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Video please. The diesel noise makes me think chain guides. If so, you are risking throwing the chain every time you run the engine...
You don't have a DISA valve, that's only the 3.0's.
It could just be a pulley, I've definitely heard some noisy/grumbly idler/tensioner's before. That would explain the squeak.
I wouldn't worry about the squeak or whistle until the diesel sound is fixed. Hopefully it turns out to be the cause of the other two.
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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i
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