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^^^That is a good question. A loose chain will more than likely jump the cam gear and throw the timing out of place.As far I know, the only sign of a problem you 'll receive is when the engine blows as a result of this. However,this isn 't a likely scenario with the 4.6. The weak link in the timing chain set up isn 't the chain but the chain tensioners. Signs to look/listen for would bea ticking sound. Check the stickies for more information on this.