CEL comes on at idle then goes off once on throttle

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  • Brezzi
    E30 Mastermind
    • Jan 2010
    • 1630
    #1

    CEL comes on at idle then goes off once on throttle

    My check engine light comes on while my car is idling, it sounds fine it just comes on sometimes if the car has been running for awhile and I'm stopped for more than 90 seconds. Also as soon as I touch the throttle the light goes off. I just swapped the trans. in my car and I'm guessing theres a really small exhaust leak or something like that? Haven't poked around too much yet I'm just looking for some advice on plausible culprits on an m20?

    Thanks
    Tags: None
    • hamilton325i
      Member
      • Sep 2011
      • 83
      #2
      Have you checked if any codes are stored in the ECU?

        Comment

        • RoadWarrior
          Member
          • Jan 2011
          • 77
          #3
          tps?

            Comment

            • TS87325IS
              E30 Modder
              • Sep 2006
              • 821
              #4
              Sounds like a vacum leak. Mine did that and it ended up being the intake boot.
              sigpic
              mods: just meat and potatoes under the hood and wheaties on fire out back ;)

                Comment

                • jlevie
                  R3V OG
                  • Nov 2006
                  • 13530
                  #5
                  Sounds to like it could be intake leaks, possibly aggravated by an aged O2 sensor. A smoke test will tell if (and where) there are leaks. An O2 sensor that has 100k needs to be replaced.
                  The car makes it possible, but the driver makes it happen.
                  Jim Levie, Huntsville, AL

                    Comment

                    • MaksV
                      E30 Enthusiast
                      • Oct 2010
                      • 1042
                      #6
                      had this on my m20. ended up being a wire that had sort of broken in the harness. I suggest giggleing the harness while car runs to see if it dissappears.
                      CHEAP REBUILT INJECTORS




                      Need Quality Brakes? BimmerBrakes has it!
                      For anything Else go with BluntTech!

                        Comment

                        • Brezzi
                          E30 Mastermind
                          • Jan 2010
                          • 1630
                          #7
                          poked around and found a crack in the intake boot gunna try than first. Thanks guys.:up:

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