* Engine Misfiring It is possible for the timing chain to stretch with time, and the chain skips a gear either on the camshaft or on the crankshaft. The engine’s timing will be out of calibration and you hear the classic misfire sound. * Engine Light is Illuminated When the timing chain is stretched, it makes the engine perform poorly and so the engine emissions are increased. This triggers the engine light to come on. * Rattling Noise When Idling Unusual sounds are a reliable warning sign that something is going wrong. when a timing chain is working its way loose, it causes vibration inside and this sounds like a rattling noise when the engine is idling. * Engine Failure If the timing chain breaks as you are driving, the engine will stop and you will break down. If your car is parked up at your home and the chain is broken, the engine won’t be able to compress enough air to get it started.