Date: Tue, 12 Apr 2005 19:06:41 -0400 From: P K <pakobnospamo.com> Subject: Re: Where is PCV on '86 900 8v?
In article <d3h4a5$r4k$1nospam3.zwoll1.ov.home.nl>, "MH" <nomailnospamere.no> wrote: > > > Only on the Turbo models, it's a thimble size plastic thingy in a vacuum > > > line from the valve cover to the intake manifold. > > > It was done on my 900 8v, NON-turbo. > > Are we talking about the same thing? > This is a PCV (positive crankcase ventilation) check valve; > http://members.home.nl/mhilvers/pcvcheckvalve.jpg > from my previous '87 900T8. (It's about 4 cm long x 1.5 cm wide, maybe a 1 > euro part.) > > My current '91 900i/16 non turbo, has no PCV valve, there is no need for it > as there is always partial vacuum in the inlet manifold, contrary to a turbo > where there may be overpressure. For the PCV to work, there must be a check > valve in the vacuum line to prevent boost pressure getting under the valve > cover and into the crankcase. > > My 900i actually has two vacuum lines; one thick one from the valve cover to > just before the throttle opening, and a thin one from the valve cover to the > inlet manifold. Both lines share the valve cover connection. The thin line > shares the manifold connection with the line to the carbon cannister. > Yep, that's what it looks like on mine ( again '86 900 8v NON-turbo). By the way, I re-seated the oil filler cap and valve cover nipple of above dscribed vacuum lines and the stalling problem went away. I remember reading soem where is there was a vacuum/air leak in this system that stalling/rough idling occurs. I guess that's correct. --Paul
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