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Uh, did you clean all the intake plumbing, turbo piping AND the intercooler in the nose. You are seeing residual remnants of the first turbo compressor wheel. Maybe you did clean these pieces, but have neglected to let us know. The intercooler is a design that lets foreign matter collect at the bottom of it. Have it professionally cleaned.
Ask me how I know this. The very same thing happened to me on my 951. I replaced the turbo, cleaned everything and ran cheap oil through it twice. These are very strong motors.... It ran great after that.
Good luck.
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'82 911
previous:
'86 951
'72 914
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