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. Thanks
--Paul
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
Yep, the stalling was corrected.
It was done on my 900 8v, NON-turbo.
That's strange. Neither of my running 8V NA C900's have PCV's in the cylinder head breather line, but since Saab made 8V C900's right up until
1988 or 1989, they might have been fitted on cars made in the last few years for all models (not just those with turbo's)? Just a thought.But the question is then why would a non-turbo 8V engine need a PCV - anyone privy to inside Saab design knowledge of the mid to late 1980's able to shed some light on this?
One possibility - the engine might have originally been fitted with a turbo but had it removed even though the PCV was left in. This sounds fairly unlikely but it is a possibility.
Craig.
Are we talking about the same thing? This is a PCV (positive crankcase ventilation) check valve;
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.
-- MH '72 97 '77 96 '78 95 '79 96 '91 900i 16
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
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.
-- MH '72 97 '77 96 '78 95 '79 96 '91 900i 16
This might somehow relate to the problem I've been having with my 8V NA 1985
900i which idles very slow when cold, and is fine once the engine warms up. I already have replaced almost all the small-bore vacuum hoses with silicone ones (testing the old ones as I go to see if they're cracked or blocked, but none have been), and I have found that the +12 volt feed from the fuse panel coming from the fuel-pump relay to the warm-up regulator and auxilliary air valve is broken, but jumpering around that with a new piece of wire made those devices work, but the engine idle is still far too low (around 500 rpm) when cold.Some of you would have been following the thread I started at Saabscene about it which can be found at:
Regards,
Craig.
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