Gen 3 5.3 LS Leaning out

[MtnPwnd]

Jesus, and it says "their" implying that I'm doing this for someone else....I'm not. It's for my truck...

[blindsquirrel]

See the link down below this post? It's a spreadsheet where I converted all the good Gen 4 injectors over to Gen 3 format. Whatever yours turn out to be after verifying the number, will be in there. Flow rate is the least important of all the injector data.

[MtnPwnd]

See the link down below this post? It's a spreadsheet where I converted all the good Gen 4 injectors over to Gen 3 format. Whatever yours turn out to be after verifying the number, will be in there. Flow rate is the least important of all the injector data.

Good to know, thanks man. I'll look into it.

[ns158sl]

Again, dont waste your time tooning until you can get the O2s sorted.

[blindsquirrel]

And please don't be driving it around like this. You're still at the 'put together a base file correct for all the hardware being used' stage.

[RDF1]

Before you read on, please be advised and remember, not a problem. Haven't ever done this before, and just trying to get their rig going. I don't know anything about any of this so this is all new to me.


The injector data that is in there is a combination of me Google searching, "Typical tbss injector size" and watching GREG'S video about injector scaling, and paying attention to Matt Sanford's method of running a returnless style fuel system.

And yes, I completely understand that fixing just the o2's isn't going to rectify the problem completely, but it's definitely going to help the situation.

The injectors have a part number on them... Just post it here.

[MtnPwnd]

Quick update about the o2 Sensors.

B1S1 Sensor works as intended but only if B1S2 is unplugged. As soon as it's plugged in, it sends them both shorted. So I tested between the pins and B1S2 connector is shorted between the ground and the H2OS Low side. However, it's not in the harness because I unplugged the Blue C1 connector from the PCM to test continuity to ground and it wasn't there. Then I went back to the connector and retested there, no short to be found. It only appears when I plug it into the PCM, so I thought, "Ok, PCMs aren't perfect, sometimes they go bad (though very rarely)" so I programmed another PCM, and same issue so it's got to be something else. I'll look more into it tomorrow when the sun comes back.

[blindsquirrel]

Case ground harness or isolated ground harness? And case ground sensors or isolated ground sensors? And is the harness the same type as the sensors? By the way, what is the harness - factory, good aftermarket, crap Chinese aftermarket?

https://forum.hptuners.com/showthrea...ted-ground-O2s

[MtnPwnd]

Case ground harness or isolated ground harness? And case ground sensors or isolated ground sensors? And is the harness the same type as the sensors? By the way, what is the harness - factory, good aftermarket, crap Chinese aftermarket?

https://forum.hptuners.com/showthrea...ted-ground-O2s

Good Morning Blind, thanks for shooting that link. That helps a lot and explains why I'm seeing the continuity between the ground and Pin A (when C1 is connected to the PCM) so it's a case ground harness. I'll check the o2 sensor by unthreading it from the exhaust and completely isolated for the set up there.

Additionally, I found that I have the 29lb injectors pn# 12580681. Your spreadsheet was instrumental in fixing that mistake so I thank you for that.

[MtnPwnd]

Just downloaded the injector data into the truck and ALREADY made a HUGE difference. It doesn't chug at first until it "warms up" and adds 80% fueling....Blind, thank you so much for that spreadsheet.