Wideband AFR and Lambda 1 shows different value

[Ümit]

Hi everyone

subaru sti link G4x plugin ecu version wrx11x

wideband aem 30-4100

wired to rear O2 an volt 7

present fuel is E85

I did already some test and see sensor is working 

when I remove the sensor socket I see the an volt for 2.36

when I test the sensor full rich and lean also shows correct value

but when I start the car at idle couple minutes later lambda shows richer then afr gauge

calibration is also ok

many thanks inadvance

[Ümit]

These pictures while engine run

 

 

[Adamw]

Yeah, unfortunately that is a common problem with the old AEM controllers.  2 Problems:  Firstly, the analog output is not very repeatable or accurate.  Secondly, there is no seperate analog ground wire, so the ecu will be referencing a different ground than the sensor controller.  You will also find when electrical loads such as cooling fans or head lights turn on the lambda will change.  

The best you can do is run the black wire to the engine block and adjust the calibration table to acheive the best match between gauge and ECU.  

What does your calibration table look like now?

[Ümit]

2 hours ago, Adamw said:

Yeah, unfortunately that is a common problem with the old AEM controllers.  2 Problems:  Firstly, the analog output is not very repeatable or accurate.  Secondly, there is no seperate analog ground wire, so the ecu will be referencing a different ground than the sensor controller.  You will also find when electrical loads such as cooling fans or head lights turn on the lambda will change.  

The best you can do is run the black wire to the engine block and adjust the calibration table to acheive the best match between gauge and ECU.  

What does your calibration table look like now?

Hi Adamw

wideband already grounded to engine block

and calibration is

0.680 - 1.365