Fuel trims

[fano45]

Hi guys

Could someone in the know please explain my fuel trims. The values are after driving to store and parking idling for couple minutes

 

[fano45]

I suspect the car to be running rich. Economy hadn't been good for past few tanks. Averaging 12 litres per 100km never hitting 5k or above

 

[fano45]

Anybody?

 

[montana]

What are you using to capture this data ? Is it known to be reliable?

 

[fano45]

Obd reader and torque app

 

[montana]

I am at a bit of a loss with that, the internet suggests that it could be many possibilities. I take it you have no "documentation" ?

 

[fano45]

Nah I just need someone to confirm if what I'm reading is correct in that the cat is running rich

 

[Foxspeed]

will be if its not to full temperature....

 

[fano45]

Car was driven for a while before takie screenshots as mentioned above. Any idea if the long term trim can be reset?

 

[fano45]

Ok this is weird. I disconnected the upstream sensor electrical connector and the car started with no eml light. The long term fuel trim still stayed constant at -26%. The short term stayed constant on zero. Reckon my upstream sensor is buggered