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04-15-2022, 09:00 AM
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#1 |
 
Drives: Chevy Camaro Join Date: Jul 2020
Location: Upstate South Carolina
Posts: 4
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AFM Squeak
Hello everyone. This post is to let everyone know about an issue i was having with my camaro and the fix for it. My 2020 2SS with performance exhaust (30K mi) recently developed an AFM "squeak" when changing from V8 to V4 mode. From a cold start the system sounded normal with the short "whooshing" of air sound it normally does, to a squeak when everything has warmed up. Took about 10 to 15 mins of driving to get to that point. The dealer confirmed it was caused by the baffle system in the muffler and replaced the muffler. So far so good.
Last edited by Romoon; 04-15-2022 at 12:20 PM. |
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04-15-2022, 11:19 AM
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#2 |
     Drives: 2017 Camaro 2SS A8 Join Date: May 2019
Location: USA
Posts: 1,656
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The NPP valve is in the muffler and by replacing the muffler it fixed the AFM valve?
__________________
Roto-Fab w/sound tube delete, Katech ported TB, Pray IM, Velossa, DD side markers, DSX FF, UPR Catch can, Halo brace, My custom vent gauge pod
Originally Posted by arpad_m - “Aww, yet another oil thread with almost the same question in the OP“ |
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04-15-2022, 12:15 PM
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#3 |
Drives: 2023 2SS Convertible Join Date: May 2009
Location: Metro Detroit
Posts: 1,061
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My car had a squeaky valve - it was a one second or so long metallic scraping sound. It would chirp when I was going into corners and randomly when accelerating and decelerating. I bought a can of dry lubricant from the dealer, sprayed into the valve housings with the little straw, and it is gone. There is a service bulletin out there too.
The NPP valves can also rattle, and that is a different issue. It literally sounds like a rattle at idle though. -Geoff
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'12 2SS RS Convertible - Traded in.
'16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold! '23 2SS Convertible -Same as above except orange. |
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04-15-2022, 12:19 PM
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#4 | |
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Drives: Chevy Camaro Join Date: Jul 2020
Location: Upstate South Carolina
Posts: 4
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Quote:
Quote from the dealer:"Tech confirmed the baffles in the exhaust are causing the noise. We have to replace the muffler assembly." The squeak I heard was coming from the front of the vehicle (dash area). I'm not sure how the system works, but the new muffler assembly seemed to have fixed the issue. |
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04-15-2022, 12:26 PM
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#5 | |
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Drives: 2017 Camaro 2SS A8 Join Date: May 2019
Location: USA
Posts: 1,656
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Quote:
__________________
Roto-Fab w/sound tube delete, Katech ported TB, Pray IM, Velossa, DD side markers, DSX FF, UPR Catch can, Halo brace, My custom vent gauge pod
Originally Posted by arpad_m - “Aww, yet another oil thread with almost the same question in the OP“ |
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