check engine light intermittent

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  • cheffy30
    E30 Enthusiast
    • Sep 2016
    • 1159
    #1

    check engine light intermittent

    It's come on...
    It's goes off... only 3 times now in the last week of 22 yeaes daily driving...throttle loses air intake it seems... once it stabilizes I'll gun it to 6k a couple times... it goes off.
    all aside the m20 is in very good shape. No oil leaks. Vacuum is tight. recent 5 speed swap. afm is new refurb... last year.
    can I guess maybe the o2 sensor is the case... no stomp test done. not necessary yet... I think...

    What's the average life of the o2 sensor?


    sent fresh from hell using tapatalk

    ~~~~~~~~~~~~~~~~~
    '90 325i sedan daily driven
    '85 325e coupe also a daily
    Tags: None
    • e30austin
      I waste 90% of my day here and all I got was this stupid title
      • Sep 2010
      • 15382
      #2
      a CEL that turns itself off, especially when performing the "italian tuneup", is usually indicative of a fuel mixture issue. start with the oxygen sensor.


        Comment

        • twright
          Mod Crazy
          • Sep 2008
          • 707
          #3
          I had a 1987 325is that did that. On mine, it was a vacuum leak caused by the o'ring that goes on the bottom of the vent tube that goes from the intake manifold to the block.

            Comment

            • MrBurgundy
              R3V Elite
              • Mar 2012
              • 5330
              #4
              To echo what austin said in addition to the oxygen sensor, I would smoke test the intake, especially if you're getting it on at idle and it will turn off with a throttle 'blip'

              I would say an oxy sensor is reliable for about 100k
              Current Collection: 1990 325is // 1987 325i Vert // 2003 525i 5spd // 1985 380SL // 1992 Ranger 5spd // 2005 Avalanche // 2024 Honda Grom SP // 2024 Yamaha XSR700 // 2024 Jeep Gladiator Rubicon

                Comment

                • It's Soda Not Pop
                  E30 Modder
                  • Jan 2022
                  • 861
                  #5
                  Just out of curiosity do you have a MAF conversion? My car does something similar to this every once in awhile. It throws a 1215 code (afm/maf) and if I blip the throttle it goes away. I have a SSSquid MAF.

                  88' Seta 2.7i Zinno

                  https://www.r3vlimited.com/board/for...430-my-88-seta

                    Comment

                    • Northern
                      R3V Elite
                      • Nov 2010
                      • 5092
                      #6
                      Mine would do this, stomp test showed a "Lambda Control" code, which can mean a lot of things.
                      O2 sensor, AFM, Vacuum leaks are all possibilities IIRC.
                      Originally posted by priapism
                      My girl don't know shit, but she bakes a mean cupcake.
                      Originally posted by shameson
                      Usually it's best not to know how much money you have into your e30

                        Comment

                        • cheffy30
                          E30 Enthusiast
                          • Sep 2016
                          • 1159
                          #7
                          No MAF conversion. She is OEM.
                          Will attempt another smoke test but i know she's tight.
                          I can't find an O2 replacement in my service records anywhere...
                          If that's the case it's well over 100k...
                          New O2 sensor goes on today...

                          Thanks guys.


                          sent fresh from hell using tapatalk

                          ~~~~~~~~~~~~~~~~~
                          '90 325i sedan daily driven
                          '85 325e coupe also a daily

                            Comment

                            • cheffy30
                              E30 Enthusiast
                              • Sep 2016
                              • 1159
                              #8
                              she was ready for a new one...

                              sent fresh from hell using tapatalk

                              ~~~~~~~~~~~~~~~~~
                              '90 325i sedan daily driven
                              '85 325e coupe also a daily

                                Comment

                                • moatilliatta
                                  R3V OG
                                  • Feb 2005
                                  • 6121
                                  #9
                                  I had 02 relay power issues onetime. Ran fresh wire and was ok.

                                  I was up above it, Now I'm down in it ~ Entropy - A Build thread.
                                  @Zakspeed_US

                                    Comment

                                    • cheffy30
                                      E30 Enthusiast
                                      • Sep 2016
                                      • 1159
                                      #10
                                      after replacing sensor, fucking CEL came on again. settled out after a rest and test and a couple hefty throttle pulls...

                                      can someone review the stomp test procedures and when do I perform it?

                                      sent fresh from hell using tapatalk

                                      ~~~~~~~~~~~~~~~~~
                                      '90 325i sedan daily driven
                                      '85 325e coupe also a daily

                                        Comment

                                        • roguetoaster
                                          R3V OG
                                          • Jan 2012
                                          • 7773
                                          #11
                                          Stomp test - key to on, within 10s of key turn, fully depress throttle pedal 5 times, try to pause at WOT momentarily, wait for flashes.

                                          If not working from inside you can do the same by manually actuating the throttle in the engine bay. If it works, adjust your throttle cable.

                                          If neither work at all you've found that your TPS or associated wiring is faulty. Or you know, the DME could be boned.

                                          Also, IIRC pre 88 cars will not support the test without a DME swap or only certain DMEs/configs support it at all.

                                            Comment

                                            • It's Soda Not Pop
                                              E30 Modder
                                              • Jan 2022
                                              • 861
                                              #12
                                              https://www.pelicanparts.com/BMW/tec...de_Reading.htm

                                              88' Seta 2.7i Zinno

                                              https://www.r3vlimited.com/board/for...430-my-88-seta

                                                Comment

                                                • cheffy30
                                                  E30 Enthusiast
                                                  • Sep 2016
                                                  • 1159
                                                  #13
                                                  great article... Thanks!
                                                  I'll be digging...

                                                  sent fresh from hell using tapatalk

                                                  ~~~~~~~~~~~~~~~~~
                                                  '90 325i sedan daily driven
                                                  '85 325e coupe also a daily

                                                    Comment

                                                    • It's Soda Not Pop
                                                      E30 Modder
                                                      • Jan 2022
                                                      • 861
                                                      #14
                                                      Originally posted by cheffy30
                                                      great article... Thanks!
                                                      I'll be digging...

                                                      sent fresh from hell using tapatalk
                                                      No worries. Let us know something

                                                      88' Seta 2.7i Zinno

                                                      https://www.r3vlimited.com/board/for...430-my-88-seta

                                                        Comment

                                                        • emmausa0106
                                                          Banned
                                                          • Sep 2023
                                                          • 1
                                                          #15
                                                          Great post. I have learned many very useful experiences through the information you share. mapquest directions​

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