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not respond quickly but mine just seems to put out a constant voltage no matter what.
Mike,
You may be confused about how the system works. The O2 sensor makes voltage based on the amount of Oxygen in the exhaust compared to free air. It does not know anything else. In open loop, the sensor should put out a constant voltage. When the temp sensor tells the system go closed loop, the FV changes the mixture based on the O2 sensor voltage. This changes the composition of the exhaust and causes the voltage to change in a feedback loop. Engine management systems are not accurate enough to maintain stoich within the 0.1 AFR needed by the cat, so they all dither the mixture back and forth of stoich to get close to a 14.7 AFR average. The CIS lambda on your car was designed to be lean everywhere and needs a default, pulsing FV to get near a basic fuel curve. It is a little confusing at first, because when you adjust the mixture screw you are only effecting open loop, cold start and +35% throttle, because on a operating system, the O2 sensor trim brings it back to stoich within a wide range. A high open loop dwell means a richer mixture, however in closed loop, you are looking at the correction factor and a lower dwell means a richer mixture. Got it ? My experience is that these cars run best with a hot closed loop dwell around 20-30 and the vacuum retard disconnected and pluged with the idle speed reset.
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Paul
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