Cummins Service
I played this same game with my 4000 for a few months. Ended up taking it to a Cummins service center they even took a bit of time ended up pulling the generator out to find a faulty ignition coil that would get hot and stop working. On cool days it ran like a champ no problems only was a problem 80 degrees and up. Unit now runs perfectly in 100-degree weather all day and night in the south. The coil was less than $50 labor was a big number. I am not sure if it can be changed without pulling the generator.
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