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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Weird startup noise. Any help appreciated!



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      09-27-2016, 03:36 AM   #1
Recon3D
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Weird startup noise. Any help appreciated!

Hi guys, I've got a little bit of a problem with my 335. Long story short, I bought the car a few months ago with 98k miles because it had a major service recently done and overall I liked the condition of it, however, when I bought it I didn't notice the weird startup noise as much or maybe it was just quieter. I'm really happy with the car so far, the car runs fine after the startup, however, the noise is really annoying and I would like to get it fixed if possible. If I were to describe the noise, I would say it almost sounds like the car is about to choke for a brief second. I tried looking around to see if I could find a thread similar to this one, but I think I'm without luck. Let me know what you guys think. Thanks!

Here is the youtube link:
https://www.youtube.com/watch?v=XLei5qQY_yU

Edit: You can hear the noise well between 0:17 - 0:20 and 0:36 - 0:38
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      09-27-2016, 10:47 AM   #2
Gohan335i7
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Plugs, coils, or injectors. Maybe A leak somewhere.
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      09-27-2016, 11:34 AM   #3
r_3
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belt tensioner.
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      09-27-2016, 01:38 PM   #4
Recon3D
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Quote:
Originally Posted by Gohan335i7 View Post
Plugs, coils, or injectors. Maybe A leak somewhere.
I'm gonna check those within the next few days, although if it were the sparkplugs wouldn't it also drive poorly? Car runs normal after the initial startup, it idles normal, doesn't stall and no misfires.
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