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Originally Posted by Kodename47
Same as the MAF, calculate the fueling error and multiply the commanded AFR as required. Need 5% less fuel, multiply the table value by 1.05.
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I suppose if it is caused by the AVCS that I could adjust the whole rpm row where it's occurring, in all loads? I'm going to start out with the small change I showed above next time I flash and see that it doesn't mess anything up.
I am doing it just for fun and out of interest. I think if the timing doesn't make any problems when it get's warmer that I could just leave it as it is. The car runs great.
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The Lambda sensor is a gas sensor. Unless you were to literally flood the exhaust with fuel, unburnt fuel is not detected. Think about it like this, if you have a lot of cam overlap there can be air bypassing the cylinder and therefore the reading can be lean. But you can't have a reading that is richer than the mixture in the cylinder. Unburnt fuel reaching the exhaust will be almost always be when there is cam overlap and therefore a lean reading will occur.
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Not sure I understand that. If the fuel is not in the cylinder during combustion (because it bypassed the cylinder through the valve over lap). And the fuel in the exhaust is not being detected. Why would it read lean? Why wouldn't it read accurately? I mean the fuel is not there, and it's not being detected.
On the other hand, wouldn't some of the fuel burn in the runners before reaching the sensor? If that was the case (don't know if that is possible), it could read richer than the combustion taking place in the cylinders?