rattle from about 1500-2500 rpm

slowest90@kc · 10-24-2021, 03:19 PM

Ive got a 2008 335i FBO, 150k miles, upgraded turbos to pure stage 2 a couple months back. Ive had this rattle since I had my stock turbos in. I used to only be able to hear it when I was hardly on the gas from about 1500-2500 rpm. once I got into boost it would go away or I just couldn't hear it anymore. last couple days its been getting worse and worse. I now also hear it when im going anywhere from 20-30 mph low rpms and I let off the gas, I hear the turbo whistle and the rattle at the same time. rattle stops at the same time the turbo sound does as well. I don't think it is wastage rattle because Ive had this same rattle before changing turbos. Anyone had this same issue?

Jooebimmer · 02-25-2022, 09:10 AM

Hello,

I have a 2010 328i and have the same problem, I did not make any modifications to the engine.
I did replace a rear axle and problem remains.
Some posts have suggested replacing sparkplugs, which I did and no improvement. I also drained the transmission fluid with Dr Tranny and no change either.

10-24-2021, 03:19 PM	#1
slowest90@kc Registered 2 Rep 4 Posts Drives: 2008 BMW 335i Join Date: Oct 2021 Location: Kansas City iTrader: (0)	rattle from about 1500-2500 rpm Ive got a 2008 335i FBO, 150k miles, upgraded turbos to pure stage 2 a couple months back. Ive had this rattle since I had my stock turbos in. I used to only be able to hear it when I was hardly on the gas from about 1500-2500 rpm. once I got into boost it would go away or I just couldn't hear it anymore. last couple days its been getting worse and worse. I now also hear it when im going anywhere from 20-30 mph low rpms and I let off the gas, I hear the turbo whistle and the rattle at the same time. rattle stops at the same time the turbo sound does as well. I don't think it is wastage rattle because Ive had this same rattle before changing turbos. Anyone had this same issue?
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02-25-2022, 09:10 AM	#2
Jooebimmer Registered 0 Rep 4 Posts Drives: 2006 325i and 2010 328i Join Date: Feb 2022 Location: Houston iTrader: (0)	Hello, I have a 2010 328i and have the same problem, I did not make any modifications to the engine. I did replace a rear axle and problem remains. Some posts have suggested replacing sparkplugs, which I did and no improvement. I also drained the transmission fluid with Dr Tranny and no change either.
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