Rattling sound after downshifting - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

hpde_addict · 03-05-2018, 02:09 PM

Yesterday, I downshifted to 4th on a cold transmission, using more force to shift then I should have. I was going around 70-75 mph. Not sure if I accidentally money shifted to 2nd. I didn't notice any overly loud rev sound or feel any wheel spin. Immediately on entering the turn, I applied throttle and heard a loud metallic rattling sound coming from the left air vent. The more throttle, the stronger the rattle. No sound at cruising throttle. Today, I tried again and was able to reproduce the rattle. Is this a sign of over rev?

humfrz · 03-05-2018, 02:50 PM

I would think that if you had over revved the engine and it didn't like it ...... you would hear more than a rattle coming out of a vent.

humfrz

hpde_addict · 03-05-2018, 06:59 PM

Went for a drive to try and reproduce it. Warmed up for 10 minutes and did a few full throttle pulls. Wasn't able to reproduce. Maybe some interior part got agitated in the cold.

humfrz · 03-05-2018, 10:04 PM

Quote:

Originally Posted by hpde_addict

Went for a drive to try and reproduce it. Warmed up for 10 minutes and did a few full throttle pulls. Wasn't able to reproduce. Maybe some interior part got agitated in the cold.

Yes, that's it ....... the air direction vanes in the left vent just got pissed off because they were cold ...... then they were happy again when they got warmed up.

See there ....... the "fix" is to let the car warm up ..... before you go hot rodding around .....

humfrz

03-05-2018, 02:09 PM	#1
hpde_addict Senior Member Join Date: May 2015 Drives: '18 Camaro V6 1LE Location: SF Bay Area Posts: 161 Thanks: 57 Thanked 47 Times in 31 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	Rattling sound after downshifting Yesterday, I downshifted to 4th on a cold transmission, using more force to shift then I should have. I was going around 70-75 mph. Not sure if I accidentally money shifted to 2nd. I didn't notice any overly loud rev sound or feel any wheel spin. Immediately on entering the turn, I applied throttle and heard a loud metallic rattling sound coming from the left air vent. The more throttle, the stronger the rattle. No sound at cruising throttle. Today, I tried again and was able to reproduce the rattle. Is this a sign of over rev?

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03-05-2018, 02:50 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,872 Thanks: 28,793 Thanked 31,827 Times in 16,429 Posts Mentioned: 708 Post(s) Tagged: 2 Thread(s)	I would think that if you had over revved the engine and it didn't like it ...... you would hear more than a rattle coming out of a vent. humfrz

03-05-2018, 06:59 PM	#3
hpde_addict Senior Member Join Date: May 2015 Drives: '18 Camaro V6 1LE Location: SF Bay Area Posts: 161 Thanks: 57 Thanked 47 Times in 31 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	Went for a drive to try and reproduce it. Warmed up for 10 minutes and did a few full throttle pulls. Wasn't able to reproduce. Maybe some interior part got agitated in the cold.

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