I have a built lsx454 with e38 ecu, speed density tune and today i went for a drive and scanned with hp tuner. My problem is the stft read zero across the board.
The car was up to temp. Why would it be zero stft

 

Did it indicate that the PCM has entered Closed Loop operation?

Rick

 

yes it was in closed loop. Its shows O2 mv but all 0's in stft

 

I found the problem, fuel system fault

 

Well i actually didnt find the problem
I was getting a dtc for fuel system , throttle and throttle body, number 1 injector. I replaced the throttle body plug with a used one from one of my old engine harnesses and that fixed all faults
except fpr no 1 injector. I could start the car now but had a small miss from no1 injector I ran new wires, put new plug on it and still a fault. So i pulled the plug on the ecu to check it and the pins, found nothing and plugged it back in. WTF, no1 showed no fault but now i was getting dtc for throttle, cam sensor , iat sensor and oil pressure sensor so now its a no start again.
Ive pulled all grounds and sanded surfaces for good contact, ohmed entire harness,visually inspected , still no start.
This all started when i changed valve springs, when i put back together i got dtc , no start.
I also bought new software, flashed all computers in car back to standard then put my hpt tuners back in. Also tried new ecu. Still no start.
ANY IDEAS??? Im lost