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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 01-21-2013, 09:15 PM   #1
Moo221
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help me

i have a 2002 325xi every time i acceleration like if im waiting a a red light and i pull off the car make a flutter noise it does it all the time can somebody tell me what that is. plz
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Old 01-21-2013, 09:19 PM   #2
2000beamer
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It comes from the read of the car, right? I experience that same noise sometimes too but have not been able to determine what it is.
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Old 01-21-2013, 09:25 PM   #3
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Old 01-21-2013, 09:53 PM   #4
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Wheel bearing maybe
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Old 01-21-2013, 10:55 PM   #5
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lots of things make a flutter noise. you need to be more specific, give us some more details
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Old 01-22-2013, 04:50 AM   #6
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Clearly the tailight fluid needs flushing...
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Old 01-22-2013, 05:15 AM   #7
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I'm going with coils, on the theory that they fail more than plugs.

Get your codes read. You'll have some P03XX code (think that's misfire). You've lost a cylinder, I think. Only sound I've had that I'd call fluttering...sputtering.

Hard to notice the loss of power because you still have the rest of your engine going fine.

Autozone for free code reading...it will point to a cylinder. See that things 'look' okay...you could swap coil around and get codes read again and your code should change. If so, coil or coil boot (inspect that)...but probably coil.

That said, could be injector, bad plug, bad wire...but I'm going with the odds as I know them.

Or, your belt is ripped/ripping apart...should be visible...and you should have looked already.

You're welcome! LOL
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Old 01-22-2013, 05:16 AM   #8
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Quote:
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Clearly the tailight fluid needs flushing...
Trolling isn't helpful at all. The taillight flush is an Inspection 6 item...OP doesn't need that yet.
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Old 01-22-2013, 06:05 AM   #9
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Trolling isn't helpful at all. The taillight flush is an Inspection 6 item...OP doesn't need that yet.
dmax you are right. Totally forgot it wasnt till inspection 6. Though if it were Mango he would say do it now anyway...
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Old 01-22-2013, 06:11 AM   #10
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dmax you are right. Totally forgot it wasnt till inspection 6. Though if it were Mango he would say do it now anyway...
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Old 01-27-2013, 12:24 PM   #11
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@ dmax the car do not misfire i changed the serpentine and ac belt and i put in new coils i dont understand it when i start the car in the morning and drive it dosent do it but as the car warn up it starts to do it feels like it happening from the tear i cant really tell
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Old 01-27-2013, 04:18 PM   #12
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Flutter noise only when warm? Hmmm? Maybe a ripped intake boot...and you're mistaking where the sound is? Stuck exhaust flap?

I hope you didn't replace all coils without checking them first...fyi...my guess was maybe one coil is bad...you can replace just one at a time...guess someone suggested otherwise or you wanted to be safe. Next time, ask about stuff like this...hate to see money flushed away by anyone.
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Old 01-31-2013, 04:03 PM   #13
Moo221
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@dmax it maybe a stuck exhuast flap because it feels like its going threw the exhuast like its not gettin enough air
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Old 01-31-2013, 05:41 PM   #14
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Moo...see if your car has an exhaust flap...start with good flashlight up the tailpipe...(guys in California love it when I talk like that)...some models have it.

You also could explain flutter better, maybe, or videotape it and post it up here. Use a hose as stethoscope and see if you can hear the sound while someone is revving it for you...just watch out for moving things like belts and pulleys!

Also, fyi, here it's best to just address everyone. If you 'call' me to help...others might not thinking you think they're idiots. Truth is, they all are...it's really upsetting to me, but some pretend really well, and we should try to amuse them! Anyway, just a tip for the future here.

Also, details help a lot. If you want your car diagnosed over the Internet, more is better...and also, don't ever replace anything based on one person's word, and before you have work done, you can write here and get an opinion. You'd get codes for specific misfires...a flutter does sound like a cylinder has gone bad...but maybe you do have an air leak, and you should fine it. Lower intake boot is most common, but we have many vac lines...see jfoj's sig for that. You might be getting too much air.

Check your air filter anyway, since you seem to think it's air related...and look to see if you have some rusted flap in the exhaust...don't know where they are, but I know you can see them and get to them, so they can't be far if you have them.
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