Engine Noise

thebmw · 09-16-2024, 04:42 PM

I was looking to buy another car but heard engine noise. Any thoughts?

GuidoK · 09-16-2024, 05:15 PM

That could very well be a blown rod bearing, as the tapping/rattling gets worse when revs rise.
But it could also be something like broken vibration damper (on the belt drive side). If the rubber damping inside that tears, it can also produce that rattling noise at certain rpm's
Anyway, don't drive with it and let a competent mechanic listen at it with an engine stethoscope. Should be easy to diagnose.
But I fear rodknock....

bvrider1 · 09-17-2024, 03:47 AM

Why did you take the video down? It for sure sounds like rod knock

thebmw · 09-17-2024, 04:08 AM

Quote:

Originally Posted by GuidoK

That could very well be a blown rod bearing, as the tapping/rattling gets worse when revs rise.
But it could also be something like broken vibration damper (on the belt drive side). If the rubber damping inside that tears, it can also produce that rattling noise at certain rpm's
Anyway, don't drive with it and let a competent mechanic listen at it with an engine stethoscope. Should be easy to diagnose.
But I fear rodknock....

Quote:

Originally Posted by bvrider1

Why did you take the video down? It for sure sounds like rod knock

Thank you for your feedback. Very appreciated!

09-16-2024, 04:42 PM	#1
thebmw Post Advisor 1815 Rep 1,771 Posts Drives: More Manuals than Automatics Join Date: Feb 2010 Location: Illinois iTrader: (10)	Engine Noise I was looking to buy another car but heard engine noise. Any thoughts? Last edited by thebmw; 09-17-2024 at 03:43 AM..
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09-16-2024, 05:15 PM	#2
GuidoK #buildnotbought 12488 Rep 5,247 Posts Drives: Z4 3.0i ESS TS2+ Join Date: Jul 2012 Location: Tinkering in the garage iTrader: (0)	That could very well be a blown rod bearing, as the tapping/rattling gets worse when revs rise. But it could also be something like broken vibration damper (on the belt drive side). If the rubber damping inside that tears, it can also produce that rattling noise at certain rpm's Anyway, don't drive with it and let a competent mechanic listen at it with an engine stethoscope. Should be easy to diagnose. But I fear rodknock.... __________________ Z4 3.0i \| ESS TS2+ supercharger \| Quaife ATB LSD \| Brembo/BMW performance BBK front/rear \| Schrick FI cams \| Schmiedmann headers+cats \| Powerflex/strongflex PU bushings \| Vibra-technics engine mounts \| H&R anti rollbars \| KW V3 coilovers/KW camber plates \| Sachs race engineering clutch \| tons of custom sh#t
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09-17-2024, 03:47 AM	#3
bvrider1 Captain 359 Rep 805 Posts Drives: e90 m3 + f80 zcp Join Date: May 2016 Location: 3rdCoast iTrader: (4)	Why did you take the video down? It for sure sounds like rod knock
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