It can either be a bad lifter or piston slap. Have a local pro look at it. The lifter will sound like a loud tapping noise and the piston will as well but not quite as loud and lower in the engine. The piston slap is nothing to worry about and the lifter will need all of them replaced. It cold also be a bent pushrod, but I kind of doubt that as it would make noise all the time.
Thursday, November 7th, 2013 AT 3:57 PM