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http://www.canadiandriver.com/articles/jk/020116.htm

Pretty good description of how the device works.

I think in your case it is not the purge valve. From what you describe I would indeed look at the O2 sensors and also your vacuum hoses. The O2 sensors going bad will cause stumbling in the idle but I am not sure if they would induce a spike to 2K. Thus, I am thinking you have a misconnected or degraded vacuum hose that could induce the spike. Your note of running air/heat also hints of trouble here. The HVAC demands vacuum so that is possibly a good clue.

You noted you've installed new hoses, can you confirm the connections are correct and that the hoses are sealed properly?

For the O2 sensors, they rely on resistance to function properly. Noting you've replaced the exhaust it might be worth a check to ensure the sensors are in good working order. Check all of the connectors, clean the threads of the sensors (to ensure good contact) and if you have a Voltmeter, check the resistance. Dean posted an excellent bit of wisdom on checking the O2 sensors, read that here:

http://www.saabnet.com/tsn/bb/9-3/index.html?bID=50750

The last item of consideration I could think of is fuel. The T5/T7 ecu's are very responsive in trying to compensate for a lack of proper fuel flow. I know when I had an injector clog everything went a bit whacko. Spiking idle, sputtering and after a while a CEL took me to the dealer for some time on the TECHII. #4 injector was sputtering. A $17 can of BG44K injector cleaner later, all is well and smooth. Also, have you checked the fuel filter?

Have you had the car hooked up to a TECHII for a peek? It might be a good one hour of labor to help track down the troubles more easily.

posted by 68.32.9...

• Back to the same old problems... hating my car...[+], Ros, Mon, 21 Apr 2003 11:45:16
  • Re: Back to the same old problems... hating my car...[+], Specs, Mon, 21 Apr 2003 21:12:30
  • My shadetree $.02, Chuck, Mon, 21 Apr 2003 20:55:04
  • Here's what the purge valve does and..., Drewser, Mon, 21 Apr 2003 19:30:21 <-- Viewing This Message
  • Re: Back to the same old problems..., Eric H, Mon, 21 Apr 2003 17:21:59
    • Is that something that my mech. does with the TECHII?nm, Ros, Mon, 21 Apr 2003 17:38:27
      • Re: Is that something that my mech. does with the TECHII?nm, Eric H, Tue, 22 Apr 2003 07:01:12
  • Re: Back to the same old problems... hating my car...[+], pursang, Mon, 21 Apr 2003 13:57:21
    • I'm not sure how many miles are on them, but from [+], Ros, Mon, 21 Apr 2003 14:28:50
      • With my 98 900 conv.. more, 97 Aero, Mon, 21 Apr 2003 14:39:05
        • What the heck is a "purged solenoid"? and I recalled [+, Ros, Mon, 21 Apr 2003 14:53:59
          • Re: What the heck is a "purged solenoid"? and I recalled [+, mlc , Mon, 21 Apr 2003 21:41:14
          • Too my knowledge, the solenoid is due., 97 Aero, Mon, 21 Apr 2003 15:47:38
            • What is a solenoid though? sorry... not familiar... [-], Ros, Mon, 21 Apr 2003 15:53:14
              • Ros unfortunately I can't recall the actual function nm, 97 Aero, Mon, 21 Apr 2003 16:07:09
                • BPC valve, Gabor, Tue, 22 Apr 2003 05:53:33
                  • THANKS for all the insight. I'll be sure to [+], Ros, Tue, 22 Apr 2003 08:25:06
                    • Re: THANKS for all the insight. I'll be sure to [+], John W, Wed, 23 Apr 2003 17:57:29

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