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  1. #1

    2001 GTX 787 RFI no spark

    Long story but the last part is that after a compression test (150, 155) and resistance testing all sensors (TPS, CPS, ATS, WTS, APS) I hook everything back up to find NO SPARK. 5 Vdc at ignition coil when I depress start button with no lanyard attached. Primary resistance check of coil shows resistance readings within specifications. I double checked MPEM connections, I get 2 beeps on lanyard install, engine cranks fine, battery is at about 12.5 Vdc, I have plenty of fuel going into cylinders and have verified no spark at plugs oh and I tried new plugs since I had a set.

    5A fuse in MPEM is good, all fuses in in battery box are good

    Also checked battery ground, coil ground and mpem ground...all good.

    I have tried a second coil with the same results

    Any thoughts?


  2. #2
    You do realize that the troubleshooting manual suggests checking for fault code(s) and that - "No Spark" is a defective MPEM

  3. #3
    I believe that the CPS tells the MPEM when to trigger the coil to spark, correct? If that is true there should be a way to check that the CPS is doing what it should and there should also be a wayt o see if the MPEM is sending the correct signal to the coil. If both of those test check OK the only thing remaining would be the MPEM. I would like to find out what is the best way to accomplish those checks before I buy a MPEM as a diagnostic measure. Especially that the whole testing that was accomplished in the original post was done to diagnose a problem of hard starting on the water, and prior to that testing it would fire up every time on the trailer.

  4. #4
    To test the CPS unplug the #4 AMP connector from the mpem and test resistance between pins 7 and 14 the resistance should read 774-946 ohms..

    The only tests for the coil is a resistance test on the primary winding .3 to .6 ohms and 6 volts on the red wire to ground

  5. #5
    Quote Originally Posted by KYHI View Post
    To test the CPS unplug the #4 AMP connector from the mpem and test resistance between pins 7 and 14 the resistance should read 774-946 ohms..

    The only tests for the coil is a resistance test on the primary winding .3 to .6 ohms and 6 volts on the red wire to ground
    Thanks for that information, however I have already performed those checks (see original post). In fact I have resolved my issue and it was caused as a direct result of performing those tests.

    It turns out that when I inserted my test leads into the pin holes in the MPEM plug the test lead probes were slightly larger than the pin on the MPEM and they expanded the socket just enough to not allow proper connection be tween the socket an d the pin. I though that I had addressed this by using a small screw driver to "squeeze" the end of the socket into a smaller diameter but it turns out that I had to take the face of the plug off, exposing all of the sockets and then push the little tabs of the socket (that are designed to "grip" the pin) inward to tighten the contact to the pin. I used the shank end of a #55 drill bit (.052" dia) to test the "grip". After checking all of the sockets and putting the plug back together I have spark back!

    Kudos go out to the guys at CanDooPro for suggesting the procedure for checking the sockets and their grip!

  6. #6
    Self inflicted Issue - Hard to give advise or offer much help on those..

    Glad it was an easy fix - although a Stumper to figure out..

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