of your car. |
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