P1514 REP issues with recent P2135 issues

[squeeler642]

Just today started getting the dreaded REP message and P1514 code on my 2003 Tahoe. Recently fixed the P2135 code... replaced the TAC module, pedal position sensor, and ultimately tore into the harness where I found butt splices put in there by somebody before me (I guess when they replaced the TB connector). I cut out all the splices and soldered all the wires, and have had zero issues for over 1,000 miles of driving.

Then this morning leaving for work, I got a REP message AGAIN to my dismay... but with a P1514 code this time. Odd. Never had this issue before with all my rustling with the throttle A/B circuit correlation errors. Per a recommendation elsewhere on the forum, I 2x'd the values in the P1514 error table and was able to get on the gas enough to drive it into work just fine. If I matted it, it would REP again at between 2500-3000rpm, however this was an improvement from the first times it was happening at around 1700rpm.

Attached are the modified "2x error" tune and two logs from my way into work this morning. Maybe someone can make some sense of the data in there. I am really trying to discern if I have a MAF issue, TB/TPS issue, or whether the gremlin may lie somewhere else, maybe in the tune. I just think it's bizarre that I fixed the P2135 issues and now I have an issue with similar problem symptoms, but now with different codes.

Other relevant information... this truck has had a 6.0L swapped into it, and I had it tuned by a performance shop at that time and have made some modifications to it with the help of this forum to improve drivability etc. Effectively haven't popped the hood since fixing the P2135 issue ~1000mi ago as I mentioned.

Really appreciate any insight any of you have. Thanks in advance.

[squeeler642]

Was having permissions issues attaching on the original post. Here are the attachments.

[2xLS1]

The VIN says it is a 5.3L FF, Engine type is set to 6.0L and Cylinder volume is set to a 6.16672L. What exactly do you have?

[bk2life]

both of your logs tell us nothing besides your O2s are working.
youre not loogging anything besides speed.

do you know who to set up the channels for datalogging?
your tune looks nice as far as smoothness goes
but we cant see anything else due to your log not having any real info to present..

[squeeler642]

The VIN says it is a 5.3L FF, Engine type is set to 6.0L and Cylinder volume is set to a 6.16672L. What exactly do you have?

Truck was 5.3L flex from the factory, swapped in a 6.0L with a cam and everything else is original. The flex injectors provided enough overhead fuel capacity such that the OEM injectors didn't need to be replaced.

I have always thought that was odd that those numbers were different. Figured the 5.3L on the VIN couldn't be changed, but the engine type is just a drop-down and that's correct, but the cylinder volume you provided I'm not familiar with. Did you just 8x the cylinder volume?

[2xLS1]

Did you just 8x the cylinder volume?

Yes. Sometimes if an engine has an overbore people will add that in but the stock value you typically see with a Gen 3 6.0L is 74590. It can effect air calculations. Engine type is just an identifier. One other odd thing I saw was in the DTC list the P0121 is set to NER but the SES enable box is checked. On every other t03 Tahoe file I looked at it is NER and the SES enable is unchecked. I doubt that is a problem just seemed odd. And the table you said you 2Xed is increased more than that comparing to a stock file so it must have already been increased. ECM 14041 has been changed too. I think it is still a ETC sensor/wiring issue you have going on. I don't think I've ever fixed a REP issue with tuning.

[squeeler642]

I think it is still a ETC sensor/wiring issue you have going on. I don't think I've ever fixed a REP issue with tuning.

I think this is the sort of sanity check I was looking for. As many weird tune things as there are going on here, given that changes were made and the previous REP issues seemed to have been resolved... my mind was headed towards sensor/wiring issues. Maybe I'll go pull around on the MAF and TB wiring just to see if I can get anything to throw the P1514 code when I get home.

both of your logs tell us nothing besides your O2s are working.
youre not loogging anything besides speed.

do you know who to set up the channels for datalogging?
your tune looks nice as far as smoothness goes
but we cant see anything else due to your log not having any real info to present..

What parameters would give us the info we need to be able to tell? I was rushing into work, had a 10:00 meeting I was trying not to miss. I loaded a previously trimmed down list of channels that was meant for something else, I didn't double check to see what all was included.

Thinking MAF Hz, throttle command, throttle position... I typically include speed, commanded and WBO2 eq, coolant temp, and trans gear, just to help me understand what all else is happening. I think this trimmed channel set I used had lots of stuff trimmed out to maximize the polling frequency.

[squeeler642]

Yes. Sometimes if an engine has an overbore people will add that in but the stock value you typically see with a Gen 3 6.0L is 74590. It can effect air calculations. Engine type is just an identifier. One other odd thing I saw was in the DTC list the P0121 is set to NER but the SES enable box is checked.

Are these things worth changing? To some extent of the tune that's in it works I'd rather just leave it. That said, it's become clear how much of a hack job this tune is in nearly every interaction on the forum... So maybe some of these things are worth correcting.

[2xLS1]

If it runs ok I wouldn't bother changing it. There are many other things I saw in the tune that I would do different be everyone has their way of doing things.

[squeeler642]

Quick update from my commute home... Now I'm getting P2135 codes again. This is an electrical gremlin from hell.

At 26m39s in this log, the truck lurched forward (as if I had stabbed the gas) as I was gradually accelerating before coasting to a stop. Seems like the throttle body is doing its own thing sometimes or something........