Tow or Drive - Engine Knock

[mark9207]

Saturn engines actually use a timing chain rather than a timing belt. They are based heavily on the Quad Four engine design, which also used a timing chain. With a noise like that, I would highly recommend having the car towed to a repair shop. This noise very well could be a timing chain on its way out (this is not uncommon on these engines), and while replacing the timing chain will not be cheap, it will be cheaper than replacing the timing chain, valves, and any other incidentals should the chain fail completely. This is an interference engine, meaning lots of damage if the valve timing goes out of sync.