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Thread: Ram Jet 502 MEFI 4 Crank Position Sensor?

  1. #16
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    These numbers are good for 96 also.

    The reluctor wheel used in 96-00 l29 is p/n 12561074.

    If these match and the sensor is good, only possible reason could be the space between wheel and sensor.

  2. #17
    Super Moderator dave w's Avatar
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    Quote Originally Posted by kur4o View Post
    These numbers are good for 96 also.

    The reluctor wheel used in 96-00 l29 is p/n 12561074.

    If these match and the sensor is good, only possible reason could be the space between wheel and sensor.
    I measured almost 0.060" of gap between the CKP and trigger wheel. I'm thinking a gap of about 0.015" is where I need to be.

    dave w

  3. #18
    Super Moderator dave w's Avatar
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    Quote Originally Posted by dave w View Post
    I measured almost 0.060" of gap between the CKP and trigger wheel. I'm thinking a gap of about 0.015" is where I need to be.

    dave w
    Correction, the gap is about 0.036".

  4. #19
    Super Moderator dave w's Avatar
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    Does anyone know what the output voltage of the Vortec 454 crank position sensor is supposed to be? I have two used crank position sensors (not sure what make / model / year they are from) and the output voltage is 5.25 volts DC. I just purchased a new Standard Motor Products (PC123T) Vortec 454 crank position sensor and it has an output voltage of 12 volts DC. When the trigger wheel passes the crank position sensors I have the output voltage goes to 0 (ZERO) volts DC.

  5. #20
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    I did some research and the 454 sensor output a frequency to pcm, and for diagnostics some duty cycle in hz is measured.
    It gets some B+ voltage so it is possible the output be around 12v.
    For comparison Ls crank sensor output 4-6v signal.

    Could a 96-97 lt1 crank sensor be used in the ramjet engine.

  6. #21
    Super Moderator dave w's Avatar
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    Quote Originally Posted by kur4o View Post
    I did some research and the 454 sensor output a frequency to pcm, and for diagnostics some duty cycle in hz is measured.
    It gets some B+ voltage so it is possible the output be around 12v.
    For comparison Ls crank sensor output 4-6v signal.

    Could a 96-97 lt1 crank sensor be used in the ramjet engine.
    The 502 started today, after installing the Standard Motor Products PC123T crank position sensor. More work to follow.

    dave w

  7. #22
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    Glad she fired, here is the actual marine part number for future reference

    $94
    8M0011986 SENSOR ASSEMBLY, Cam Position


    These CKP sensors are very sensitive to install, I have found that if I install the sensor then use the screw to draw the sensor in they don't work, but if I insert the sensor, then give it a push to ensure its in there flush, THEN tighten the screw it'll start.

    peace
    Hog

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