My 94 3.0 keep's leaning its self out under a load. EXAMPLE 5th gear 50 mph put the pedal 3/4 to full throtle, it leans the a/f ratio right down to extremly lean. So i want to have the pcm checked for program problem's. Is any one able to test this computer and verify it is working corectly.

It is extremely unlikely that the PCM is causing your lean issue. There is no practical way to field test it other than swapping it out with another PCM calibrateded for your year/engine/transmission.

I would look in the direction of a fuel delivery problem (filter, pump) or possibly a bad sensor.

cloged injectors or full pump not suplying proper flow (check filter first)


i had a simular problem lean bank 1 and 2 bank 2 max ajust

i swaped in 19lbs injectors fix problem (i wouldn't do that)
so the injectors my be cloged

Already got 19 lb injectors out of a town car and thourly cleaned and checked them, swaped out the pump replaced the filter, new maf, new tps, fuel pressure is corect and fuel volume is plenty, in closed loop mode or start up mode a/f ratio is correct, open loop it goes to hell.

have you replced the O2's at any point? right now i have the reverse of what yours is doing, i flat line the wide band any time i get on the gas past 3500rpm

I was going to replace them and go with the one wire conversion.
I read some where on here they used a 1 wire sensor and just spliced it into the signal wire. I think it was done on a probe??? They said they had no adverse affects using the 1 wire unit over the 4 wire. Only difference is it takes longer to heat up the sensor.. I was going to use one for a 95 century since the o2 sensor is like 20 bucks...

I was going to replace them and go with the one wire conversion.Early oxygen sensors were single wire. Later, they were 3-wire O2's with the 2 addition wires providing the positive and negative for the heater. In both of these configuration, the exhaust system is used as chassis ground for the sensing element.

To provide more accurate and consistent sensor voltage to the PCM, a dedicated ground has been added for the sensor. This is the 4-wire heated oxygen sensor that Ford uses today. It provides a wired ground path directly back to the PCM.

Since it eliminates the possibility of ground voltage differences between the sensor and the PCM, it is more accurate for fuel control, especially as the vehicle ages.

But in theory, the one wire o2 would work. If I had to, I am shure I could find a way to run a ground wire from the sensor to the ground wire from the computer. At work we have a very low temp silver solder that i could use to possibly solder a ground wire to the nut part of the sensor with out damaging it. Then hook that wire into the ground from the computer.. I am not woried about the heater element. I am alright with it taking longer to get up to operating tempature...