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  • #1

    possible AFR issues

    Recently my 335 has been dumping itself into mode 4 (stock with logging active) every now and again during a spirited drive. I just did my spark plugs and am no longer missfiring, so that leads me to believe the AFR is out.

    Can quite cold air skew the AFR on a turbo car? I know that it should be more compressed going into the turbo, but the car should be mitigating it's own boost level and compensating for that should it not? I'm not throwing boost target codes or any codes for that matter, so it leads me to believe it may solely be the cold air.

    Any input would be awesome!
    Tags: None
  • #2
    Re: possible AFR issues

    Can you log the AFR?

    The ECU should have no problem compensating for the colder air.

    Pat

    His
    1989 Porsche Carrera 4 // 5 Speed // Guards Red

    Hers
    1987 VW Cabriolet // 20VT // O2J // Recaros // Porsche Slate Grey // Ronal Turbos // FK Coilovers

    2005 Porsche Cayenne S

    Theirs
    1977 VW Type 2 Westfalia

    Gone
    2004 Audi A4 1.8T // quattro // 6 Speed // Brilliant Red
    Fully built 1.8T || AEB || Motoza tuned || ID1000 || S4 MAF || GT3076R

    Comment

    • #3
      Re: possible AFR issues

      MAP and MAF and AIT sensors on your car? If so no problem what so ever.

      Comment

      • #4
        Re: possible AFR issues

        Originally posted by MechEngg View Post
        MAP and MAF and AIT sensors on your car? If so no problem what so ever.
        Sure does have them.

        I can try to log them, but it's tricky since this idiot ran the USB under the hood... hard to use my laptop under there will driving :(

        Might toss JB into learn as you drive mode and see from there.

        I'm hoping for a warm day to see if I can rule some things out. Injectors are fairly new so I doubt it's them. Plugs are under 1000km old, and coils were swapped and are still reading no misfires.
        Last edited by ToXicXxX; 03-04-2014, 08:23 PM.

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        • #5
          Re: possible AFR issues

          Turn off the jb4, and see if it makes any difference
          ~~TODD~~
          '12 x5 35d fully deleted (DUDMD Stg2)

          Comment

          • #6
            Re: possible AFR issues

            Originally posted by T-Dubbs View Post
            Turn off the jb4, and see if it makes any difference
            I can't tell If I go over AFR without haha

            Comment

            • #7
              Re: possible AFR issues

              You can get a USB extension cord..

              Pat

              His
              1989 Porsche Carrera 4 // 5 Speed // Guards Red

              Hers
              1987 VW Cabriolet // 20VT // O2J // Recaros // Porsche Slate Grey // Ronal Turbos // FK Coilovers

              2005 Porsche Cayenne S

              Theirs
              1977 VW Type 2 Westfalia

              Gone
              2004 Audi A4 1.8T // quattro // 6 Speed // Brilliant Red
              Fully built 1.8T || AEB || Motoza tuned || ID1000 || S4 MAF || GT3076R

              Comment

              • #8
                Re: possible AFR issues

                Originally posted by onceover View Post
                You can get a USB extension cord..
                Aha out my hood, into my window... I will try.

                Comment

                • #9
                  Re: possible AFR issues

                  You could route an USB cable through the firewall grommet and into the cabin.
                  I may appear to be nice, but don't be fooled, I probably don't like you

                  Comment

                  • #10
                    Re: possible AFR issues

                    Originally posted by Mantis View Post
                    You could route an USB cable through the firewall grommet and into the cabin.
                    This. You might as well make it a permanent solution

                    Pat

                    His
                    1989 Porsche Carrera 4 // 5 Speed // Guards Red

                    Hers
                    1987 VW Cabriolet // 20VT // O2J // Recaros // Porsche Slate Grey // Ronal Turbos // FK Coilovers

                    2005 Porsche Cayenne S

                    Theirs
                    1977 VW Type 2 Westfalia

                    Gone
                    2004 Audi A4 1.8T // quattro // 6 Speed // Brilliant Red
                    Fully built 1.8T || AEB || Motoza tuned || ID1000 || S4 MAF || GT3076R

                    Comment

                    • #11
                      Re: possible AFR issues

                      Only issue I have with that is its a perm modification. The whole reason I went JB I land not a flash tune is so I can restore the car 100% stock for sale. I don't want to be putting holes an such if I don't need to.
                      Last edited by ToXicXxX; 03-05-2014, 01:24 PM.

                      Comment

                      • #12
                        Re: possible AFR issues

                        You can typically find grommets to slip your cables through. There are typically some main harnesses that run through the firewall with zip ties that close off the grommets that you can snip off, feed the wires through, then re-zip tie and nobody will ever know

                        Comment

                        • #13
                          Re: possible AFR issues

                          New OBD2 adapter arrived, so I cal log AFR now.

                          Heres an AFR log. 15ish for idle/normal driving... Then a crazy spike on hard acceleration.



                          Also purchased BMWhat for my phone, it's a solid app for BMW owners. Lot's of shadow codes that I cleared, nothing new coming up
                          Last edited by ToXicXxX; 03-20-2014, 05:16 PM.

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