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No codes is weird. I would think if bad coolant temp sensor, the ecu would never go into closed loop. As its not seeing that requirement set.
I know nothing about the jz. Coil / coilpacks not functioning correctly when hot?
Thats seen more on a old style coil than coil packs/plug on coil.
Does the jz ecu allow you to plug in and read realtime data?
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