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smoking at idle 700 1990

posted by  basher on  Wed Oct 20 09:24 CST 2004
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i have a 1990 760 turbo that smokes at idle. at 15000 revs and above it runs perfect.as soon as the revs drop below this i get loads of blue smoke . i have cleaned the breather and related hoses .can anybody help please








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Most likely turbo seals. 700 1990

posted by  someone claiming to be JohnB on  Fri Oct 22 02:27 CST 2004 [RELATED]

Yes, it could be other things, but nine times out of ten it's the turbo.

Probably from running the engine above 15,000 rpm.








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smoking at idle 700 1990

posted by  Steve on  Wed Oct 20 09:57 CST 2004
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last visit: Fri Oct 24 07:16 CST 2014
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That means it is sucking oil at high idle manifold vacuum. Suspects: valve stem oil seals, non-functioning breather system, possibly worn rings. Have you done a compression test?








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smoking at idle 700 1990

posted by  basher on  Wed Oct 20 18:56 CST 2004
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thanks steve no i hav/nt done a compression test but i will. the spark plugs are clean .no sign of oil fouling .i soaked the breather box in diesel overnight . the vacume hose was clogged solid so i renewed it. not sure if problem is engine related / turbo related / breather related . any advice thanks







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