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Engine knock from cold air intake reflash

By Toolman4
September 21, 2021 in 2019-2026 Silverado 1500 & Sierra 1500

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Toolman4

Posted September 21, 2021

Posted September 21, 2021

So i did the recall for ecm reflash on my at4 with cold air intake. Gm did it under warranty. My mileage definitely increased but i am now getting a knock at low rpms. Only right after it shifts. Put premium in it and same thing. Doesnt do it when at cruising speed or on it hard... just right after an easy shift. Its very slight, but never had the issue before the flash and it ran great. Anybody else notice this?

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