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Hi. I have a Demio with about 125K miles on the clock. It's developed a random loud knocking sound once the engine has warmed up and idling. When idling the knocks come at about 6 times a second but not regular. They don't get any louder from revving the engine - either that or other engine noise masks the knocking. After the revving the knocking disappears momentarily, like a few seconds, then returns. Average gap between knocks = 0.15 of a second although can sometimes be as much as half a second or as short as 0.07 of a second. It's loudest near to the pulley end of the engine. mp3 file is here: DemioEngineRattle DemioEngineRattle.mp3 Can some kind person suggest what the problem could be? Many thanks. Dan
 
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