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Tuning & Engine Management Engine Management, EGT temps, timing, wideband, datalogging, fuel trims, etc.

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Old 09-09-2009, 06:24 AM   #16 (permalink)
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^^ the evo hates shitty plugs......the NGK and NGK iriduims are the only ones i have seen ork perfectly in the evo's. with my iriduims i gained about 10whp over copper ngks


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Old 11-27-2009, 11:58 AM   #17 (permalink)
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You could've read the plugs to see if they were fouled or had metal on the white part meaning detonation. At this point, I'd get a cylinder compression check done to make sure there wasn't any permanent damage done.

That stuttering you were getting at the top with the 91 octane was likely knock/detonation.

Running a lower octane will cause your car to adjust its fuel trims richer. When you replace the low octane fuel with the higher octane 93 it's going to take the car a little time to readjust its fuel trims back to normal; during that time, you'll run a little rich.
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