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VW Polo 6C 1.4TDI (2014) 3 Cylinder Strange engine noise
Engine code CUSA and mileage 102,000
Engine Noise when warm around 1800 - 2000RPM
No Fault codes. or any other issues.
So far its had Turbo and Actuator, EGR flap, N47 relay,
EGR large 'O' Ring gasket.
Can't feel any escaping air from Turbo, exhaust / manifold, breather or intercooler.
It appears to be after engine is warm and gets worse as it gets hotter from a long run.
It sounds like its coming from the Drivers side O/S. checked Serpentine belt and crank pulley and they appear to be OK. Can't see any pipes leaking or Cables vibrating. Engine mounts seem OK.
Cambelt was renewed by dealer not looked at that. Alternator pulley appears to be OK as does A/C.
No noise from flywheel at all not even when in neutral hot or cold. It sounds like a trombone noise and a little vibration but not on any pedals,
this is the same driving or in neutral.
Any ideas or if someone else had similar issue and cured would be much appreciated?
Thanks for watching