2.3L ('83-'97) 96 Ranger 2.3L Constantly Switching from Open Loop to Closed Loop

[SenorNoob]

The only way I can see it running that rich on all cylinders is if the air is super restricted (like new filter still wrapped in plastic, lol), the FPR is leaking (unlikely it'd hold pressure), or maybe the injectors are stuck open.

 

[ksimp]

Just in case anyone is interested, I'm attaching a FORScan capture.
Thanks

 

[ksimp]

@SenorNoob ,
My guess is the one or two fuel injectors leaking caused the upstream O2 sensor to carbon foul (see uploaded pic). So, it was unable to read oxygen content properly, thus giving a false rich reading. The replacement O2 is responding as expected (with the rebuilt injectors).
I did follow @franklin2 's advice and added seafoam to the gas tank. Maybe I added too much?
Thanks

 

[franklin2]

It will smoke if you add too much, though the catalytic converter might hide that.

 

[ksimp]

@franklin2 ,
Well it is still smoking while it is running, and it doesn't smell exactly like gas burning. Also, the engine surges, or searches, while it's running. Almost like it is not running on pure gas. Which made me think there is too much seafoam in the mixture. It's currently sitting on half a tank. Do you think it would pay to fill the tank with gas to dilute the seafoam?
Thanks

 

[franklin2]

You could. Put the good 93 in it and that should dilute it. Just sitting around with that seafoam in it is doing it some good. It's probably been long enough if it was going to do anything.