Re: About out of ideas, anyone have any? - Saab Saab Model 99 Bulletin Board - Saabnet.com
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Re: About out of ideas, anyone have any?
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Posted by Don Wollum [Email] (more from Don Wollum) on Sun, 5 Sep 2004 03:54:16 Share Post by Email
In Reply to: About out of ideas, anyone have any?, 79-900t [Profile/Gallery] , Sat, 4 Sep 2004 21:48:52
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Bruce, then problem sound like the warm up regulator, this is the "choke" as it were when cold, and as warming up primarily with a heating element it leans the mixture to normal. If you consider its "TOTAL" effect on mixture change from 0-10 , this translateds to 1 being 32F cold, and after 3 minutes of electrical heater bi metal spring has moved to its normanl operating setting of 6. This is very important to realize!!6 is as far as a WARM ENG as it can go...When a mechanical fault with the pressure valve occurs as I suspect yours has, the setting is "10" and 80% LEANER than intended for a warm engine. This is theory. In real life you can only measure the "Line pressure" (below the fuel distributor plate tin plate VS 'Control PRESSURE" ( WARM-UP REGULATOR). CIS gagues have a screw shut off valve to let the tech view either value. Line pressure is approx 5 bar and control pressure is approx 3 bar warm engine, (1 bar cold). Long/short of it change the warmup regulator. and please do not turm the adjusting screw that much , if the regulator gets you going please3 followup with a CO adjustm3ent from a shop, or weld in an O2sensor to do your own setting up.
Ther is a one way check valve above the rear axel that can get stuck and BLOCK the whole return flow to the tank and All pressures up front are severely effeced. Note if this little diaphram blew physically, it can lodge and block the discharge tube going into the tank, check that its clear too if the valve is a problematic.

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