WHen the car warms up, i.e. cruising 10 min on the highway, cruising at a constant throttle position at 60MPH, the motor appears to be running out of gas. It seems like the ECU leans it out and I have to touch trottle a little more to get smooth cruising again.

Any ideas?
THis is with B16, PW0 and constant fuel Pressure of 39PSI. Injectors are clean. Plugs and Distributor are fine.

 

check all related sensors/wires and get a new fuel filter..but it sounds like it could be your foot..hehe

 

With fuel, it stays dead solid at 39PSI, I'm pretty sure there is nothing wrong with my R foot

 

i think that may be kinda normal..i drive to california and back here to arizona alot and it seems like that happens a little,nothing is perfect(that is untill i went over every aspect of the motor:air/fuel/spark)i would suggest doing a good tune-up..add some extra grounds..check all your electrical connections and use good quality spark plugs like ngk or denso..good luck

 

at first it made sense that the TPS could be the culprit but I checked it on my scope and output is perfect. Hmmmmm.

 

Just for giggles, as long as you've got a scope, check the O2 sensor.

 

dam i had the same prob. with a b16 in a ef i did a while ago...hmm i wonder what it is

 

o2 sensors are new...

 

when did it start? how long has it bee doing this?

have you triple checked your wiring into your PWO?

have you tried swapping the 1 and 2 o2 swires around on the ecu
mine did this i swapped the o2 pins around at the ecu fixed it