The screw that ted is referring to is on the front of the engine. I labeled it in the image below (engine is a 5spd '88 900 S which will be very similar but not identical to your car)

Bleeding the coolant system is easy:

(1) make sure you have diluted antifreeze (the normal 50-50 ratio of water to antifreeze) on hand
(2) open the coolant reservoir cap
(3) loosen the coolant bleeding screw and then add coolant to the reservoir until a constant stream of (probably neon green) coolant comes out of the bleed screw.

The bleed screw is copper colored and looks like a straw that bolts into another larger bolt. To open the bleed screw you hold the bottom bolt steady with a wrench and then loosen the top straw/bolt with another wrench. Crescent wrenches are useful for this task.

I wish that I understood the details of the fuel injection system, but I havn't take the time to learn that yet. I am not qualified to answer your questions about erratic idle. My WAG is that the O2 sensor affects primarily the amount of gas that's injected into the cylinder (it is used to calibrate fuel delivery by sampling the amount of O2 residual after combustion - it is screwed into the exhaust pipe) I think that it is certainly conceivable that a fouled up sensor would lead to improper gas delivery, which in turn would lead to erratic idle and stalling. Please note again that this is a guess.

I would advise you to seek out a book that talks about your car. Both Haynes and Bentley make a decent manual for the 900 and I know both companies produce readable manuals. Reading through one of them will give you a better idea of how to talk to your mechanic - or solve the problem yourself. The bentley manual is sold by amazon (http://www.amazon.com/gp/product/0837603137/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0837603137&linkCode=as2&tag=thesaabnetwork)

email with more questions if you'd like

NT

posted by 128.101.25...

• Motor mounts changed, now "check engine" light is on..., Julia, Sat, 26 Jul 2003 05:35:20
  • The car having been "upside down"?!?!?!?!?, RS , Sat, 26 Jul 2003 15:37:42
    • Thank you, RS, but..., Julia, Sat, 26 Jul 2003 19:10:26
      • Re: Thank you, RS, but..., RS , Sat, 26 Jul 2003 19:27:21
  • The O2 sensor can be definitively tested w/an, LM, Sat, 26 Jul 2003 09:29:19
  • Re: Motor mounts changed, now "check engine" light is on..., andy , Sat, 26 Jul 2003 06:39:48
    • any ideas anybody?, Mark, Sat, 26 Jul 2003 08:58:10
    • To ANDY re: Motor mounts/ "check engine" light, Julia, Sat, 26 Jul 2003 08:49:38
      • Uh oh...now the temp gauge is riding HIGH..., Julia, Sat, 26 Jul 2003 15:28:15
        • Re: Uh oh...now the temp gauge is riding HIGH..., Ted, Sat, 26 Jul 2003 21:28:26
          • Thanks, Ted...how would I fix that?, Julia, Sun, 27 Jul 2003 05:17:39
            • coolant bleed screw, nt moore, Sun, 27 Jul 2003 21:58:04 <-- Viewing This Message
        • I assume that you've been checking the coolant level?, nt moore, Sat, 26 Jul 2003 20:43:51
          • Re: I assume that you've been checking the coolant level?, jfsegre, Mon, 28 Jul 2003 21:21:28
          • P.S. Important, Re: symptoms of a bad O2 sensor..., Julia, Sun, 27 Jul 2003 05:29:33
          • Thanks, nt moore...I will check all of this, but..., Julia, Sun, 27 Jul 2003 05:23:05

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