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Message: <blockquote data-quote="140dB" data-source="post: 1417817" data-attributes="member: 10996">shawn,i made my own 02 sensor with the 3914 ic too.my circuit is similar to yours, with the addition of a 39k resistor in series on the input. and the resistor between pins 6 and 7 is a pot so u can fine tune. on the supply side a 10 ohm resistor in series wif 12V, a 100uf cap for filtering and a 15v zener. i did not use any input cap.my ecu is 4g13 mmc.the leds do dance about for part throttle driving. floor it and see it go rich constantly.this device helped me go fast on the higway without wasting too much fuel. i would floor it just before the point it kicks into open loop (usually 80-90% throtle). and if i accidently go open loop, i back off throtle till it goes back to closed loop (abt 70% throttle ).hope this helps</blockquote>

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