Thread: engine rattle on cold start up

just thought i would update that the pontiac dealer replaced all lifters pushrods and rockers

Could just be the lifters needing to be pumped up with oil, when its very cold out, the oil is thicker so to say, and takes a little while longer to circulate, this is normal.

Could also be piston slap form the piston skirts, as soon as the pistons warm up and expand, this stops. Normal.

Could also be the supercharger rotors, same thing, once they warm up they will expand and quiet down. Normal.

Or...you had a collapsed lifter or two, this happens as well.

~F~