I have a question concerning a Ford Focus 1.8 ZETEC E which has done 71 000 miles.
The problem is that when the engine is cold and I am in neutral and I rev the engine up to say 2000 rpm and listen as the revs come down, at about 1250 rpm there is a hissing type sound which is not there at any other rpm. I can hear the noise as well in all gears when driving but only when the revs come down to about 1250 rpm.Strangely when the engine is hot and the car is idling in neutral, there is no noise when at 1250 rpm.I have taken the car to a ford garage for an opinion and they seem to think that it is an emission system hose that is damaged or leaking. I am worried because on my recent service, the garage overfilled the engine oil by 250 - 500 ml (which has now been corrected), but could this noise be connected with this ?. When I posted this question before someone thought that it might be a Shield bearing at the bottom end of the pistons. If it was something serious wouldn't the performance be affected?. Can anyone help ?
Edited by Dynamic Dave on 21/12/2007 at 12:39
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