From looking at the old plugs, I'd say "lean mixture from time to time", it's not that they were grey/white all over. But emissions tester says "too lean by far": 0.01% CO (normally 0.1 - 0.3%)), 9.6% O2 (normally 7.1% max). The Saab dealer suspected the lambda sensor but that one's been replaced in March and works OK as far as I could measure.

Upon recommendations on this BB (thanx to all who contributed), I

- changed the plugs (NGK BCPR 6ES-11), gapped to 1.0mm
- checked and cleaned all electrical connectors under the hood
- checked all vac hoses/fittings/bushings (the one on the valve cover
needed some PTFE taping but fits firmly now)
- cleaned the throttle
- adjusted the throttle position switch

but did not achieve any significant changes. Funny things is, I do not get a "lean mixture condition" alarm from the Jetronic ECU (actually, it doesn't store any codes at all). The only things I can think of now are

- a weak fuel pressure regulator (jeez, how do I check that?)
- a faulty air mass meter
- a bad Jetronic ECU (aaaargh!)

Comes to mind: I still have a brand-new LH 2.2 AMM from my 87 2.9l turbo... it has the adjusting screw, so maybe it could help me. Can I swap this AMM with the 2.4.1 black plastic thing at all?

Once again, your help is mcuh appreciated.

TIA & cheers,
-fab


posted by 80.108.135...

• cause of a lean mixture on LH injection?, paulmanchester, Wed, 3 Jul 2002 17:02:26
  • same here, 90 2.3l non-turbo with LH 2.4.1, fab, Sat, 6 Jul 2002 06:11:43 <-- Viewing This Message
  • Re: most commonly it is the oxygen sensor shorted to, ed's 89T, Wed, 3 Jul 2002 18:08:04
    • Re: most commonly it is the oxygen sensor shorted to, paulmanchester, Wed, 3 Jul 2002 19:08:21
      • Re: Are you using right temperature spark plugs?, SuoTimo, Thu, 4 Jul 2002 06:32:52
      • Re: Ok let's us take this one at a time, ed's 89 T, Wed, 3 Jul 2002 21:07:45
        • Re: Ok let's us take this one at a time, paulmanchester, Thu, 4 Jul 2002 05:14:29
          • Re: it sounds like the mileage is not so bad. I had a, ed's 89 T, Fri, 5 Jul 2002 01:11:49
            • red apc box - checked now!, paulmanchester, Fri, 5 Jul 2002 06:59:48
            • Re: it sounds like the mileage is not so bad. I had a, paulmanchester, Fri, 5 Jul 2002 06:55:43
          • Re: Ok let's us take this one at a time, ed's 89 T, Fri, 5 Jul 2002 00:52:59
    • Re: most commonly it is the oxygen sensor shorted to, paulmanchester, Wed, 3 Jul 2002 19:08:11
  • Re: cause of a lean mixture on LH injection?, ed's 89T, Wed, 3 Jul 2002 18:04:00

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