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Switch from low to high octane fuel tables?
When the PCM records a few incidents of spark knock it will lock the engine into the low octane fuel table.
Is there any way to force the PCM to go to the high table other than adding 5-gallons of gasoline?
At the track in the hot summer months, with low octane fuel, I've had the car go into the low tables. Even though I add 5-gallons of high octane gas, unless it has time to circulate completely thru the fuel system and get to the injectors before I make another pass, it will get a few incidents of spark knock on the old fuel in the fuel rails and that will cause the PCM to start using the low octane tables again, wasting the high octane fuel I just put in.
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