11-24-2017, 02:37 PM | #1 |
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Loud metallic exhaust rattle at cold start
Good morning yall
I thought I would ask the question here and see if there is an easy solution for my X3. I have noticed at cold start, I have a VERY loud metallic rattle out of the exhaust, right at the exhaust, for about 10 seconds or so. After that it goes away until the next cold start. I am guessing there is some cold start flapper or valve maybe on the exhaust? Maybe? Is this common and any suggestions? Thanks!
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01-16-2018, 10:58 PM | #2 |
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No suggestions or hope on this one?
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01-18-2018, 08:09 AM | #3 |
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the exhaust is probably loose, tighten the bolts
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01-18-2018, 08:28 PM | #4 |
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Is this common? If the car is kept outside under extreme weather conditions daily, then yes. It is a BMW after all. There is a baffle within the exhaust (it looks like a flap). On idle, the baffle is closed and when you press the accelerator, the baffle opens. This mechanism is either jammed due to crud or needs replacement. http://mixedwiki.com/bmw-x3-muffler-rattle-fix/
Also could be a loose vacuum line or bolts. |
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01-18-2018, 08:38 PM | #5 | |
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Thank you!
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01-24-2018, 06:23 AM | #6 | |
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02-25-2018, 09:01 PM | #8 |
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