I've got an LS6 swap in an Miata controlled by an '04 GTO PCM with a vanilla mailorder tune to delete the basics. I figured I'd pick up HPtuners to see what the hell is going on.

The problem is the bank 2 02 drops down to zero and ST goes through the roof while the bank 1 02 gets pegged.

I checked for spark and the coil packs look OK. I decided to pull the injector clips one at a time and if I pull a clip on either side and then reconnect it the problem seems to fix itself, at least for a while.

Attached is the *.hpl showing the whacked out 02 and fuel trims and then showing them settle down when any injector is disconnected then reconnected.

Any ideas? Bad injectors? Should I swap bank 1 injectors for bank 2 injectors and see if the problem switches sides?

Thanks,
Frank

 

Swapping bank 1 injectors with bank 2 injectors did nothing.

 

Engine been sitting for an extended period of time, B4 U started it??
If so, injs could be gummed up..I see this frequently, when I clean/flow injs for the local j/y....

 

It has. But wouldn't swapping the all 4 pax injectors to driver side and having the same issue with the pax O2 indicate it's not an injector issue?

 

Sounds like maybe you have the O2 sensors plugged opposite - swap them at the plugs and your problem should go away.


Bird

 

I think I see what you mean. Swap the actual plug wiring on the same side. Will try.

I did replace an O2s before from an OEM from Denso to a univeral where I had to wire in the plug. But after I swapped them side to side there was no difference.

Rockauto has denso OEMs with plug at 37 so I'll pick up a couple just to have and try but I doubt this is the issue.

Frank

 

hadn't thot of that!!.. Getting old is not all it's cracked up to be!!
I now recall we had a Vette that had the plugs swapped...Same thing.

 

Duh, finally understand. Swap B1 plug with B2 plug. I shouldn't read the forum at 1am afte having a few too many beers!

Thanks,
Frank

 

Bumping this. Swapped leads and the problem swaps banks. O2 lead wiring problem?

Guess I'll check continuity on Low and High.