Ford Focus 2500cc

[Adrian67]

Hi , got a Ford Focus 2500cc Volvo engined car in today with a nasty squeal when it's hot , after removing the oil filler cap it stopped and it seems that the engine is drawing its air through the engine breather system , is this a known problem for the throttle body to stay closed although it appears to operate and is not sticking and there are no other blockages ?

[Adrian67]

Hi , thanks for your help , much appreciated !