stan2004 posted:Lou1985 posted:stan2004 posted:...1) Run the engine without the passenger car load. For the same 50 sMPH speed, this reduces the power demand on the transistors, diodes, etc. on the PS2 board. If the shutdown speed increases to, say, 60 sMPH that would be a telling symptom. Or, if your tests were without load then add as many heavy cars as possible to make the electronics work hard to achieve the same speed. Then, if the shutdown speed decreases to, say, 40 sMPH that would be an equally telling symptom.
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Thanks for the ideas. The engine is properly lubed. Everything turns freely when rotating the motor (via turning the flywheel). I tried the 12 pin harness trick already and it made no difference. I will try the 1st test, running the engine without the load, and see what happens.
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So did you try running the engine with NO load? Did that change the speed threshold where bad things started happening?
As before, I believe you have a power-related problem. If the tech simply puts the PS2 boards into a bench-test-fixture, it may check out fine. From photos I've seen of the test fixture, it's not clear that there's a way to load the motor electronics with the equivalent power to run a GS-4 at 50 sMPH down a track. Again, even if it is a component-related issue (e.g., a single bad $2 transistor), it's not clear on the business proposition for a service tech to perform component-level diagnosis/repair.
Ran engine with no load. Once it exceeded 40 scale mph it shut down. Ran it again with no load and sound turned off and it kept going. So it shuts down above 40 scale mph with a load or without one.
Currently checking to see how long it will run below 40 scale mph before shutting down.
