The intake manifold cracked causing coolant to leak into all cylendars of the engine and even go as far as into the exhaust system. Lucky for me no damage happened to the engine, it was just an expensive and extreme inconvienence.

The intake manifold on my Pontiac cracked because it is made out of plastic. Water and coolant leaked into the engine causing the pistons to hydraulic. Water does not compress like gas. The starters nose cone shattered and luckly none of the rods bent. In doing research on some other consumer complaint websites, this is happening to my model and the Grand Am. It is a design flaw by GM but they are not doing anything about it.