I think I neeed to replace my PCV check valve, again.> Last time my mechanic did the job, to solve stalling at idle.

Now it seems to be happening again, and he is now too far away?> Is this an easy do-it-youtself job, just a part swap?> I looked at the valve cover area to try to locate, but no luck.

Did that solve anything?

Only on the Turbo models, it's a thimble size plastic thingy in a vacuum> line from the valve cover to the intake manifold.

--> MH> '72 97 '77 96 '78 95 '79 96> '91 900i 16> http://go.to/saab96­>

In article <d3eknk$36m$1@news5­.zwoll1.ov.home.nl>,­> "MH" <nomail@nowhere.no>­ wrote:

It was done on my 900 8v, NON-turbo.

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.>

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.

Yes, that's what cured it, not replacing the check valve. A non turbo should>run fine with or without it. Furtunately it's not a E200 part...

Obviously, if there is an air leak somewhere behind the throttle body, the>mixture gets too lean and the engine will starve, specially at low rpm.