Noise from motor when driving ?

I have a Ford Focus 1.8 petrol (UK) and when driving I can hear a hissing or whistle sound when the revs are between something like 1250 and 1500 rpm.
When I rev the engine in indeterminate there does not seem to be to be a noise contained by that rev range. Does anyone hold any ideas as to why the echo is only present when driving surrounded by a gear ?

Car making grinding rumble??



Answers:    Your problem is you bought a FORD. Try buying a Chevy so you don't have to traffic with these problems.

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sounds approaching air coming through a vent as you drive check your nouns intake vent pipes there could be split surrounded by one

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