Hello everyone, i have an iron 6.0 Block with 6.2 heads, with 2001 PCM sierra 1500 (P01), 36lb Injectors the part number is (12594512), with Walbro 450lph and fuel regulator pressure (return fuel system)
so the problem is that i tuned my car in my town garage, and when the car is on WOT the duty cycle drops, it drops only when the car is on load, the garage said its a problem with fuel pump i changed it 3 times, Fuel injectors are good, sparks, wire , ignition coil everything is good, i tried something I took my friend's computer, put it in my car, and tested the car in the load and there is no problem, i tried to get into VCM Editor to see the details of my friends compuer, but its locked by another Tuner, so the problem 100% is from my Tune, there is a problem with the fuel tune! ( My tune is (Speed density) + i dont have O2 sensors on the Exhaust, i have only 1 sensor that is plugged with my AFR Aem gauge )
this is my Tune File and Data logs and i will put the data log for my friends computer