2004 BMW 330Ci engine noise

mongoose1951 · 05-10-2024, 05:35 AM

Hi,
On my 2004 330Ci with 220,000 miles.
When cold the engine makes a loud whine noise especially when accelerating, goes away when at operating temperature. Also there is a lot of mechanical noise inside the engine, goes away after engine is warm.
Big problem, or little problem?
Thanks

tjbuggy2b · 05-10-2024, 08:49 AM

Depends on the noise but I'm guessing it's not good, either way.

CTSean · 05-10-2024, 10:26 AM

Check the secondary air pump which should be easy to tell if the noise at start up and while cold is coming from it.

"Alot of mechanical noise" is not enough to really say anything. try and determine the source of the noise or maybe record a video and someone may be able to identify the noise.

05-10-2024, 05:35 AM	#1
mongoose1951 Registered 4 Rep 1 Posts Drives: BMW 330Ci BMW 435i Join Date: May 2024 Location: Germany iTrader: (0)	2004 BMW 330Ci engine noise Hi, On my 2004 330Ci with 220,000 miles. When cold the engine makes a loud whine noise especially when accelerating, goes away when at operating temperature. Also there is a lot of mechanical noise inside the engine, goes away after engine is warm. Big problem, or little problem? Thanks
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05-10-2024, 08:49 AM	#2
tjbuggy2b Lieutenant 234 Rep 512 Posts Drives: 2018 540i xDrive M Sport Join Date: Nov 2010 Location: Columbus, OH iTrader: (0)	Depends on the noise but I'm guessing it's not good, either way.
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05-10-2024, 10:26 AM	#3
CTSean Lieutenant 344 Rep 405 Posts Drives: LCI BSM MT M2 Join Date: Dec 2018 Location: CT iTrader: (1)	Check the secondary air pump which should be easy to tell if the noise at start up and while cold is coming from it. "Alot of mechanical noise" is not enough to really say anything. try and determine the source of the noise or maybe record a video and someone may be able to identify the noise.
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