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A worn cambelt tensioner can tick sometimes, and also the auxillary belt tensioner ball race can dry out and can make a hell of a noise it may well help, it surely won't hurt can a bad belt tensioner cause rough idle yes you can save hundreds of dollar by replacing car timing belt at home or in office or find some mechanic for replacement but. A serpentine belt is one of the most crucial parts of the engine. This one belt is like a snake attached with many parts inside the engine. If the serpentine belt somehow loses, it will cause various problems, including rough idle.