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Recent content by tbarris

  1. T

    Won’t start when warm

    Interesting comment about the alternator. I haven't had any reason to suspect it's not working though. Is there something I should check? I have 12-13v at the key BATT term, which drops to 11-12 at IGN with key on. All three terminals drop to 9v while cranking. SOL voltage drops to 8v at the...
  2. T

    Won’t start when warm

    No luck with the new ballast resistor. The situation did not change. I've checked voltage at numerous points along both the key IGN circuit (purple) and key SOL circuit (yellow/red). I'm not sure what voltage should be at all these points but here are a few examples. At the key with engine off...
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    Won’t start when warm

    The inconsistency between updates is probably in regard to my spark observations. I still think the new coil improved the spark, but now I think it was not enough improvement. Now that I'm consistently checking spark in the distributer I can see that even with the new coil the warm cranking...
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    Won’t start when warm

    Thanks for continuing to follow and offer help, makomark! Coil + is seeing just 6v, both when cold and after warmed up, and with key in both run position and while cranking. Also, when cold I can see decent spark in the distributer points, but when warm the spark is very weak, barely visible...
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    Won’t start when warm

    I see what you mean on checking voltage at the coil being dependent on the points. Makes total sense, as I'll get a full 12 or 13 v if the points land in an open position. Since I've had this gradually worsening problem for several years, I've tried every possible throttle position while trying...
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    Won’t start when warm

    Hey guys, just a little update on my Supra. It's still cranking but not starting when warmed up. I've now replaced the coil and the ignition switch. I kept the ballast resistor because the store didn't have it on hand, but I do get a 3v difference during cranking vs run position, which I think...
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    Won’t start when warm

    After talking to a local Mastercraft dealer with a pretty good service dept (they won't work on an old Supras because they have plenty of business servicing the brands they sell, but they will give me PCM advice and sell parts) I came away with somewhat of a checklist. After it's warm and won't...
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    Won’t start when warm

    Ken, please keep us posted with what the shop ends up doing, and if they can answer Mako's questions above. The thermal breaker thing is interesting. I never heard of that. Thanks guys! I'll try to work a little more on mine but can't until next week. I'll check spark and also try to check some...
  9. T

    Won’t start when warm

    I have not checked for spark during a warm start attempt. I will, great suggestion. I've been way too focused on fuel delivery.
  10. T

    Won’t start when warm

    I'm looking for help with the same problem. '83 Supra with PCM 351 starts and runs great but won't easily restart after shutting off. Doesn't matter if it's been off for 30 seconds or 2 hours. It takes a LOT of cranking, with or without pumping or holding at WOT. Choke is open. Nothing seems to...
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