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I have a Seat leon SETDi 1.9, recently when accelerating the turbo makes a whistling noise, around 2500rpm onwards. This only happens when the engine is under strain (or accelerating)
This is not effecting performance or fuel consumption.
Had the visual check of the hoses and there appears to be no visible evidence of loose or leaking hoses.
Any thought ?
Is it a little like a siren? If so it may be the turbo on its way out.
More of a whistle, if it was on its way out would it not get louder ?
is that not just the air rushing in because you are ragging it?
Probably a boost air leak somewhere. Have a look around the intercooler/hoses for any fresh looking oily patches that look as though oil has been blown out (the oil is perfectly normal - the crankcase ventilation gases/oil mist gets drawn before the turbo).
And check that all the hose clips are tight.
have you driven through any streams recently - i managed to damage the intercooler (mounted under the radiator) on my 1.9 VW a few years back by foolishly doing that which needed replacing. Fortunately not the turbo but still an expensive enough experience.
Cheers guys, had a look around and found that there is a lead in the exhaust just before the cat. 3 year warranty on the exhaust system so getting the cat replaced. Kwik-Fit no quibble replacement, bonus.
Anyway hopefully that should the problem, if not back to square one....