Power FC disabling sensors?
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From: MN
disabling sensors?
Ok so removing the air pump would mean you would need to disable the o2 f/b control, if you didnt disable it that would mean it would think that you are running richer than you actually are, right?
let me know if im way off here...
JDub
let me know if im way off here...
JDub
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Joined: Feb 2001
Posts: 741
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From: Queens, NY
Originally posted by cewrx7r1
Without an AP, you do need to disable the O2 idle control. Less air and same fuel = richer exhaust.
Without an AP, you do need to disable the O2 idle control. Less air and same fuel = richer exhaust.
Last edited by jr; Dec 10, 2002 at 10:47 PM.
Up noth you might say " all of you guys come here", and in the south "you-all come here". Same thing.
For the O2 idle control system to work in closed loop, it has to use FB(feed back). See, same thing.
The AP pumps into the exhaust manifold or cat depending on rpm and load. Since the cat is after the O2 sensor, nothing happening there can affect the O2 sensor unless it is so clogged up that it causes extreme back pressure. So we ignore this.
Premise 1: I have an engine idling with a fixed set fuel flow.
Premise 2: I can either pump air into the exhaust before the O2 sensor or not.
Question 1: What differences in O2 level in the exhaust will be measureable between air being pumped there are not?
Permise 3: the FD rotary engine idles with a richer mixture, to help control nitrogen oxides emissions, and to also keep the exhaust gas mixture balance at optimum for the cats to work,but this creates more carbon emmissions. Thus Mazda pumps in air to burn up the extra carbons. The O2 FB system then does a minor control of fuel to keep the AFR at optimum.
Question 2: what happens when this extra air is removed from the exhaust before the O2 sensor?
Premise 3 might not be 100% correct because it has been so long since I read about this.
For the O2 idle control system to work in closed loop, it has to use FB(feed back). See, same thing.
The AP pumps into the exhaust manifold or cat depending on rpm and load. Since the cat is after the O2 sensor, nothing happening there can affect the O2 sensor unless it is so clogged up that it causes extreme back pressure. So we ignore this.
Premise 1: I have an engine idling with a fixed set fuel flow.
Premise 2: I can either pump air into the exhaust before the O2 sensor or not.
Question 1: What differences in O2 level in the exhaust will be measureable between air being pumped there are not?
Permise 3: the FD rotary engine idles with a richer mixture, to help control nitrogen oxides emissions, and to also keep the exhaust gas mixture balance at optimum for the cats to work,but this creates more carbon emmissions. Thus Mazda pumps in air to burn up the extra carbons. The O2 FB system then does a minor control of fuel to keep the AFR at optimum.
Question 2: what happens when this extra air is removed from the exhaust before the O2 sensor?
Premise 3 might not be 100% correct because it has been so long since I read about this.
Last edited by cewrx7r1; Dec 11, 2002 at 08:09 PM.
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