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  •  » 67 mustang 390 spark problems

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    11/21/2013 4:30 PM  #1

    Gemdiam
    FYI FORD Member

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    Registered: 4/13/2013
    Posts: 26

    67 mustang 390 spark problems

    Hey all,

    I am working on a 67 mustang...390 engine...the car would cut out at moderate rpm so the mechanic looking at it yesterday took a few plugs out and while turning the car over noticed they would spark ok, then not spark at all and then have a weak spark all within the same turn of the key. The car has a points distributor which is a new rebuilt, new cap, points, wires and coil....he is very perplexed...any thoughts?

     

    11/21/2013 4:52 PM  #2

    jerseyjoe
    I FYI 24-7

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    Registered: 4/01/2013
    Posts: 789

    Re: 67 mustang 390 spark problems

    Gemdiam wrote:

    Hey all,

    I am working on a 67 mustang...390 engine...the car would cut out at moderate rpm so the mechanic looking at it yesterday took a few plugs out and while turning the car over noticed they would spark ok, then not spark at all and then have a weak spark all within the same turn of the key. The car has a points distributor which is a new rebuilt, new cap, points, wires and coil....he is very perplexed...any thoughts?

     
    You didn't mention if the condenser was changed...if not change it ...jj

    "Never put a question mark where God put a period "  Richard Petty
     

    11/21/2013 5:00 PM  #3

    Gemdiam
    FYI FORD Member

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    Registered: 4/13/2013
    Posts: 26

    Re: 67 mustang 390 spark problems

    The rebuilt distributor came with new points and condenser....I bought a pertronix today and matching coil....

       •Thread Starter
     

    11/21/2013 5:48 PM  #4

    jerryF
    FYI Addict

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    From: Franklin, Tn.
    Registered: 4/01/2013
    Posts: 196

    Re: 67 mustang 390 spark problems

    so you're running the pertronix now?

    jerry
     

    11/21/2013 9:19 PM  #5

    Gemdiam
    FYI FORD Member

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    Registered: 4/13/2013
    Posts: 26

    Re: 67 mustang 390 spark problems

    Ordered pertronix....hoping it will fix issue...

       •Thread Starter
     

    11/22/2013 1:59 PM  #6

    GPatrick
    Senior 24-7 FYI Addict

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    Registered: 4/01/2013
    Posts: 1,083

    Re: 67 mustang 390 spark problems

    Almost sounds like a bad ignition switch or ignition wire.  If you are testing your spark while cranking, then your ignition is fired from the solenoid.  The wire from the solenoid or the contactor inside the solenoid may be faulty causing your inconsistent spark.

     

     

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