Left bank going lean when plugged up to PMS

[Mustang95GTS]

Well fellas, I found out why my car is surging at 4500 rpm when the PMS is plugged up, it appears that the left bank is going lean. I tried to add more fuel to the extent that the injectors were not all the way maxed out but I think this dilema is rather odd. When the PMS isnt plugged in it doesnt do it at all. Keep in mind that I have stock o2 sensors and stock injectors as well as stock MAF. The TPS is set at .98v. Any ideas why it would do this? OH and by lean we are talking anywhere from reading 1-30 when it should read about 65. Thanks

Sean

 

[VibrantRedGT]

Are you saying your O2's are 10+ years old?

 

[94TURBO5 O]

You need to replace your o2's man. The PMS is a top of the line tuning device and sensor readings are so important for function. Meaning all of your sensors should be up to par, so try replacing the o2's Are you using the stand alone?
What table are you adding fuel to @ 4500?

 

[Mustang95GTS]

LoL, yes I am still using the old o2 sensors, my fuel table at WOT is -2%, thats what they recommended before, BUT I tried adding more fuel and it still didnt work, any ideas of where to get good o2 sensors?

 

[94TURBO5 O]

If your budget can afford WBo2's then get them for the PMS (UEGO) and you can get the o2's from any auto parts store. Are you using the stand alone?

 

[Mustang95GTS]

I am not using Stand Alone due to the fact that I wont be pusing it above 6000 rpm at the moment, but the new motor should push 7000 but anyhow, how much to WB o2 sensors help compared to the stockers?

 

[Mustang95GTS]

also, how hard is the PMS to tune with WB 02 sensors?

 

[94TURBO5 O]

No exp. with that yet but it's the same except you know what your A/F is all the time. Which is a very very good thing in tuning.