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A friend and I bought a 99 EMS at a tow company auction a few years ago. As we I was towing it to my house to work on it, he stuck one of the 6 SAAB keys in his pocket into the ignition, and it turned, so he popped the clutch and it started. We spent the day driving it around, and it became his daily driver for a while.
A couple months later, it wouldn't run. I went out to take a look at it, and found that if I pressurized the fuel pump, and tried to lift the air flow plate, I met a lot of resistance. I got to looking at the fuel injection part of the manual and trying to figure out how the fuel flows through the distributor. I realized that there was a pressure imbalance between the top of the fuel flow plunger and the bottom, and that pressure was resisting my ability to lift the plate. There's a plug screwed into the side of the distributor that has a spring loaded piston under it. This is the pressure regulator, and bleeds off excess fuel pressure. Inside that chamber there is a small orifice that allows the pressure between the top and bottom of the fuel flow plunger to equalize ... thus allowing one to lift the plate with ease under normal circumstances. (That plate has to be able to lift with the slightest amount of air passing around it ... when the fuel pump is running.)
Anyway, we flushed that chamber with carb cleaner, trying to direct the spray at the orifice, and eventually got it cleaned out enough that the air flow plate functioned properly. Once we got it cleaned, it never gave him another problem.
posted by 71.214.89...
, Sat, 24 Jan 2009 09:48:23, Sat, 24 Jan 2009 09:58:43, Sat, 24 Jan 2009 20:35:45, Sun, 25 Jan 2009 21:36:43
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