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      10-17-2019, 12:39 PM   #1
nofomo
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Metallic Grinding/Rattling Noise Under Throttle

Over the last few weeks, I noticed that on cold start, once I drive off, increasing RPMs makes a gradual metallic noise in the undercarriage/rear area of my 135is.

I originally thought it was just a rock chip, but that doesn't seem to be the case.

Has anyone encountered this noise before? It tends to go away/not be as prominent after driving for a few minutes. No noise at idle or revving the engine in neutral.

I'm guessing something is loose and rattling?
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      10-17-2019, 04:54 PM   #2
lemansblau135is
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Metalic grinding sounds are NEVER a good sound
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      10-31-2019, 11:05 AM   #3
Mr Gasser
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turbo rattle?
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Metallic Black on Black 2009 135i, new waterpump, OFHGs, and VC gasket...RB turbo PCV valve (ooo), NGK performance plugs...V3Cobb access port stage 2+FMIC, Injen intake, Mishimoto clone FMIC, ARM charge pipe, ARM downpipes, Whiteline subframe bushings
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