02 sensor question

[strokin393]

Ok my truck is running rough so I unplugged the passenger side injectors 1 by 1 and truck ran the same didn't idle down or anything like it should have but driver side did so could the 02 sensor be bad on passenger side or the injectors? No codes no cel

 

[joezek]

Sounds like you narrowed it down to which cylinders are misfiring, but what's causing it?....Could be coils, plugs, injectors. I don't think an O2 sensor would cause it to run so bad on one side to make those cylinders misfire, I think you'd get an O2 sensor CEL first. You can unplug the forward O2 sensor on that side and force the CEL to come on, afterwards the engine will run on a predetermined (safe) fuel curve and if the O2 sensor was causing the problem, it will now run better.