7.3 idi knock

[Meettaa]

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Has a knock, weak valve spring?

 

[Meettaa]

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[no mufflers]

looks fine to me. a weak spring wont cause a knock like that, and you would hear a chuff in the intake or exhaust. that is either fuel or something down inside.

 

[KCMeyer]

I hate to say it, but that almost sounds like a wrist pin.