2011 Malibu 2.4 ecotec p0171

Sorry for not having replied to your post sooner. I have been focusing on what's been going on in my homeland. I would move away from the MAF as the 100% calculated load suggests a good MAF.(non-turbo). Since it cranks, but doesn't start now after pulling the fuse, you just have to see what you are missing. Spark and/or fuel.

I understand your frustration. Cars and diagnostics are hard. There's a lot of variables, and it's not getting easier.
It's also hard to interpret someone else's test results with inadequate equipment on a system they don't fully understand.
I'm not underestimating your intelligence, and I'm sure you'll be able to get this straightened out.
I just have been trying to get confirmation from you that you are still infact dealing with the same P0171 trouble code. Yes, that code keeps coming back, or no, the code has not returned but the car still doesn't run right.
The first repair you mentioned about intake tube perfectly explained the code and symptoms. Then the next bit of information was that after that repair, long term fuel trim was still around +10%. This may or may not indicate a problem depending on symptoms or codes. That's why I've been asking you for that critical piece of information.
All of the tests and advice in the world won't be worth a fart in the breeze if everyone is not on the same page.

Regarding the fuses you removed leading up to the no start, simply disconnecting the battery terminals would have been enough. No need to touch the fuse box.
Check to make sure the fuses you removed are not popped or damaged, and that they are installed in the correct female pins. It may sound stupid, but some fuse boxes have empty slots where you could place a fuse incorrectly.
Good luck, stick with it.

The fact that it’s not starting now that I have reset the computer to factory defaults leads me to believe my problem is the ckp. May have been the problem all along. Also I’ve never had a freeze frame include advance ignition timing. I checked this against the freeze frame on my other Malibu with a different dtc and It didn’t include ignition timing in its freeze frame. I was also having a hard time when it was warm outside getting this (p0171) malibu 2.4 to go past 2000 rpm’s without lightly feathering the pedal to get it up to speed (and no it wasn’t in Limp mode). It would just spit, sputter, stall or not move if I didn’t take the rpm’s up very gradually. This also makes me wonder if I was having multiple problems with one being the upstream 02 sensor. Yeah it past the o2 sensor test but only when it was 13* outside. I also wonder if I’m not having multiple problems and not just one making some of these tests have a false positive pass /fail.

Also maybe I wasn’t clear about the code coming back or not coming back. I’ll try to clear that up now. The code was never cleared. I didn’t want to clear the code until after the wot test monde had asked for with the original factory maf. If the code wasn’t cleared then code didn’t come back. It was always there. Understand? I didn’t clear the code until I tried moving forward with changing the maf sensor yesterday after waiting a couple days to see if there was any response to the wot test video. Now the codes are all clear and computer is back to factory defaults and won’t start. I’ve checked all the fuses and they are fine and in the correct spot. Also I can here everything come on when I put the ecm fuse back in place.

" I was also having a hard time when it was warm outside getting this (p0171) malibu 2.4 to go past 2000 rpm’s without lightly feathering the pedal to get it up to speed (and no it wasn’t in Limp mode). It would just spit, sputter, stall or not move if I didn’t take the rpm’s up very gradually. "

This would make me want to check fuel pressure/leakdown and if needed check power and ground to fuel pump and current draw.

Also maybe I wasn’t clear about the code coming back or not coming back. I’ll try to clear that up now. The code was never cleared. I didn’t want to clear the code until after the wot test monde had asked for with the original factory maf

Thank you for clarifying that for me.
I will tell you from personal experience, that it can take a very long time for the computer to recognize that the lean condition has been corrected and turn out the engine light.
After repairing an obvious and large vacuum on one of my personal cars a few years back, I decided to not clear codes and let the PCM figure it out. It was well over a week before the light went off.
Obviously that doesn't help your no start, but I wanted to share that experience with you.
I like the previous suggestion of checking fuel pressure, or seeing if it will fire on alternate fuel (carb cleaner, propane, etc..)
That neatly explains the lean condition, developing into rough running and further developing into a crank no start.

did the leak down tears and fuel pressure test.  It was the fuel pump. Put in fuel pump ran great for a couple weeks. I’m now getting a p0420 catalyst efficiency code.  
two videos are after warmed up 5 minutes and the next is after a 20 minute drive.  I don’t think I did the cat any favors running it so long on that lean code. 



youtube.com/shorts/unKoZEc_i7M?si=m3JZe3Wtp8Q6-j7D