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When it hiccups, it sounds like the cylinder fires on the upstroke, well advanced of TDC, which stops it dead, right?
I chased this problem until it blew apart the starter. The behavior began after I had replaced the CPS pre-emptively. Not believing a CPS could be that critical, I made some measurements with a scope, shimmed the device to see where its limits were, and eventually replaced it with another new one. That second replacement marked the end of the starter lockups.
Since then, a nearby auto shop had a similar puzzler, and after we discussed this, the tech solved his customer's starting problem. In all cases, once started, the CPS gave no trouble.

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Art Benstein near Baltimore
Most would rather be ruined by praise than saved by criticism.
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