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Message: <blockquote data-quote="D7zul" data-source="post: 1064085651" data-attributes="member: 111992">IMHO, ECU control fuel & spark timingIt detects air by AFM, MAP, etc & inject fuel according to the programmed air fuel ratioAnd it checks with knock sensor & oxygen sensorThen it adjust the fuel & spark timing accordinglyVTEC, VVT, etc has another set of programming n sensorsThis is from my knowledge la. I could be wrong <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" />---------- Post added at 01:19 PM ---------- 6 hour anti-bump limit - Previous post was at 12:54 PM ----------ECU didn't detect a bigger spark. It just detect knock & oxygenIf it detect knock, it will inject more fuel & retard spark timingIf it detect less oxygen, it will inject lesser fuel & advance spark timingIn the case of bigger spark, the oxygen has been burn completely..So, ECU will reduce the fuel & u'll get better FC <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" />I stand corrected <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" /></blockquote>

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