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The timing is set by the PCM, unfortunately. It is advanced by having resistors in the IAT wires, showing the PCM a cooler air temperature than what it really is. I'd rather not take them out and have to resolder the wiring.
I will soon go with 93 octane to avoid this problem from now on. I noticed that I had a little spark knock at 190*. 87 just does not work for the engine now I am pushing the efficiency barrier.
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