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BMW 3-Series (E90 E92) Forum
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metallic sound
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10-12-2011, 09:13 PM | #1 |
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metallic sound
On cold starts I get a loud metallic raspy sound. Goes away during any revving or once the motor heats up...any ideas? Sounds like something rattling in the piping?
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10-12-2011, 09:15 PM | #2 |
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Wastegate rattle.
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10-12-2011, 09:23 PM | #6 |
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^that could be it...heard some people had these problems. It sounds like it's coming from a little past mid section of car. Hard to tell exactly where it's coming from.
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10-12-2011, 09:24 PM | #7 |
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Woodga,,i suspect its exhaust related... clamps, v/band clamps..try to slide under the car when u first start it up and have a listen which direction its coming from.
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10-12-2011, 09:30 PM | #9 |
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10-12-2011, 09:31 PM | #10 | |
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I had a clearance issue with my AE exhaust and the supporting bracket that sits underneath it. It would occasionally vibrate on cold starts. I would put the car up, let it sit overnight and crank it in the morning. You'll sort it out really quickly. ..lol
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10-12-2011, 09:34 PM | #11 |
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10-12-2011, 09:38 PM | #13 | |
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I will just add that I have gone to a couple of car meets..w guys running RLs and complaining of some noise w them..like Meth said hopefully u can sort it out. |
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10-12-2011, 10:01 PM | #15 |
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//M3THOD, I have to disregard anything you say now that I see your an Alabama fan ha ha JK. The tide kicked our a$$, and LSU...not looking good for auburn either seeing we're on our 3rd string qb...anyways, back to garage talk. I pull for all the SEC teams when we're not playing them. I went to UF...not just a fanboy. Thanks again for all the help...I'll do a follow up soon.
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10-12-2011, 10:19 PM | #16 | |
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GL sorting it out.
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10-13-2011, 12:13 AM | #17 |
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This is normal ,it's the secondary pump activating for cold starts and warming up the the cats up .The sound is more pronounced due to the catless downpipes,it normal don't worry car is fine!
Last edited by thebigragu99; 10-13-2011 at 12:41 AM.. |
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10-13-2011, 11:57 AM | #18 |
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Here's another option to check out. Visually inspect the bolt and the W shaped clamp that holds the exhaust in place. It's located just after the downpipes on the passanger side of the car. My bolt loosened up over time and was rattling very bad (metallic sound) on cold starts.
If you had wastegate issues, you would hear it on accel and deccel .... not just idle.
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