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Re: 2000 Malibu Sounds like a diesel on Startup (cold)
it's piston slap. very common in that series of engines. only solution is new pistons. or just let the car warm up before driving it hard and deal with the knock. for some reason, the piston skirts bow in and causing the piston to slap around in the cylinder. when they warm up, they expand and straighten out and the piston guides smooth in the cylinder.
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