The only way that you know for sure if the timing chains is loose, is in the morning when the engine is cold, pay attention to the noise will come from the back of the engine(driver side). Thats the only way you will know, once the engine warm up it will shut up or less noisy. If the noise persist with the engine in temperature (HOT) you should think in replace them. Dont push it to hard when the engine is cold. Hope this help ciao