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I have a 2000 tundra and it knocks on startup. I spoke to Toyota and they said a high milage engine can have piston skirt issues. They get thin and cupped but it is not a fatal problem and he said just let it quit knocking before you drive it. Lower milage engines can have sludge on the valve guides and this will cause the valve to knock (the valve is not opening all the way and causes it to knock when closing) He said to get some bg's oil additive and it would probably clean the valve guide after a few days and quit knocking. Hope this helps.
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∙ 12y ago
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