Hello all,
I just got 2011 35i with 180k miles few months ago. After installed spark plugs, ignition coils, idle tensioner, belt, pulleys. Car runs great for couple months. Now it start having either vacuum leak or something else. Car start up great when engine cold…drove for about 10 minutes when engine warm up…I heard load (really loud whistles noise toward near transmission (flywheel area). It go up and down along when I accelerate. The idle also go up and down as the same time. Its only happened when the engine getting hot (whistles noise and idle). Car still operate as normal when this happens. Is this a vacuum leak or turbo issue? Any input will be appropriate. Thank

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Current Garage
2003 Black 4.6is
2001 Silver 528i
2008 Civic Hybrid

Previous German
1994 740il----give it away for free
2001 X5 4.4---Trade
2001 325i-----Sold
2004 325i-----Sold
2006 330i-----Sold
1994 Audi 100-Sold
1997 Audi Avant-Sold
1996 Audi A4--Sold
2002 Audi A6--Sold
1999 Benz S320-Sold
2003 Benz E320-Trade