Stranded 70 Coupe No spark?

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500, 472, 425, 368 Discussion, Stranded 70 Coupe No spark? in Cadillac Engine Discussion; Car was having trouble starting. With a jump it reluctantly started. Then it would not start whatsoever. Took battery to ...
  1. #1
    Nrets is offline Cadillac Owners Member
    Join Date
    Sep 2005

    Stranded 70 Coupe No spark?

    Car was having trouble starting. With a jump it reluctantly started.
    Then it would not start whatsoever.
    Took battery to autozone. Bad.
    Installed new battery.

    Car would alternately click loud or do absolutely nothing.
    Cleaned starter battery cable.

    Car cranks strong and fast and starts.

    We manage to keep it running for 5 minutes when it suddenly dies.

    Now it Really wont start. It is getting fuel. It is cranking hard and strong.
    We pulled a plug wire and did the spark plug test ,,,there seems to be no spark.

    So what would it probably be?

    Bad Coil bad distributor...something else?

    Back info...I put a used HEI distributorn out of a 74 5 years ago.

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  3. #2
    BRUCE ROE is online now Cadillac Owners Fanatic
    Automobile(s): Eldorado
    Join Date
    Jun 2009

    Re: Stranded 70 Coupe No spark?

    Assuming you have 12V input to the HRI, I'd first try a different
    4 pin module. Easy to change, no need to affect timing. If that
    doesn't help, I'd throw on a different cap & coil set. Third thing
    could be a bad pickup coil (or its 2 wires that flex all the time).
    Fixing that is complete HEI removal & dis assembly.
    If there is a lot of wear, things may be rubbing or broken.
    Bruce Roe CLC # 14630

  4. #3
    steelybill is offline Cadillac Owners Enthusiast
    Automobile(s): '85 Fleetwood FWD
    Join Date
    Mar 2009

    Re: Stranded 70 Coupe No spark?

    I think Bruce called it. The module and the pick up coil leads seem to be the first two things to give problems.
    I would suggest trying the module first, since the pickup coil is more difficult to change.

  5. #4
    69Deville is offline Cadillac Owners Member
    Automobile(s): 1969 Cadillac Deville
    Join Date
    Mar 2009

    Re: Stranded 70 Coupe No spark?

    I'd start from the top of the check list.
    1) Check the new battery. See if that one is dead now too. If it is then your alternator is toast.
    2) Check to see if the ignition wire to the distributor is getting juice.
    3) Take off cap see if there is any visual signs of an issue.
    4) Do as Bruce mentioned. Doesn't hurt to change it out either way, its probably time for that.
    Let us know how it goes.

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