Hesitations at acceleration

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  • Jim Lepage
    E30 Enthusiast
    • Jul 2008
    • 1138
    #1

    Hesitations at acceleration

    My M50TU has some hesitations (flat spots) at acceleration. It's happening when I start from idle to redline. If I start accelerating at high RPM it's not doing it.

    What could do that:

    -bad vanos unit ?
    -bad O2 sensor ?
    -bad crank sensor ?
    -bad cam sensor ?
    E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50
    Tags: None
    • Charlie
      kid tested, administrator approved
      • Oct 2003
      • 6686
      #2
      MAF sensor. They tend to take a shit.

      -Charlie
      Swing wild, brake later, don't apologize.
      '89 324d, '76 02, '98 318ti, '03 Z4, '07 MCS, '07 F800s - Bonafide BMW elitist prick.
      FYYFF

        Comment

        • omar85
          Grease Monkey
          • Aug 2008
          • 331
          #3
          Originally posted by Charlie
          MAF sensor. They tend to take a shit.

          -Charlie

          what he said. read the codes if you can.

          also check simple things like your spark plugs.

            Comment

            • Jim Lepage
              E30 Enthusiast
              • Jul 2008
              • 1138
              #4
              Originally posted by omar85
              what he said. read the codes if you can.

              also check simple things like your spark plugs.
              Spark plugs and fuel filter are new. I'll check for the codes.

              EDIT: I'll try to clean the MAF ( http://forum.e46fanatics.com/showthread.php?t=335561 ) and search for cracked hoses (vacuum leak).
              Last edited by Jim Lepage; 09-13-2009, 04:43 PM.
              E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

                Comment

                • Jim Lepage
                  E30 Enthusiast
                  • Jul 2008
                  • 1138
                  #5
                  I cleaned the MAF with caution with contact cleaner and it's now running very rough (vibrations) at idle and from idle to 2000 rpm. I don't see a big difference if the MAF is plugged or not and it's also smelling very bad.

                  Do I need a new MAF ?
                  Last edited by Jim Lepage; 09-16-2009, 06:20 PM.
                  E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

                    Comment

                    • rThor432
                      No R3VLimiter
                      • Feb 2007
                      • 3907
                      #6
                      ^^If there isnt a big difference between plugged in and unplugged, then it is very likely that your MAF is bad.

                        Comment

                        • e30s52
                          R3V Elite
                          • Oct 2007
                          • 5235
                          #7
                          Get a new one or test with a know good one.

                          www.gutenparts.com
                          One stop shopping for NEW, USED and EURO PARTS!

                            Comment

                            • Jim Lepage
                              E30 Enthusiast
                              • Jul 2008
                              • 1138
                              #8
                              Ok thanks for helping.
                              E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

                                Comment

                                • e30s52
                                  R3V Elite
                                  • Oct 2007
                                  • 5235
                                  #9
                                  You can try back probing it to to see if the voltage is in specs.

                                  www.gutenparts.com
                                  One stop shopping for NEW, USED and EURO PARTS!

                                    Comment

                                    • BimmerTim
                                      Mod Crazy
                                      • Oct 2007
                                      • 613
                                      #10
                                      If you need a MAF, I have a known working one that I could ship to you.

                                      If you are interested, PM me.

                                      1988 Bronzitbeige Metallic 325e 2-door S50 turbo (OO=( )=OO)
                                      2008 VW Rabbit
                                      1991 Audi 200 20vtq Wagon

                                        Comment

                                        • Jim Lepage
                                          E30 Enthusiast
                                          • Jul 2008
                                          • 1138
                                          #11
                                          Originally posted by BimmerTim
                                          If you need a MAF, I have a known working one that I could ship to you.

                                          If you are interested, PM me.
                                          PM'ed...
                                          E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

                                            Comment

                                            • Jim Lepage
                                              E30 Enthusiast
                                              • Jul 2008
                                              • 1138
                                              #12
                                              I'm at work and just received a MAF I found in a local scrapyard. My concern is the guy sent me a M52 MAF (Siemens 1 703 275). Will it work on my M50 ?
                                              E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

                                                Comment

                                                • e30s52
                                                  R3V Elite
                                                  • Oct 2007
                                                  • 5235
                                                  #13
                                                  Originally posted by Jim Lepage
                                                  I'm at work and just received a MAF I found in a local scrapyard. My concern is the guy sent me a M52 MAF (Siemens 1 703 275). Will it work on my M50 ?
                                                  The m52 maf will be obd2 I think. I dont think it will work. Try realoem and compare part numbers.

                                                  www.gutenparts.com
                                                  One stop shopping for NEW, USED and EURO PARTS!

                                                    Comment

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