plugs not firing

Discussion in 'Softail Models' started by fatboy se, Sep 14, 2010.

  1. fatboy se

    fatboy se Member

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    :small3d023:Had a 98 Heritage come into the shop with a non cranking problem. It has a new coil and a compua-fire module on it. The red light was not lighting up at times on the module, so in replaced it.Checked out the coil,the resistance was 3.3 ohms post to post and 11,500 ohms from plug to plug outlet. Any ideas?
     
  2. Hoople

    Hoople Account Removed

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    No cranking? or Not starting. Don't see how coils and spark would inhibit the starter.
     
  3. fatboy se

    fatboy se Member

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    no fire to plugs means it is turning over but no start
     
  4. R. Lewis

    R. Lewis Senior Member Retired Moderators

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    Are the plug wires themselves good? Does it show any codes? Checked the fuses / relays?
     
  5. Hoople

    Hoople Account Removed

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    What is the part number of the Compu-Fire ignition module you installed.
     
  6. fatboy se

    fatboy se Member

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    yes, and there is 12 volts on the postive side of the coil too

    not at the shop now don't remember part # but is is the dual fire

    installed a power house the last time
     
    Last edited by a moderator: Sep 14, 2010
  7. Hoople

    Hoople Account Removed

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    95-99 Big Twins with "Deutsch" con.(exc. FI & Twin Cam 88) ? Single coil dual fire?

    Model 25010 ring a bell?
     
  8. fatboy se

    fatboy se Member

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    The compu-fire was installed by another shop on 6/30/10. quit running last week and owner installed new coil. Then was towed to my shop. Contacted tech dept. at compu-fire and explaned the problem with the red light on the unit not lighting up at times and at times not flashing when spinning over so I sent it back for repair and installed one from Power House

    as far as the part # that was two days ago and we are very busy with 10 to 15 jobs coming in daily, mostly transmission repair on autos

    but i do think that was the correct part #
     
    Last edited by a moderator: Sep 14, 2010
  9. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    Have you opened up the cap on the nose cone and looked behind the module to make sure the interrupter mechanism has not come loose?

    TQ
     
  10. Jack Klarich

    Jack Klarich Expert Member

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    If the compu fire is anything like the rest of the after market ignitions I have seen The diagnostic lights on the unit should stay on telling you the trigger mechanism is working. Have also seen bad grounds cook these systems JMO