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: a closed loop is where there's feed back involved... i.e. O2 sensors read by ECU, ECU adjusts fuel, adjusted A/F ratio gets read by the O2 sensors, O2 sensors read ECU, ECU adjusts fuel, etc. etc. : an open loop is where it is a "broken" loop... i.e. O2 sensors display a voltage, the ECU does NOT adjust fuel according to O2 sensor voltage and instead follows a pre-programmed fuel curve. this is what happens at WOT. I got it mixed up again LOL
Later, Phuong

ICQ - 59084049 GR Racing My wife's other car is a broom |
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