AFR goes lean after track day

[ludee]

Hello, i have this problem since last track day, afr goes lean (+18) and return normal.....another time lean........

any idea?

Attach datalog and calibration, thanks a lot

[Hondata]

It is the lambda itself by the looks, because the output value is exactly the same as when the injectors are shut off.

[Rubenlin]

Is lambda known to go off slightly at times?

[ludee]

Lambda sensor only have about 6.000km but i can try with new sensor if you think that its a problem.

[ludee]

I can buy a standard bosch 4.9 lsu sensor or i need AEM sensor with resistor?

[Spunkster]

You need to get the correct wideband for the kit you have, they are not all the same.

[ludee]

Ok, AEM part number is 30-2004

If sensor is wrong and i put in open loop, will the fault desapepear?

[Spunkster]

Check with AEM for the correct sensor for that kit. If it is in open look it is not using the wideband.

[ludee]

Yes, i check it, AEM sensor part number is 30-2004

Ok, if i put in open loop, the gauge reads good if sensor its wrong? And if i put in open loop and still same, is not sensor problem, right?

[Spunkster]

It will not read correctly until you replace the sensor.