Date: Tue, 15 Dec 1998 17:40:54 -0800 From: Justin VanAbrahams <jvanabranopsamnet> Subject: Re: '86 900T8, 110k
Hugh Fiske wrote: > > Justin VanAbrahams wrote in message <367576ED.25DAnopsamnet>... > >Hugh Fiske wrote: > >> > >> Last few weeks I've noticed a little 'mayonaisse' on the oil dipstick > >> (oil/filter change 2000 miles ago, semi-synthetic).. seems to coincide > with > >> an apparent 'breathing' problem where if I blip the throttle the revs > rise > >> then fall to about 500 rpm and things get a little rough, then rise again > to > >> idle speed of 1000ish. Are these observations connected? Where should I > >> start looking? The breather pipes I can get to at the top of the engine > seem > >> fine. Went to my local SAAB dealer today and they said the mayo is pretty > >> normal (?) and the rev drop would be cured by a spell on their crypton > >> machine.. thoughts anyone? > > > > > >Thought: Replace your bypass valve. It'll do that... > > > >-Justin > > Ok.. but what bypass valve and where is it? :-) Your bypass valve reroutes the intake charge from the throttle body to the intake side of the turbo when the throttle valve shuts. But it occurs to me that since you have an 8v car, it may not have one. The 8v cars in the states did not get them, but since we stopped getting 8v turbos in 1984 when they were replaced by 16v turbos in 1985 I don't know if they added them to later cars. Anyone know? -Justin
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