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Re: Chasing an airmass deviation
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Posted by JustinHiFi [Email] (#829) [Profile/Gallery] (more from JustinHiFi) on Thu, 8 Dec 2011 05:31:21 Share Post by Email
In Reply to: Re: Chasing an airmass deviation, SWEDECAR [Profile/Gallery] , Wed, 7 Dec 2011 21:38:46
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Ahh okay. Wasn't clear to me in your fist posting.

Would excessive blowby cause a deviation? Trionic would calculate for a certain amount of air to expelled into the exhaust but if its leaking past the pistons into the closed crankcase it would be unmetered air. It would also explain some of your positive crankcase pressure when blocking off the checkvalve.

Had a '99 9-5 a few years back that I did the crankcase update on along with new hoses etc. Old were torn and completely inop. After, there was so much crankcase pressure even at idle from piston blowby it poured oil out the new front main seal. The only temp solution was to actually unhook the pcv hose from the valve cover at the trap. Just looked at RO at specifics. Vehicle had 161k miles, timing chain noise, random misfire code. No notes of airmass deviation. Client decided to trade it in to avoid pistons or engine replacement.

JustinHiFi

posted by 70.119.23... 
_______________________________________
JustinHiFi
Strictly Saab Inc.
Melbourne, FL

Current:
-1991 900 S-PG MT
-2001 9-5 Wagon AT
-2006 9-3 SS AT

Past:
-1964 96 2-Smoke MT
-1967 96 v4 MT
-1983 900 Turbo MT
-1985 900 SPG MT
-1988 9000 Turbo Black MT
-1988 9000 Turbo White AT
-1990 900 SPG Red MT
-1990 900 SPG Black MT 
-1991 9000 Turbo MT
-1991 900 SPG Red MT
-1992 9000 Griffin AT 
-2000 9-5 Aero Sedan MT
-2001 9-5 Aero Wagon MT
-2008 9-3 2.0T Sedan AT
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