Fuels are variations added by the ecu to allow for wear and tear in sensors and the engine itself ie valves pistons etc.
A recent case with a vauxhall zafira illustrates this.Testing the 02 sensor off the car found it to be very sluggish.A new sensor was put in and the short term fuel trims began to change but the long term stayed at 12.5 after dropping from 14,1 with the short term fuel trims at zero.
Below the live data before the o2sensor was fitted notice open loop
Tel:07891903013
After the new 02 sensor was fitted note short term trim now giving data and closed loop.
Long term at 12,5 will drop as the ecu adapts to the new o2 sensor
lunar auto diagnostics
A recent case with a vauxhall zafira illustrates this.Testing the 02 sensor off the car found it to be very sluggish.A new sensor was put in and the short term fuel trims began to change but the long term stayed at 12.5 after dropping from 14,1 with the short term fuel trims at zero.
Below the live data before the o2sensor was fitted notice open loop
Tel:07891903013
 |
After the new 02 sensor was fitted note short term trim now giving data and closed loop.
Long term at 12,5 will drop as the ecu adapts to the new o2 sensor
lunar auto diagnostics
Full range of engine fault diagnostic services
Contact us for help
125,east bawtry road
Rotherham
south Yorkshire
s60 4lq
Rotherham
south Yorkshire
s60 4lq
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