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Customs Engine Starts, runs, then cuts off.

Discussion in 'The Hokey Ass Message Board' started by 64impala, Aug 15, 2016.

  1. 64impala
    Joined: Sep 14, 2012
    Posts: 79

    64impala
    Member

    Chevrolet Impala
    1964
    327ci
    Mallory HEI Ignition

    Problem:
    Replaced worn Distributor cap, rotor and plug wires, engine starts with no issues then cuts off after running fine for up to 5 - 10 mins.

    Fuel pump tested good, engine not over-heating, engine will restart cold.
     
  2. Hot/bad coil?
     
    henryj1951 likes this.
  3. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    up arrows ... gets my 1st thought / vote
     
  4. 64impala
    Joined: Sep 14, 2012
    Posts: 79

    64impala
    Member

    The coil is relatively new, however I understand that new parts can fail at any point in time.
    Is there a test or procedure that can validate a "Hot Coil"?
     

  5. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    i haven't taken the time to change out (whatever it takes ) yet
    to solve a similar problem on a 47 chevy truck 6cyl...
    POINTS
    it has intermittent stall , circuit interruption like it
    goes OFF for 1/100th of a sec -n- back on.
    i cure it here one of these days ...lol
    it idles perfect runs without popping on banging off -n- on,
    you can BARELY feel it at ROAD speeds.
    if and when i cure it (i'm SLOW no really slow)
    i'll share the results...
    anybody wanna guess along the way we'll get us a WINNER after the FIX...LOL...:cool:
     
  6. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    HEI might do it also
     
  7. If I understand this. You had not problem until you made changes? Put the old cap,rotor and coil back on to see if the problem goes away.That will narrow the trouble down some.Did you use the Heat Sink grease under the coil?
     
  8. 64impala
    Joined: Sep 14, 2012
    Posts: 79

    64impala
    Member

    Before trying the old cap/rotor (coil was replaced a year ago, so no old one), I started the engine
    in 90 degree heat with no issues, ran it for 8-10 mins., turned engine off, restarted right away, ran engine for another 3-4 mins., turned engine off and then restarted with no issues.
    I could not get it problem to repeat itself so far, so I will cold start it tomorrow in cold temperature (65-68 degrees) and re-test.

    In the mean time, I'm not familiar with "heat sink grease", what is it and how do I apply it to the coil (bottom/top?), layers?
     
  9. ooppps I made an error. The grease goes between the module and distributor body. If you changed the coil in the cap,Have a good look at the 4 screws that hold it in. One of those screws is for a ground. It must be totally clean
     
  10. Hot Rod Nut
    Joined: Jul 1, 2006
    Posts: 546

    Hot Rod Nut

    I agree, happened to me last week, changed coil, problem gone.
     
  11. Donald A. Smith
    Joined: Feb 19, 2011
    Posts: 273

    Donald A. Smith
    Member
    from Brook In.

    Had same problem on Allis Chalmers Farm Tractor Changed coil Bingo Runs great
    !!
     

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