Re: smoke on upshift - turbo seals vs other causes? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: smoke on upshift - turbo seals vs other causes?
Posted by John Myers (more from John Myers) on Mon, 12 Jul 2010 14:31:02
In Reply to: smoke on upshift - turbo seals vs other causes?, Keith Olson, Fri, 9 Jul 2010 09:22:55
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When you go from boost to throttle closed, the manifold goes into vacuum pretty quickly, but the pressure in the turbo is shunted back to it's inlet side by the turbo bypass valve. How much oil are you burning? It should be a measurable amount per week or at least per month.
The MAP sensor (via the ECM) turns off the fuel injectors momentarily on deceleration. So the only way you could get a rich condition on decel would be leaking injectors or a very small hole in the pressure regulator diaphragm and either of these would cause other problems on top of what you are describing.
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