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How can I change the air/fuel ratio in close loop control in hp tuners software without Disable the long trim &short trim ..it is 14.4 at idle & part throttle .I want 14.7
How are you brother ,
I think at close loop mode you can't target afr other than 14.4 at us vehicles at least .
At gulf or Australia spec there is "lean cruise " feature enabled at the pcm but disabled at US vehicles .
May Andre and other experts share their opinions .
For the most part GM use a narrowband O2 sensor which means the ECU can only target 14.7:1 (stoichiometric) under closed loop conditions.
Andre if we force open loope and then dial air mass sensor can then afr target controlled ?