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Mk7 fiesta engine noise


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My 2010 1.25 fiesta zetec has developed a horrible squealing noise under power which has got worse over time. It does it in neutral when I'm not moving so I know it's not any wheel bearings or anything to do with the transmission. Me and a mechanic removed the auxiliary belt to see if it was any pulleys on there but it still made the noise. We then changed the water pump, cam belt and tensioner and its still there. Even had the exhaust off in case something had come off inside as it almost sounds like a whistle but still no luck. We're completely stuck and don't know what to do next so if anyone has any suggestions that would be great! It's on 46k miles and has been doing it since about 40k and had a full service in between so we really don't know what else it could be. Any help is going to be appreciated!

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