Volvo Repair: 93 940 (non-turbo) no start, rex regina, air control valve

Question
I have a '93 940 sedan non-turbo (B230) with 150K miles that will not start.  This is a Rex/Regina car.  I did a basic check of the ignition system (my timing light would flash when cracking the engine) and the electrical voltage is fine at the ignition coil.  I did a diagnostic check of the engine system and came back with 1-1-1 (no problems) for the ignition system check and 2-2-3 (bad air valve) on the fuel after which I subsequently cleared the codes, cleaned the throttle body and air valve per instructions some instructions I found on "swedishbricks.com" without any effect (still no start – turns over fine but no start.)  
Questions:
1)   Should I check the fuel pump/fuel pressure system before going any further?  If so, what is the easiest way to do that?  
2)   Should I go ahead and but an idle3 air control valve and try that?

Additional facts/comments:
1)    Couple of days before the car stopped running, it quit while the car was costing to a stop as it approached a red light.  However, the car re-started immediately.
2)   The vehicle’s idle speed has been slightly erratic for years (+-50 RPM) but no other idle-related systems.
3)   I replaced the camshaft seal, timing belt and water pump about one month ago.  The car seemed to run fine until this problem but I have only been driven about 40 miles since by earlier repairs.  (It is my daughter’s car and she is away at college.)
Thanks for any help you can suggest.

Henry


Answer
   Yes, definitely a fuel pressure test first and foremost. A bad idle control valve will NOT affect starting. You need to buy/borrow a fuel prssure guage with the appropriate adapters to do any good at all. You can try cracking the feed line at the rail and crank. This will only tell you if there is no fuel, not if it's enough fuel and pressure and volume. NOTE! Due to the high flammability of raw fuel leaking on the engine. I would be prepared with an appropriate dousing device (read fire extinguisher) before attempting this. Try it on a "COLD" engine.

Mark

  Idle air control valve may help stalling.

Mark