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Strange wooshing sound on acceleration

Ned_Mk2_1.8tdci
Ned_Mk2_1.8tdci
in Ford Focus Club

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Happened recently, when car is running over 2k rpm and I'm accelerating (gas pedal pressed) a strange noise, like a deflating balloon appears from the ventilation grille. Tried with the car at standstill but all runs fine. 

Did check the ventilation ducts for any obstructions, engine hoses for a possible crack but all is fine. 

Noise appears only when driving, over 2 k revs, ventilation and AC status makes no difference.

Any ideas what to look for next please?!?!

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    Check the intercooler pipes around your throttle body and both sides of the intercooler. If one of these has split it will do exactly the fault you're describing 👍

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    A split in one of those rubber hoses won't exactly leap out at you. The woven lining will hold the split rubber together until under boost pressure the split will open up, hence you getting the noise at 2krpm +

     

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    • Like 1
    • Author

    Thanks Luke, Nick!

    There was a crack in the 'elbow hose' btw the ERG and the metal pipe (Ford p/n 1496238). With help of a friend I kept engine running at 3krpm, found the split  quickly. Hose replaced, now all is fine. Let's hope it stay like that!!! 

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    • Like 3

    That's a novel way to locate a split! Thanks for the update, glad it's sorted 👍

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