Engine/Fueling Probs at 3500 revs week after fitting PCv

Claviger said:

Did they tune the PC-V while on the dyno or just test it? Do you have an auto tune module fitted?

The bike only trims fuel, or learns, when the O2 sensor box has a check in it. With it unchecked it makes no adjustments.

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TURBO200R4 said:

for what it is worth.
in the directions says unplug the O2 sensor plug the O2 optimizer in ......
the stock bike has a closed loop area that is controlled by the O2 sensor. WITHOUT the O2 optimizer the fuel curve can NOT be adjusted below 40% throttle or 3500 rpm.
now i am assuming that means u would have to check the O2 box.
now i am the first to admit i am not an expert but i have been listing to your threads to benefit from the info.
also wondered what would happen if u did eliminate the O2.

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R-III-R Turbo said:

Did they do a map by gear?

And by "they" was it Mototuning/DLM, NDM, RPM?

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Donny said:

I assume they mapped by gears, as why she was running perfect first week ( I rode over 700 km ). Do not want to mention any names as I been their costumer for over 10years and heard only good things about them .

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TURBO200R4 said:

for what it is worth.
in the directions says unplug the O2 sensor plug the O2 optimizer in ......
the stock bike has a closed loop area that is controlled by the O2 sensor. WITHOUT the O2 optimizer the fuel curve can NOT be adjusted below 40% throttle or 3500 rpm.
now i am assuming that means u would have to check the O2 box.
now i am the first to admit i am not an expert but i have been listing to your threads to benefit from the info.
also wondered what would happen if u did eliminate the O2.

Click to expand...

Claviger said:

To clear up the o2 confusion:

The way the PC-V manual does it is based on the assumption that owners don’t have the ability to edit ECU parameters directly (as with TuneECU). This assumption drives the need for an “O2” simulator to be installed and provide a 14.5:1 AFR signal to the ECU at all times.

This is done to prevent the ECU from adapting and undoing all the work done in the low throttle sections of your PC-V map by add/removing fueling as it attempts to trim fuel back to 14.5:1.

You can also just uncheck the box in TuneECU, remove the sensor and plug the bung (or not and just leave the stock sensor in place as a plug).

The end result is the same whichever route you go, or if you do both: the stock ECU won’t adapt and undo the tuning work.

In your case it sounds like either the mapping was off or you’ve sprung some sort of vacuum leak that only manifests under certain conditions (split hose etc).

It can’t be an O2 sensor fault, your bike isn’t using one if the box is unchecked in TuneECU, it doesn’t even look for the presence of a sensor and so won’t throw a code.

Click to expand...

Claviger said:

To clear up the o2 confusion:

The way the PC-V manual does it is based on the assumption that owners don’t have the ability to edit ECU parameters directly (as with TuneECU). This assumption drives the need for an “O2” simulator to be installed and provide a 14.5:1 AFR signal to the ECU at all times.

This is done to prevent the ECU from adapting and undoing all the work done in the low throttle sections of your PC-V map by add/removing fueling as it attempts to trim fuel back to 14.5:1.

You can also just uncheck the box in TuneECU, remove the sensor and plug the bung (or not and just leave the stock sensor in place as a plug).

The end result is the same whichever route you go, or if you do both: the stock ECU won’t adapt and undo the tuning work.

In your case it sounds like either the mapping was off or you’ve sprung some sort of vacuum leak that only manifests under certain conditions (split hose etc).

It can’t be an O2 sensor fault, your bike isn’t using one if the box is unchecked in TuneECU, it doesn’t even look for the presence of a sensor and so won’t throw a code.

Click to expand...