I tried to use a 3 amp output capacity buck convertor ( with auto voltage i.e. self adjusts PWM timing ratios if input voltage fluctuates e.g. when starter motor cranks engine & battery voltage drops to 9v ) & 2 700mAh lithium batteries ( to feed 4v to * when b-c could not, during engine cranking ) to replace my honda F20a 's *' resistors. I fitted 2 1" inductor rings & 15000F to damp b-c's +ve 12-14v input. This engine could start & run, but [i] the usual open loop ( when ECU activates * til O2 sensor produces a voltage of 0.65v ) did not appear [ii] when I step on throttle to accelerate car, ECU could not activate injectors long enough to inject enough fuel ( this inadequacy was visible on my digital voltmeter which receives & reports O2 sensor's output ), so acceleration was less than usual. This ECU ( made by NEC in 1990 ) [i] activates * by connecting *'
-ve ground, [ii] seems cannot function as usual if I draw +ve 12-14 v from cigarette lighter socket, I'll try to draw +ve 12-14v from ECU & see if ECU can work as usual.