Terrible Sound from Engine Bay

adill1 · 08-30-2023, 09:33 AM

adill1 · 05-29-2024, 09:35 AM

bumping this thread up - any thoughts? Thank you!

minulache · 05-29-2024, 10:40 AM

I would go with belt tensioner, the 2 pulleys and belt before looking into the alternator. Had the same noise and it was from the belt tensioner

whyzee125 · 05-29-2024, 12:26 PM

My friend's N55 had a similar noise and it ended up being his fan. The next most likely IMO would be your power steering pump.

adill1 · 09-09-2024, 12:31 PM

whyzee125 thanks! Im leaning towards probably power steering pump as I recently flushed the fluid with CHF 11s, but the wheel still feels "heavy" and also there is some vibration in the steering wheel at low speeds around tight corners. Do you have any thoughts on how i could confirm a failing PS pump before DIY?

whyzee125 · 09-15-2024, 09:26 AM

Quote:

Originally Posted by adill1

whyzee125 thanks! Im leaning towards probably power steering pump as I recently flushed the fluid with CHF 11s, but the wheel still feels "heavy" and also there is some vibration in the steering wheel at low speeds around tight corners. Do you have any thoughts on how i could confirm a failing PS pump before DIY?

Unfortunately not—the only pumps I’ve ever replaced were due to noise but usually functioned normally as far as steering feel goes.

darkfires102 · 09-17-2024, 12:19 AM

Belt + tensioner and idler pulleys needed.

Replace that mickey mouse flange with an aluminum one while you're at it before it leaves you stranded.

08-30-2023, 09:33 AM	#1
adill1 New Member 9 Rep 27 Posts Drives: 2011 335i Xdrive 6MT Join Date: Jan 2017 Location: NJ iTrader: (0)	Terrible Sound from Engine Bay - New Alternator?
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05-29-2024, 09:35 AM	#2
adill1 New Member 9 Rep 27 Posts Drives: 2011 335i Xdrive 6MT Join Date: Jan 2017 Location: NJ iTrader: (0)	bumping this thread up - any thoughts? Thank you!
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05-29-2024, 10:40 AM	#3
minulache Private First Class 70 Rep 141 Posts Drives: BMW 4 F36 & E92 N55 LCI Join Date: Jun 2023 Location: Bucharest iTrader: (0)	I would go with belt tensioner, the 2 pulleys and belt before looking into the alternator. Had the same noise and it was from the belt tensioner
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05-29-2024, 12:26 PM	#4
whyzee125 Brigadier General 1995 Rep 4,023 Posts Drives: Dinan stage 2 335i Join Date: Jul 2014 Location: Chattanooga Tn iTrader: (0)	My friend's N55 had a similar noise and it ended up being his fan. The next most likely IMO would be your power steering pump.
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09-09-2024, 12:31 PM	#5
adill1 New Member 9 Rep 27 Posts Drives: 2011 335i Xdrive 6MT Join Date: Jan 2017 Location: NJ iTrader: (0)	whyzee125 thanks! Im leaning towards probably power steering pump as I recently flushed the fluid with CHF 11s, but the wheel still feels "heavy" and also there is some vibration in the steering wheel at low speeds around tight corners. Do you have any thoughts on how i could confirm a failing PS pump before DIY?
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09-17-2024, 12:19 AM	#7
darkfires102 Enlisted Member 18 Rep 49 Posts Drives: '11 335xi, '09 335xi Join Date: Oct 2021 Location: Colorado iTrader: (0)	Belt + tensioner and idler pulleys needed. Replace that mickey mouse flange with an aluminum one while you're at it before it leaves you stranded. __________________ 2011 335xi N55 6AT FBO + 2009 335xi N54 6AT BONE STOCK
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