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BRZ First-Gen (2012+) -- General Topics All discussions about the first-gen Subaru BRZ coupe


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Old 07-02-2022, 05:17 PM   #1
Yellow17BRZ
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Intermittent rattle

There is a intermittent rattle that is coming from my BRZ. At first I thought it was the alternator pulley, so I replaced the that, along with 1 tensioner pulley, 3 idler pulleys. Name:  A630DEFC-77D7-4EDE-A28C-63A0EC4808BA.png
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Size:  107.8 KB , everything that’s circled blue and red I’ve replaced. There’s also i video i attached, the thing is I can hear it more clear underneath the car.
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Old 07-02-2022, 05:19 PM   #2
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https://youtube.com/shorts/nWXu-scsHAg?feature=share
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Old 07-03-2022, 12:58 PM   #3
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Mine sounds similar, does it come and go with turning the a/c on and off?
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Old 07-03-2022, 01:12 PM   #4
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Probably the alternator itself, that grinding is muted enough that I'd assume it's internal to something (not a pulley bearing) but who knows
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Old 07-03-2022, 04:17 PM   #5
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Interesting one. More rattle than grind. Have you listened from underneath? Auto, or manual?
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Old 07-03-2022, 10:35 PM   #6
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Maybe the water pump is going bad.



I suggest you use the old long screwdriver to the ear to see if you can isolate where the sound is coming from.
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Old 07-03-2022, 10:41 PM   #7
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Maybe the water pump is going bad.



I suggest you use the old long screwdriver to the ear to see if you can isolate where the sound is coming from.
I thought about that but, man, if that sound was the water pump, I imagine it would be pissing coolant.
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Old 07-08-2022, 01:29 PM   #8
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One of my family members made the original post about the issue I'm having.

Few Clarifications:
-Replaced the alternator with another used alternator from Ebay
-Replaced Belt
-Replaced 2 Smooth Idler Pulleys
-Replaced 1 Grooved Idler Pulley
-Replaced Tensioner
-Manual Transmission for the 2017 Series Yellow BRZ

I find that the rattle comes one after the car warms up after a cold start. Also, it's more obvious when the AC compressor clutch engages, but I found any large electrical load brings the rattle back (Ex: I turned off AC but then turned on seat heaters and defrosters and rattle came back).

I usually can only hear the rattle that comes and goes while idle sitting at a light.

I was going to try to track down where the noise is the loudest using a Mechanic's Stethoscope and possibly going underneath and removing the shield and seeing if I can find anything rattling around...

Last edited by pvpman22; 07-08-2022 at 01:29 PM. Reason: forgot to add manual transmission
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Old 07-08-2022, 02:24 PM   #9
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I usually can only hear the rattle that comes and goes while idle sitting at a light.
Does it go away when pushing the clutch?
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Old 07-19-2022, 05:50 PM   #10
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pull the belt and run it for a few seconds like that. Then you will know if its from something belt driven, or something in the clutch, timing chain, valve train or other stuff
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Old 08-03-2022, 09:41 PM   #11
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Sounds like the alternator. You turn on AC, noise. AC off, no noise. Seat heaters and defrost, noise. Only way a seat heater and defrost would cause issues is a change of load in the alternator. AC would use more juice as well running the magnetic latch for the compressor, and your fan.

Especially since you've changed so much already. Could be bearing in the alternator starting to go and making noise when it's experiencing higher loads. Subi alternators are known to be one of their more frequently replaced parts over the life of the car.

My 01 Outback broke alternator bolts three times, but never made any noises.
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