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E46 330d boost noise
22-06-2017, 07:47 PM
Post: #1
E46 330d boost noise
Hey guys, went and test drove a 330d earlier. It's the 2002 135kW model. Car didn't really pull that well, boost only sort of came in around 3k+ rpm. The biggest concern though is the noise it was making on boost. Attached is a video I made:





What could this be? Sounds awful. From memory, the 330d boosts much from below 2k rpm and pulls harder as the revs climb. I couldn't actually hear the turbo boosting. The power also does not seem smooth, there are like steps in it while the revs approach the red line. I didn't notice any smoke from the car though and apparently the turbo was replaced by BMW around 4 years ago.

Please help guys, I need to decide whether to go with the car or walk away. Thanks.

2004 330d M Individual - Malachite Green
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23-06-2017, 07:26 AM
Post: #2
RE: E46 330d boost noise
Anybody? None of the experts heard this before or know what it is / could be?

2004 330d M Individual - Malachite Green
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23-06-2017, 09:16 AM
Post: #3
RE: E46 330d boost noise
Boost leak.
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Luigi_S
23-06-2017, 09:19 AM (This post was last modified: 23-06-2017 09:21 AM by Luigi_S.)
Post: #4
RE: E46 330d boost noise
(23-06-2017 09:16 AM)Gizmo@GARAGE46 Wrote:  Boost leak.

Thank you. Any idea where that could be?

PS: Where are you based?

2004 330d M Individual - Malachite Green
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24-06-2017, 08:36 AM
Post: #5
RE: E46 330d boost noise
Common boost leak spot is where the charge pipe meets the intercooler.
Im based in Brackenhurst Alberton
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Luigi_S
18-08-2017, 09:42 AM
Post: #6
RE: E46 330d boost noise
Definitely a boost leak. We had one of these years back. Yo would FEEL the power of this car. I would pass if you are looking at buying, unless you could get it for a steal.
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