Reply To: 57 Johnson Javelin runs and then stops after about 40 seconds

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April 27, 2020 at 2:18 pm #201222
LLOYD LAUTNER
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    Following my usual list of priorities when diagnosing a running problem. They are compression, then ignition, then fuel delivery/carburetion, in that order. Sounds like we can safely eliminate compression in this case. But we haven’t considered ignition, and I have seen this same set of symptoms in motors with bad condensers. Starts and runs ok for a short time, then dies and after a while the cycle repeats. Did you check for spark right after it died??? May well be fuel delivery, but quick and easy to check the ignition.