Hi,
I'm new here, I been searching all over for an answer or for even a place to get my truck worked on. I have become desperate after searching many websites on any kind of information on my Whipple supercharger that came installed on my 2001 GMC sierra 5.3l v8 when I bought it used about 8 months ago. The problem that I am having and I found this out today when I hooked up an engine diagnostics to it,
1. P0300 "Random misfire detected"
2. P0174 "System too lean (bank 2)"
I am starting to believe that my secondary injectors or maybe the computer controller module thingy that comes with the Whipple is malfunctioning. Any one here had experiences with this problem or even any solutions / hints / guesses / I'll take anything here. Thanks in advance, and sorry for the long read.
-Robbie

its been 3 days and only got 7 views and no replies. guess i will start looking somewhere else.

I'm new to the sight as well. I am not sure what might be the issues? I have a GMC wit a whipple and sold it, now I bougt an older 00 model with the 5.3L and am looking for a whipple again. Hope you find your needed help. If you ever want to sell that supercharger, let me know. -Plato

Misfires could be the result of running lean, the codes would seem to support that.
Do a test: unplug the two auxiliary injector wiring connectors and see if there's a difference. If it's the same start investigating the auxiliary controller and wiring. If it changes there must be something else.

If it's pinging let out IMMEDIATELY. Gen-III/IV engines have narrow ring lands are are easily damaged by pinging.

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"James B." '99LT_Tahoe4Dr2WD, Tuned L29 Vortec 454, 62#Injectors, Cutouts, 4L80-E 10.5"14bolt ,EatonPosi-4.56:1, Gear_Vendors, HydroBoost, (NEXT: Brodix heads, 230/240 cam, SS roller rockers, longtubes, THEN: Intercooled W200R-8psi in the future...)

I just installed my kit on my 2001 6.0 and have the same thing right out of the door. Ordered guages to monitor things better. Let me know if u figure something out!

This sounds very similar to my problem. Same code "random misfire". Very frustrating. I posted about this today. Read my post "help" by 99 Burb.

So I've gone through the wiring and its good. How do you check the controller?? Only thing the instructions tell you is your WIML lamp comes on, shuts off for a second then comes back on. And it's supposed to be good if it's operating correctly. Any other ideas?

Did you try comparing how it runs with the injectors plugged in versus unplugged? Is there a substantial difference?

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"James B." '99LT_Tahoe4Dr2WD, Tuned L29 Vortec 454, 62#Injectors, Cutouts, 4L80-E 10.5"14bolt ,EatonPosi-4.56:1, Gear_Vendors, HydroBoost, (NEXT: Brodix heads, 230/240 cam, SS roller rockers, longtubes, THEN: Intercooled W200R-8psi in the future...)