[Main Saab Model 99 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Re: Check condition of compensating resistor Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by JohnT [Email] (#1654) [Profile/Gallery] (more from JohnT) on Tue, 11 Jan 2005 04:36:12 In Reply to: Re: Check condition of compensating resistor, John Blas, Sat, 8 Jan 2005 15:20:56 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

It misses at all speeds including idle. It's not regular, more of a stumble or stutter. The throttle switch checks out. Once the car is warmed up I can disconnect warm up regulator, cold start injector, aux air valve etc. with no change. I have checked thoroughly for vacuum leaks. O2 sensor is new and the whole lambda system appears ok: I went through the troubleshooting routine in the factory manual. Lambda ECU is correct pn. I originally had a lambda ECU from a n/a car. After I changed it there was no change in the rough running condition but it gave me a much wider range of mixture adjustment. No I haven't had it checked professionally. I need to do that, just been too stubborn/lazy/cheap. I guess my reasoning is that I should be able to find a mixture adjustment by trial and error that would at least make the car run smooth. Whaddya think?

Other things I have checked:
cam timing is ok and correct pn
distributor seems ok and timed at 20 BTDC. vacuum advance does not leak
new cap, rotor, plugs, wires, *twice*
replaced inductive coil in distributor.
replaced ignition module with 2 different ones
new coil didn't help
valve clearances
compression 120 psi all cyls, hot or cold
new injectors, but I'm going to try some others that I know are ok

Thanks for yor help! I'm about out of ideas except maybe the CO adjust.

posted by 66.169.95...

• blow-by, but compression ok, JohnT , Thu, 30 Dec 2004 07:28:03
  • It should die @ idle w/ filler cap removed --, jimmy, Sat, 1 Jan 2005 20:33:45
    • Na or turbo ? n/m, BobD, Mon, 3 Jan 2005 19:29:56
      • Re: Na or turbo ? n/m, JohnT , Tue, 4 Jan 2005 15:22:16
        • Check condition of compensating resistor, John Blas, Tue, 4 Jan 2005 18:08:42
          • Re: Check condition of compensating resistor, JohnT , Tue, 4 Jan 2005 18:28:20
            • Re: Check condition of compensating resistor, John Blas, Sat, 8 Jan 2005 15:20:56
              • Re: Check condition of compensating resistor, JohnT , Tue, 11 Jan 2005 04:36:12 <-- Viewing This Message
                • Hmm...., John Blas, Tue, 11 Jan 2005 18:02:39
                  • Re: Hmm...., JohnT , Wed, 12 Jan 2005 17:34:19
                    • It was the injectors!, JohnT , Mon, 17 Jan 2005 20:03:39
    • Re: It should die @ idle w/ filler cap removed --, JohnT , Sun, 2 Jan 2005 09:04:18
      • Re: It should die @ idle w/ filler cap removed --, John Blas, Sun, 2 Jan 2005 17:44:49

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