Could AFM create rough idle stall?

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  • alB5
    Mod Crazy
    • Mar 2011
    • 785
    #1

    Could AFM create rough idle stall?

    Hi, I've been trying to diagnose my m42 for about 2 weeks now and every time I turn it on it dies almost immediately after leaving me only with a CEL. I did this check (pushing gas pedal 5 times) and it gave me 1215 which is a Mass Air flow sensor fault. Could this be my idle fault? I double checked all vacuum lines around the intake/valve cover so I'm sure it's somewhere else. How do I go about fixing the AFM?


    Should I try this method?


    Or should I just buy a new AFM and not mess with it?

    Please help me out fellas.


    1991 318is -> 2004 R32 -> 2002 Jetta TDI -> 2014 FiST

    No E30 Club
    Tags: None
    • Dj Buttchug
      R3V OG
      • Jun 2010
      • 7633
      #2
      Afm usually gives issues under load at different throttle speeds. could give idle issues tho...

      Turbo M42 Build Thread :Here
      Ig:ryno_pzk
      I like the tuna here.
      Originally posted by lambo
      Buttchug. The official poster child of r3v.

        Comment

        • alB5
          Mod Crazy
          • Mar 2011
          • 785
          #3
          Well, I have misfires when revving also. Although the little flap inside the meter moves freely, a CEL indicating the meter is faulty has to be the issue at hand right? Could any E30 AFM work with my DME? I was thinking about going by the salvage and picking one up to test.


          1991 318is -> 2004 R32 -> 2002 Jetta TDI -> 2014 FiST

          No E30 Club

            Comment

            • bmwguy325is
              E30 Fanatic
              • May 2011
              • 1262
              #4
              Your car should start and run with no AFM on it at all. It just wont rev or run very well. Sounds like you have other issues. The missfires could be related to the AFM though. As for it not idling ya its sumthn eles.
              sigpic"If one does not fail at times, then one has not challenged himself." -Ferdinand Porsche
              The ugly car: http://www.r3vlimited.com/board/showthread.php?t=209713

                Comment

                • alB5
                  Mod Crazy
                  • Mar 2011
                  • 785
                  #5
                  Yeah, you got it the car runs very badly when the AFM is disconnected but at least it runs. I've checked and checked again for vacuum leaks, god I hope it's this stupid AFM that's my problem.


                  1991 318is -> 2004 R32 -> 2002 Jetta TDI -> 2014 FiST

                  No E30 Club

                    Comment

                    • carfantiti
                      Banned
                      • Mar 2011
                      • 790
                      #6
                      sounds like a manifold leak or vacume.
                      clean the idle control valve with w-d 40.check the throttle position sensor if working prop.you should only have to adjust a afm if your car is modified like my stroker was.

                        Comment

                        • alB5
                          Mod Crazy
                          • Mar 2011
                          • 785
                          #7
                          but a CEL that states 1215 Mass Air flow meter can't be the problem?

                          1215 Mass Air Flow Sensor Fault The mass air flow sensor measures the amount of air that is currently being drawn into the engine. A big hole in one of your fuel injection intake boots may cause the car to stall and generate this code.

                          - off pelican


                          1991 318is -> 2004 R32 -> 2002 Jetta TDI -> 2014 FiST

                          No E30 Club

                            Comment

                            • alB5
                              Mod Crazy
                              • Mar 2011
                              • 785
                              #8
                              Ok so i've double checked the icv itself and found that the side that faces up doesn't open much. Can't seem to open it with wd40 or anything. Is the arrow on the it supposed to be facing toward the engine bay or away? In other words is the arrow supposed to be going towards the intake manifold or the intake boot?


                              1991 318is -> 2004 R32 -> 2002 Jetta TDI -> 2014 FiST

                              No E30 Club

                                Comment

                                • Vtec?lol
                                  No R3VLimiter
                                  • Dec 2009
                                  • 3278
                                  #9
                                  Does your car have the recall work done on the AFM?
                                  There should be an inline resistor pack thingy in the wire connection to the afm.

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