Rattle / Light knock astra ts
Hi guys, Ok it has me stuffed, can not for the life of me figure out what the new rattle/knock is, Not the common astra injector or tappets noise, this is,sounds like bottom end somewhere, not big end, it would have a a deep knock, it sounds like theres a nut rattling around in the motor, or kinda like a timing belt pulley is about to fall to bits, but i have checked them and water pump bearing, its not a good sound at all. bit like piston slap on number 1. but it runs fine no smoke, anyone had same prob???