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Focus 1.0 Ecoboost misfire and whistle

RMVS
RMVS
in Ford Focus Club

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Hello,

I just replaced the head gasket and wet belt on a 1.0 Ecoboost. I am certain the timing is correct. All tools locked in etc and lined up perfect.

However, at idle there is a misfire but there are no codes!

The car drives so smooth up to around 50mph then you hear a whistle sound. The car can then accelerate to 60/70mph and seems to not want to go any faster.

I have carried out a smoke test and there was no leaks. There is also no play in the turbo.

Any help would be appreciated. Thanks

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