No power at full throttle

[JC00]

So recently did an ls swap motor is completely stock with a 4l60e. Has new plugs, coil packs, plug wires, injectors, new maf sensor. Car has no codes whatsoever. It has 60psi of fuel pressure also. So my question is could it be the tune or would it be something else mechanically just needing some ideas because the car starts up fine and idles and revs in park really well. but when driving you go 100% throttle it downshift but there is just not a lot of power.


Log file: juan drive 4.hpl

Tune File:Juan 4th computer tune.hpt

[5FDP]

Depending on the weight of the vehicle, the 4.8 doesn't make much power. You are probably at 220-230hp and similar torque from that smaller engine.

I can't view the data log on my computer to see what the log looks like.

[JC00]

The car weighs around 3600lbs

[awest623]

You definitely have a fueling problem, running stupid lean. In some spots it's adding up to 42% more fuel with fuel trims. The only places fueling looks normal is at idle and on decel. Nothing in particular sticks out to me in the tune assuming you have a 4.8, have you checked fuel pressure while driving? It should be around 60 key-on-engine-off, drop down to about 50 at idle, and rise back up to 60 at full throttle.

[awest623]

If that checks out. Can I see a log including injector duty cycle?

[JC00]

What would that be located under?

[blindsquirrel]

Injector Pulse Width Avg. Bank 1
Injector Pulse Width Avg. Bank 2

[JC00]

So fuel pressure seems to be good. But i pulled the plugs and 1,3,4,8 look lean and 2,5,6,7 look really rich could it just be i got bad injectors?

Injector Duty Cycle log:Duty cycle.hpl

[awest623]

Duty cycle seems fine. Bank 2 is richer than bank 1, but both are still very lean.

You mentioned you got new injectors. Do you have the specs for those? Or a link to the website you bought them from?

[Alvin]

It needs tuning.

Its pretty lean driving and looks very rich at wide open throttle.

[reubone]

The way your map sensor is fluctuating, I think you have mechanical problems that need ironing out.