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Thanks for all of the input. I’ll swap the MAF around and then stumble my way through the rest of it. We just got back from a very short test drive, and it’s doing all the car things (go, turn, stop)...

I'm pretty stoked about this! I started thinking about what the injector shop said about LS1 injectors, and remembered that for an LS1 Camaro, 99,01 and 02 had injectors that flowed 28 Lbs (may have...

Copy that. I’ll make the adjustment and see how it runs. I was thinking about the rich condition this morning, and thought of something. I am currently using a VE table from an LS1 Firebird tune...

I tried to fail the MAF earlier in this process, but was not successful (or didn't think that I was). As I understand it, I set the fail frequency to 0 Hz, and set the P0068 to MIL on first error. ...

Gstorey- good point on the bend just after the MAF. Since it’s a 5 wire truck MAF with IAT, I’ll hold off on the MAF mount piece. That would require some wiring changed and new sensors. I’m hoping to...

I’ll move it today before I mess with anything. I placed it in that location because GM recommends the MAF be at least 4” from the throttle body and 11” from any bends. I’m going off the top of my...

Just as a small update... I've been fighting this thing for part of the weekend. Today I decided to pull the plugs and look at them. They were completely black and fouled. Good bad or indifferent,...

Based on that, bank 2 appears to be acting normally. Bank 1 should be fluctuating more, but it still looks closer to normal than my earlier logs were looking. Given that just swapping the injectors...

Greg,

I have smoke tested the intake manifold with no leaks. I have not tried the other things. I don’t have a compression tester, but I can do the rest quickly. Im really hoping that it isn’t a...

DrLoch - Everything wiring harness related is grounded directly to a BUS bar, which is in turn, directly grounded to the negative terminal via 4 AWG wire. Electrically, it shouldn't matter, but I'll...

I did not directly confirm the quality of the grounds, but as a general description, the engine block is grounded with a 4 AWG wire directly to the negative post on the battery. Every ground in the...

I got home from my work trip today, and we headed straight to the shop. I verified continuity on all 8 injector power (pink) wires back to the injector fuse. I also toned out all of the control...

I'll definitely verify all 8 when I get back, but I just got a call from my son and he may have located the issue (one of the issues?). Apparently the headers were loose. I mentioned exhaust leaks...

GHuggins - You might be onto something with the injectors. All of the injector plugs were replaced with EV1 connectors to match the injectors. I didn't want any splices in those wires, so I cut...

Nice diagram, Alvin! I hope that will help someone who comes along later.

I haven’t spent much time looking at the spark, but it should be stock 5.3 tables, as read initially from the PCM. I haven’t touched them. I did notice that the line for spark advance seems to follow...

I've attached 2 logs from yesterday evening. My son unplugged the Driver's side O2 sensor after swapping the plugs around, and the log verifies that they are now correct. The second log shows that...

Funny. I’m working from a plane somewhere over Texas, but my son has swapped the O2 sensor plugs. I told him to unplug one and look for 450 mV, and he verified that he pulled the driver side plug,...

2xLS1 - I really appreciate the help, and will report back with the results. My wife said they are going back to the shop after dinner to swap the wires. I’m as certain as I can be that the injectors...

I was trying to figure out a mechanical cause of the rich bank/lean bank issue, and wasn?t considering that the sensors were sending the right data for the exhaust stream they are sensing, but that...

I’m relying on a 14 year old with mechanical aptitude and a lot to learn. I travel frequently for work and am heading out of town today. I just had an entire flight to think about what you guys are...

It’s not easy on that car, it is low and the exhaust is in the way. That said, I just asked my son to do it. He unplugged the driver’s side sensor and got a voltage drop on B1S1. Looks like they are...

I just got a call from my son. He switched out the O2 sensors for some new Densos, with no change. It?s idling really well with STFTs disabled, but the O2 sensors still do the crazy split. That...

I’m lost on where we are getting that the sensors or injectors are backward. This was the sequence of events:

1. Car fired, idled ok but REALLY rich. B1S1 O2 sensor reported way lean (8 mV), B2S1...

Sorry, it?s a swap. I was typing to quickly. It?s a 2003 5.3 out of a Tahoe. Tahoe harness integrated into 3rd Gen harness, Blue/Green 2003 PCM, 4L60E, correct TAC module, etc. it will start and idle...