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Working too late one time, I by accident switched front and rear injector wire.
Blue connected to white and white connected to blue (how dumm can you be....). At start up the engine run ok, but it progressively ran worse.
The front sensor was leaning out the rear, making the rear sensor reading lean afr and richen the mixture. Due to the swap of cables not the rear but the front cylinder. The front sensor therefor reads even richer, go leaner etc etc
Than I saw my mistake. Fixed it and problem solved.
You say you already disabled closed loop. But I just wanted to inform you about my mistake. You never know..
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