How to reset Motronic 153 ECU after injector change?

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  • aventari
    Advanced Member
    • Jun 2012
    • 105

    #1

    How to reset Motronic 153 ECU after injector change?

    I have an 87 325is track car that the PO put some bigger 194cc/min injectors on. The motor is stock except for exhaust/headers and it's always had a bit of a hesitation off idle and when stomping the throttle.

    Tonight I but some cleaned and balanced stock blue top 154 cc/min injectors on and now it has a lot better drivability.

    However my wideband still shows it running rich.

    Do I need to reset the ECU so it can 're-learn' the new injectors? I unplugged the battery for a few minutes after installing the injectors but is there anything else?
  • bastianshaw
    R3VLimited
    • Jan 2007
    • 2210

    #2
    no
    replace the air filter and check your tps

    Comment

    • aventari
      Advanced Member
      • Jun 2012
      • 105

      #3
      Brand new air filter, and how do I check the TPS?

      I plan on retracking the AFM this weekend as well

      Comment

      • bastianshaw
        R3VLimited
        • Jan 2007
        • 2210

        #4
        how rich is it?
        you can search for checking the tps

        Comment

        • EatsHondas
          E30 Addict
          • Sep 2012
          • 404

          #5
          Originally posted by aventari
          Brand new air filter, and how do I check the TPS?

          I plan on retracking the AFM this weekend as well
          "Test the switch by checking for continuity at the connector terminals on the switch. Connect an ohmmeter between terminals 2 and 18. Open the throttle part way by hand. Slowly let the throttle return to its idle stop. There should be continuity (0 ohms) at the terminals when the throttle lever is approximately 0.20 to 0.60 mm (.008 to .024 in.) from its stop. Connect an ohmmeter between terminals 3 and 18. Open the throttle slowly. There should be continuity when the throttle switch is within 10 ± 2° of the full-throttle position." - Bentley
          1989 325i Lachssilber Sedan
          5-Speed Swapped
          M30B35 Swapped
          MegaSquirt MS3X

          1987 325i Lachssilber Sedan
          260k OEM Automatic Daily Baby

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