What did I miss??

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  • Bmjpv
    E30 Addict
    • Mar 2007
    • 561
    #1

    What did I miss??

    I did the S52 build up for my 88' 325is and it fired right off! the windows work too! Thanks to all of you that had layed out and shared this area of the swap with others! My problem is dieing coming up to stops ,Idle after startup (cold ) is good, tps checks good, cis motor shows good. Speed,abs and cruise all work. Driving with scanner hooked up shows speed sensor with very little movement at about 28km.The ecu thinks I'm always moving. My thoughs are the ecu is not getting a readable signal that I'm coming to stop causing no signal to tps/cis motor? If I brake and hold in gear down to 1500rpm engine won't die. I'd love to hear from someone smarter than me with some ideas about as what's going on?? WHAT DID I MISS?? thanks joe
    Last edited by Bmjpv; 05-14-2007, 01:44 PM.
    Tags: None
    • Jason89i
      E30 Modder
      • Sep 2004
      • 875
      #2
      Originally posted by Bmjpv
      I Driving with scanner hooked up shows speed sensor with very little movement at about 28km.The ecu thinks I'm always moving.
      double check your wiring regarding the speed signal.

      the ecu on a 506/413 ecu will UP the idle 100rpm if it thinks the car is rolling.

      simple test. stop on a hill. let the car idle. release brake, let the car roll down hill in neutral. ecu should increase idle about 100rpm if the speed signal is present.

      cheers, jason

        Comment

        • PiercedE30
          R3V Elite
          • Apr 2005
          • 4220
          #3
          +1 on the speed sensor
          My 2.9L Build!

          Originally posted by Ernest Hemingway
          There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

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            • static
              E30 Addict
              • Oct 2005
              • 501
              #4
              just a theory, but could it be the neutral signal from tranny not connected? (two wires that go through the rubber shifter boot)

                Comment

                • Lobstrosity
                  Advanced Member
                  • Aug 2004
                  • 116
                  #5
                  Originally posted by static
                  just a theory, but could it be the neutral signal from tranny not connected? (two wires that go through the rubber shifter boot)
                  That's the reverse light switch, sir.

                    Comment

                    • Jason89i
                      E30 Modder
                      • Sep 2004
                      • 875
                      #6
                      Originally posted by static
                      just a theory, but could it be the neutral signal from tranny not connected? (two wires that go through the rubber shifter boot)
                      no neutral or high gear switch on the US spec motors.....thats only on the euro motors. cheers, jason

                        Comment

                        • static
                          E30 Addict
                          • Oct 2005
                          • 501
                          #7
                          Originally posted by Lobstrosity
                          That's the reverse light switch, sir.
                          haha, you're right. brainfart!

                            Comment

                            • Bmjpv
                              E30 Addict
                              • Mar 2007
                              • 561
                              #8
                              Update,This weekend I'll put the time in but I've noticed that If the engine dies coming to stops the tach will stay/sticks at the rpm it died at.Does not die at speed ,only coming to stops under normal conditions! Tach freezing/holding, restarts normal,tach returns correct operation . Where to look first? WHAT DID I MISS?? thanks joe

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