Bad coil, never saw that before

Discussion in 'Small Block Tech' started by Gulfgears, Sep 13, 2019.

  1. Gulfgears

    Gulfgears Gulfgears

    I've posted about my carb issues and crappy running engine.
    Well, here's the rest of the story.
    Got under car and found a weeping fuel line back by the gas tank and on top of the cross member. Number 2 son was helping out and said we were going to replace line with a piece of rubber as a temporary fix. Once it cools down we will put in nice preformed lines.
    Next was on to install the electric fuel pump. Number 2 son was dead set against that idea, so I said go for a ride with me and see how stupid this thing is running, you'll see it vapor locking.
    As luck would have it the guy who does the involved work on this car (timing chain) happened to outside his shop so we whipped in for an opinion.
    He took a look as engine was idling poorly, and then promptly died.
    His suggestion was to check out the coil as it doesn't seem like a fuel problem.
    So today was spent installing a new coil, both the big one and the little one that hangs on the side of the coil. This stuff was last touched in 1966 when the car was built. Amazing!
    Took car for a test ride, and guess what? No more stupid cutting out !
    Before everybody comes on and passes on my technical skills, this is a hobby for me and I enjoy doing battle with the car.
    I've rebuilt engines in my distant past, but electrical just pam boozles me.
    Oh, number 2 son says he likes to just plug his car into the OBD and then fix what it needs. Thinks carbs are really a puzzle to him. Oh, he's 47, and ran his own shop for 10 years, doing electronics and electrical stuff.

    During road test I wound this thing up to 5,000 rpm, nothing went bang, I was surprised.
    Julian and Briz like this.
  2. Briz

    Briz Platinum Level Contributor

    Not going bang is a good thing
  3. ragtops

    ragtops Gold Level Contributor

    I just had to change my first known bad coil very recently. It was cutting out a little, cold, hot and in between. First came plugs, then wires, cap and rotor, points/condenser. When all that didn't fix it I changed the new (maybe 3,000 miles) coil, forgot the brand but nothing cheap. Put the original AC Delco coil from 1966 and it runs perfect now. You never know, on mine new was bad and old was good. On yours just the opposite.
  4. Gulfgears

    Gulfgears Gulfgears

    I just didn't want to go down that bunny hole of "that didn't work, let's try this" instead of doing it right and seeking knowledgeable help.
    Back when I was a broke kid I had n old chevy that would just quit when it got hot, let it cool down and it would start right up until it got hot again. That was a coil too.
  5. 69a-body

    69a-body Well-Known Member

    I had one that couldn't keep up with rpm. Progressively got worse until 3500 rpm was all it would twist in neutral.

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