Check engine light on at idle

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  • Coupenut
    Noobie
    • Oct 2014
    • 7
    #1

    Check engine light on at idle

    I'm hoping for some advice from the collective wisdom of the group rearding an issue that I'm having with my car.
    The car is an 88 325iX, 175K miles, manual transmission.
    When the car idles for example at a traffic light after a few moments the check engine light comes on. If I press the accelerator and raise the engine RPMs above approximately 1500 the light goes off. This doesn't happen when the car is moving and only after it reaches operating temperature.
    Does anyone have any thoughts about what might be causing this?

    Thanks,

    James
    Tags: None
    • jlevie
      R3V OG
      • Nov 2006
      • 13530
      #2
      Intake leaks and/or an aged O2 sensor (replacement interval for the sensor is 100k). A smoke test will find any intake leaks.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

        Comment

        • e30topdown
          Member
          • Apr 2010
          • 94
          #3
          ^+1
          What Jim said. If the O2 sensor hasn't been replaced in a long while, you might want to do that anyway. I usually replace at 60k miles.
          sigpic

          92 325iC Diamantschwarz factory M-Technic appearance
          99 M Roadster Dakar Yellow II
          97 318ti Active Bostongrun DD
          01 Z3 3.0i Coupe Black Sapphire
          93 325iC Schwarz II. Sold, but not forgotten.

            Comment

            • mazzo
              Wrencher
              • Jul 2014
              • 264
              #4
              Any stomp test code?
              Current:
              '88 325ic Silver 5sp
              '17 Subaru Outback 3.6R

              Past:
              '14 Rav4 EV (with tons of torque!)
              '06 325i Black 5sp
              '02 S4 Avant Black 6sp
              '00 Boxster Silver 5sp
              '98 New Bettle Yellow 5sp

                Comment

                • cavpilot
                  Advanced Member
                  • Dec 2013
                  • 112
                  #5
                  Definately an intake vacuum line. Be sure to check the vacuum line on the underside of the throttle body. That one gave be the exact same indications.

                    Comment

                    • jayamasaki79
                      Grease Monkey
                      • Oct 2014
                      • 342
                      #6
                      what is the BOSCH O2 sensor part # ?

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