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Old 01-09-2022, 09:44 PM #1
fbtn007 fbtn007 is offline
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Engine popping sound when shutting off

Hi all, my 2021 4Runner having this popping or knocking sound when I shutting off the engine. I can hear it almost every time when shutting it off.
I'm sure it from the engine compartment or somewhere near the radiator.
I have uploaded a video and you can hear it in the end. Please help

2021 4runner engine popping sound when shutting off - YouTube
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Old 01-09-2022, 11:26 PM #2
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Sounds like the air pump.... maybe a check valve?
Normal
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Old 01-10-2022, 01:24 AM #3
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Secondary air injection pump. Totally normal.
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