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S52 swap OBD1 troubleshoot

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    S52 swap OBD1 troubleshoot

    I have a 88 vert that previously had a m52 in It.

    Just swapped a 98 s52 motor with m50 intake manifold and obd1 harness, I swapped all for obd1 configuration. Car cranks but no fuel or spark...

    -fuel pump works I tested It
    -replaced main relay & fuel pump relay
    -I have voltage going to the relays
    -cps is reading .550
    -ICV has constant voltage when key is off and has a humming sound.
    -Tried swapping to another red label 413 but same symptoms
    Last edited by nikeobeys; 01-14-2021, 05:25 PM.

    #2
    Check voltage coming out of relays with key on/off. White stripes on red is switched power.

    Since no spark and no fuel, suspect CPS signal, bad/wrong relay, no DME power.

    Easy/fast way to test DME is getting power is key on and the ICV will buzz/vibrate.

    Check CPS signal at DME connector, not at the sensor wire end.
    john@m20guru.com
    Links:
    Transaction feedback: Here, here and here. Thanks :D

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      #3
      ICV humming without switched power being activated, makes me think you have something wired incorrectly at the battery distribution block.
      Portland, Oregon
      E28M5 | E30S50 | E30M3

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        #4
        Originally posted by e30austin View Post
        ICV humming without switched power being activated, makes me think you have something wired incorrectly at the battery distribution block.
        Good catch. I missed that in the read. Sounds like there may be a ground/power reversed.
        john@m20guru.com
        Links:
        Transaction feedback: Here, here and here. Thanks :D

        Comment


          #5
          The ground connections I’ve checked so far
          -engine mount to chassis
          -ground from engine harness to battery
          -ground from fuel injectors
          -starter

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