Redon

[Redon]

Why has my turbo (S12) 1.8...suddenly started whistling like a real high pitched scream?
Redon

[datdrift]

one of the gaskets has probably started to blow, keep driving it hard and it will soon sound like a tractor

[wacomuk]

or the turbo blades have been damaged

[northerner]

or could be an air leak possibly from that very thin pipe that goes from the joint at the brake booster to the Boost sensor near the turbo

[PukkaSilvia]

screaching is normally the turbo gasket just before as previously said it blows the gasket out and sounds like a tractor lol .

Try nipping up the 4 nuts up before she blows with a 13mm spanner


The nuts normally come loose because when the turbo has been changed the washers with tabs are not refitted before the nuts . ( they have tabs on them that bend down round the nut to stop the nuts coming loose)