There are 2 engines 2.0 / 2.3 and they both have chains if you are getting a rattling sound from the cover front the guides are worn or the chain tensioner are worn the guides have nylon chain runners on them and if they wear down the chain is rubbing against the metal arm that the nylon is mounted on if this is a high mileage motor I would suspect this because the chain can not be kept tight because of the worn guides have now caused the chain to be slack and its rubbing against the front engine cover but you must be sure before opening it up that its not the water pump or belt tensioner pulleys making the noise if that's what your hearing the water pump will sound like a marble tumbling around in a can the pulley's will sound like constant friction grinding of the dry bearing inside against the bearing race there also may be a chirping sound of the belt being made from it grabbing each time the bearing catches inside and releases the chain will sound like a constant rattling as if you drag a metal chain on a ceramic tile floor and engine running condition will be rough idling and missing a bit especially when you come to an abrupt stop it may stall