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no spark

Discussion in 'The Hokey Ass Message Board' started by S.Dave, Jan 22, 2014.

  1. S.Dave
    Joined: Mar 15, 2011
    Posts: 25

    S.Dave
    Member

    I have a 307 engine installed in one of my cars. It ran fine for a while with a new HEI after market distributor. Now I have no spark. First I checked the spark at several plug wires. Then checked power to the distributor which was good. Had the control module tested, it's good. Tested primary and secondary readings at the coil - all good. I even bent the spring on the rotor so it would be sure to contact the carbon tip on the cap. Retested spark at the plugs - nothing. Running out of ideas. Have new distributor, wires and plugs. HELP!!!
     
  2. Pull the rotor and look for burn-through.
    check the spring between the button and coil.
    Check the wires on the pickup coil for internal breakage (pull test)
     
  3. saltflats
    Joined: Aug 14, 2007
    Posts: 12,592

    saltflats
    Member
    from Missouri

    If its a HEI with the coil in cap take the cover off the coil have someone crank it over and watch for spark jumping over to one of the screws that hold the coil in. Could be that the coil has a leak in it.
     
  4. S.Dave
    Joined: Mar 15, 2011
    Posts: 25

    S.Dave
    Member

    Thanks for the quick reply. Good advice,will give it a shot. Thanks, Dave.
     

  5. S.Dave
    Joined: Mar 15, 2011
    Posts: 25

    S.Dave
    Member

    Thanks, SF. Will give a try .
     
  6. jack_pine
    Joined: Jan 20, 2007
    Posts: 353

    jack_pine
    Member
    from Motor City

    I used a trick to pulse the (inside the distributor, not external) HEI module - simulating a pickup coil signal: remove pickup coil leads from where they connect to module's 2 pins/blades. With 12v to coil and other primary connections to coil intact, quickly touch the module's exposed pins where you disconnected pickup coil from. Do it several times quickly while checking for spark at the coil button.

    This checks for bad pickup coil by using your body's internal voltage to simulate pickup coil signal. Also inspect pickup coil leads. If the distributor has vacuum advance, years of rotating the pickup coil can fatigue the leads. They look ok until you bend them back to inspect.

    Posted using the Full Custom H.A.M.B. App!
     
  7. stimpy
    Joined: Apr 16, 2006
    Posts: 3,546

    stimpy

    check the pick up coil for continuity , the wires are real small and thin and brittle and sometimes the vac advance movement will break them or the manufactuer make them too short and they snap off the coil
     
  8. sunbeam
    Joined: Oct 22, 2010
    Posts: 6,213

    sunbeam
    Member

    Do you have a tach? If it's moveing it's most likely in the secondary side.
     
  9. primerhotrod
    Joined: Feb 2, 2013
    Posts: 98

    primerhotrod
    BANNED
    from ILLINOIS

    Are you sure the distributor has 12 volts while cranking?
     

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