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Sloooow Cranking even while jump starting! 200 1980

1980 242 DL. Won't start. Has a very slow dry sounding crank that gradually dies out to not cranking at all. This even happens while jump starting. The battery is holding 12.7 volts at rest and with the jumpers on it has 14.3 volts, while cranking with the jumpers on it doesn't go below 9 volts. I've also confirmed that I have spark at the plugs (even though my secondary resistance is only 6.5 and should be 8 - 10 ohms, I can't get a good primary reading!!! though 1.2 flashed a few times on the meter.)

I'm guessing a bad starter but would like some confirmation of that. Just yesterday it would crank fairly well for a few tries but the engine would not catch. Then it went into this slow cranking thing.

Thank you for any help you can provide me with.
Marty
--
84 245 DL, 80 242 DL, 66 Pontiac Catalina + many other wheeled devices.








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    Sloooow Cranking even while jump starting! 200 1980

    I'd say starter too. Can you check the volts at starter when under load.
    --
    john,,1985, 245:GLTi 246k mi..so.california








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    Sloooow Cranking even while jump starting! 200 1980

    I checked all cables and connections and they check out. Using a voltmeter I tested for voltage drop at starter end of Positive cable and there was little to no drop. The starter turns but really slowly.

    Thanks,
    Marty
    --
    84 245 DL, 80 242 DL, 66 Pontiac Catalina + many other wheeled devices.








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    Try the battery cable 200 1980

    My battery cable was corroded big time. Switched it out and vroom vroom or was it zoom zoom zoom?
    Miguel
    --
    '86 244 and '87 245








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    Sloooow Cranking even while jump starting! 200 1980

    Just a few ideas. Corroded battery terminals, Bad starter, Jumped timing on the timing belt.








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      Check for loose wires, including engine ground that connects to valve cover! (nmi) 200 1980

      .







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