Happy to share my thread with SJS.

Refresh - Right before Xmas, replaced O2 sensor I suspected was cause of poor, loping, low idle/killing when warm and occassional, intermittent, always went out CE light.

Reinstalled O2 twice to ensure I did it right - as confident as I can be that I did good connections, even removed insulating cover to ensure no breaks.

Since then: CE light almost always on - goes out rarely, comes back in 2 - 3 min. Pulled codes - codes point to lean air/fuel mix (but it doesn't act lean - runs great!)or O2 pre-heater.

Car idles at 1500 rpm when cold, 1000 when warm, occasionally dropping to 900 rpm, every once in awhile oscillating between 1000 - 1500 rpm.

Doesn't always slow down when in gear and release gas pedal - seems to want to maintain the speed it's at (2nd, 3rd, low rpms). Again - overall car runs pretty damn good.

AMM passes burn off test. I cleaned/sprayed AIC and throttle body early fall. No vaccuum leaks I can find.

I know I need to do electrical tests on O2 sensor - I don't have a multimeter and don't really know how to do this - I hope to try this soon.

My logic points to something with the O2 sensor, as that is the major variable, but I don't know for sure without testing the voltage.

I was going to keep my mouth shut on this til I got a multi and tested, but I was poking around under the hood tonite, remembered about the oil filler cap supposedly letting unmetered air in, and when there was no change in idle, wondered if that was a clue it was something that had failed and gone into a default or limp home setting, therefore causing the idle RPMs I get plus CE light.

Thanks for listening (so to speak) and for great advice!

SDBWORKS



posted by 24.208....

• Removing oil filler cap - effect on idle, SDBWORKS, Tue, 15 Jan 2002 20:07:56
  • Should be a vacumn, Jonathan, Wed, 16 Jan 2002 09:41:20
  • Have you cleaned throttle body and butterfly and>, BobD, Tue, 15 Jan 2002 22:02:34
  • On 16V engines the oilfiller cap doesn't affect the >>>, Anders, Tue, 15 Jan 2002 21:52:42
  • Re: Removing oil filler cap - effect on idle, Tarky, Tue, 15 Jan 2002 20:34:14
    • Re: Removing oil filler cap - effect on idle, burlyb, Tue, 15 Jan 2002 21:18:37
      • Re: Removing oil filler cap - effect on idle, SDBWORKS, Tue, 15 Jan 2002 22:53:11 <-- Viewing This Message
        • Re: Removing oil filler cap - effect on idle, burlyb, Wed, 16 Jan 2002 10:39:49
      • Re: Removing oil filler cap - effect on idle, SJS, Tue, 15 Jan 2002 21:32:50
        • year? engine? LH system?, burlyb, Tue, 15 Jan 2002 21:53:15

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