If it's the same engine used in the 1990 version it has a belt driven cam on both 1.6 and 1.8, if it's a 1.6 the fuel injection pump is gear driven, whereas the 1.8 has another belt seperate to the cam belt to drive just the pump.
This is why you can't find the chain, as for a muffled rattle, I would be checking the basics first, has performance suffered, as they are not unknown to kill a valve or two.
tabetha