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Exhaust Rattling on startup?...
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09-16-2009, 04:27 AM | #1 |
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Exhaust Rattling on startup?...
it might be normal but i just wanted another opinion every time i start up my car it kinda has this rattling sound but at the same time it sounds like a chain or something... anyone know what it could be or if it's normal?
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09-16-2009, 04:36 AM | #2 |
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got exactly the same , only cold motor at startup
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09-16-2009, 06:32 AM | #4 |
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is it just when the car is cold? if not it might be some problems with the catalytic converters...
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09-16-2009, 06:43 AM | #5 |
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Most dual exhaust systems on bmw's have a vacuum tube that opens and closes one side of the exhaust until the o2 sensors heat up. My e46 330's came off for more than a year. After putting it back on there is some noise while it opens or closes in the morning.
You may want to get a light and look under the car.
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09-16-2009, 08:28 AM | #6 |
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Wastegate rattle?
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09-16-2009, 08:36 AM | #7 |
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I think I have the same noise. I also had wastegate rattle and got a new set of turbos but this noise didn't go away. I will try to record it so we can compare but mine happens right before the exhaust flap closes and it doesn't matter if the engine is cold or not.
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09-16-2009, 10:28 AM | #10 |
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I had an issue like this at one point, i got under the car and one of the brackets that you screw in which supports the exhaust had come loose and was dangling parallel to them inbetween. Every other time I started the car or was at idle it sounded like a chain in a tin can.
long story short, that bolt was so rusted (thanks VT salt) that when i tried to loosen it it broke right in half. Last edited by jpsimon; 09-16-2009 at 01:57 PM.. |
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09-16-2009, 01:49 PM | #11 |
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The flap in the rear rattles on every BMW I have had. It occures a second or two after a cold start.
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09-16-2009, 02:46 PM | #13 |
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Yep.
It's the wastegates closing during start up. It's normal.
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09-16-2009, 02:57 PM | #14 |
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09-16-2009, 03:16 PM | #15 |
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thanks for the replies guys, yeah it seems to just do it on a cold start and the only mods i got is the dual cone ex. probably gonna get the quad ex. later on, but yeah i guess it's normal n i never ask the dealership it always seems like they got something to say haha...
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09-16-2009, 04:17 PM | #16 |
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i had a problem with the bracket, they grinded it down a little for me cause it was hitting the metal head shield thats on top of the muffler
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