Just started to notice a whistle like noice at idle on the T6.
Dissapears on acceleration but is there as soon as you take foot of accelerator. No obvious signs of air / vaccum leaks, performance is ok.
I did think maybe PCV firetrap/ pipework but removing filler cap makes no diffrence. Also its intermitent so is confusing if it is a leak.
Any ideas anyone, its driving me mad.
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