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Engine knock on start up, under load, & shut down

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Hello All,


I have recently gotten a knocking sound when starting up my silvia, it goes away on idle but once you rev it and also while shutting down you can hear it. Yes i have looked at every thread and video i can find but they're all consistence knocks while mine is quite on idle. We thought it may be the tensioner but no luck after changing that. We suspect the noise is in the manifold but very hard to pinpoint. The belt is also very tight. Here is a video of it turning on. Thanks!


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