Quote:
Originally Posted by arpad_m
As stated above, sudden loudness changes are due to the NPP valves opening and closing, there are several rpm-specific tables that control the valve position. Fuse 51 is the fix if you want it loud all the time.
As to the rattle, I can't hear it in your video, but these are the potentially applicable TSBs. I performed them on my car, no NPP rattle since doing the second one.
16-NA-003
18-NA-172
I know these are older documents (I don't keep updating them, given I have a 2018), but I don't think gm changed anything about the exhaust since 2016/2017. |
First one is not applicable - opening and closing valves is fine, some metal on metal noise but nothing to complain. Second one might be applicable, although I heard people's rattle and it was on idle - my car needs to get into some resonance in order to hear it. It's like you put two thin sheet metal pieces side by side and blow something on it... it kind of reminds me of beer can buzzing sound. Maybe I like beer too much
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2023 Kia Stinger GT AWD - as a family car...
2022 ZL1, M6 as daddy's ass mover
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