6.0 Savana With P0300

[blitzed~beretta]

have a 03 savana with a 6.0 auto. 2wd. has a p0300. misses most on bank 2. #6 seems to miss the most once it starts acting up. it's had plugs, wires, I believe it had a fuel filter recently. intake gaskets about two years ago. fuel pressure is around 55psi, seems fine. I've cleaned the injectors already, and it's coil near plug. no egr. the miss comes and goes. ses flashes once it's bad enough. all scan tool data looks fine. the long and short term fuel trim goes out the window when it starts happening. o2 starts reading stupid rich and the fuel trims go max into the negative to try and lean it out. thats when it leans all bank2 out to the point of missing on all cylinders on bank2. at this point I had swapped o2s side to side to make sure the o2 wasn't causing it to go lean,then it ran fine again.could not get it to act up again. now the miss is back.

 

any ideas? what the hell am I missing? I've heard of ac leaking onto the o2 and messing with it? but bank 2 sensor 1 connector is on top of the passenger frame rail slightly behind the firewall.

[bill190]

How about swapping all the fuel injectors...

from bank 1 to bank 2

and all bank 2 to bank 1?

 

Then see if the problem moves?

 

If the problem moves, then you know it is a problem with a fuel injector.

 

If the problem does not move, then you know it is not a problem with a fuel injector!

[blitzed~beretta]

I had swapped injector #6 with #8 while apart, didn't make a difference. didn't try all in a bank with the other though.

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Swap coils. then watch your data and see if the miss moves from #6 to whichever you swapped it with