Ford Focus Engine Noise?

  • Thread starter Thread starter ash
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ash

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I was checking the engine yesterday on my car and noticed that when I rev the engine I hear a hissing noise from the engine. Its only for a split second and then stops (there is no noise when the car is idling). Its more noticable if I press the accelerator quicker but again its only for a split second.
Its not the eghaust as I've checked this and my car had its MOT last week and they hadn't commented on this.
Any idea's what this could be?
 
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