The simple answer is closed loop works by correcting the input command based on a measure of the output error. Our O2 sensors provide that feedback.I have read here and on various forums about closed loop Vics. What are people talking about closed / open loop, etc.?
I agree with you. The part where loyd said that modern cars are misfiring is wrong. Hook up a scan tool and look at the misfire count. You'll see that they are all at zero, as long as its running normalDisagreeing with Loyd is bound to get me in trouble but that last part listing all the "issues" with closed loop systems is total crap. Yes, all those things can happen in a vehicle with a closed loop system but to blame closed loop fueling for them is the same as saying my spoon made your hair fall out. Sure, maybe I used my spoon to scrape your scalp but otherwise one is not the reason for the other.
Open loop monitors what goes into the engine (airflow, air temp, throttle position, etc.) and guesses at the proper fueling based on a predefined map.
Closed loop monitors what goes into the engine (airflow, air temp, throttle position, etc.) and guesses at the proper fueling based on a predefined map. Here's the difference. It then monitors what comes out of the engine (exhaust gases via O2 sensor) and adjusts the fueling to get the output that the map is expecting to see.
In both cases you have a fueling map. That map determines how the engine runs NOT the open or closed loop system. Adjust the map and you change how the bike runs, period, done. If the bike is surging, misfiring, or pinging, it's because the MAP is telling it to put the wrong amount of fuel in to avoid those issues (typically this is because the manufacturer's are running things as lean as possible for emissions purposes). This is why we have things like PCV's and all the other fuel modules out there. To change the map, not the loop.