jelloslug
Digital
What kind of shape are the timing chains and tensioners in? I know it's a long shot but they do sound really bad when they are worn out.
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What if its an internal problem? I know that wristpin can go bad. I have seen one where it was almost small as a pencil and was to be big as my thumb.But I'm still getting that knock at all rpms from what sounds like #4 cylinder with the stethescope.