Quote:
Originally Posted by j cAT
that is not a knock but a tick . tick like a lifter is bad or bad valve spring . sounds like one cylinder .
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I would also describe the sound as a tick more so than a knock. It could be a lifter, but I was thinking it might be an exhaust leak around one of the exhaust manifolds, and the ticking noise is being caused by the leaking exhaust gases hitting the heat shield. The fact that it goes away/gets quieter after it warms up is what makes me lean toward an exhaust leak. It's hard to determine the source of the noise in the video though.