2013 tahoe rough start/stumble.

[Asmodaues]

Good afternoon.

I have a 2013 tahoe, 5.3 flex fuel, 134k miles. I have a issue where when I start it stumbles but not enough to die. It will smooth out and run fine after that. It does it when its cold or has sat for a bit. There are no issues after it. It runs fine, strong, has power. No hesitations or shaking and I average 16-17mpg.

I am dealing with a P0446, P0172, P0175 and P015D codes. I have a basic Zurich ZR11 scanner that can view live data and graphs. Alcholol percentage is at 80% however I do not have a scanner than can reset it.

I replaced my charcoal canister and purge canister hoping to fix the 446 code. I have run B12 cleaner through the tank. Cleaned the maf and throttle body.

Attached are some pictueres from my scanner hoping to help diagnose my issues without being a parts cannon.

 

[Fless]

Long-term fuel trims indicate very rich condition on both banks. Measure the fuel pressure on the rail, key on, engine off.

What fuel are you using, specifically the ethanol content. E0, E10, E15, E85?
Will your scanner show the fuel alcohol (ethanol) content, and does that somewhat match the fuel that you're using?
If not, reset it with a capable scanner.

At hot idle, what does the MAF report in g/sec (not in lbs/min, please). It should be somewhat close to the engine displacement in liters.

 

[Asmodaues]

Long-term fuel trims indicate very rich condition on both banks. Measure the fuel pressure on the rail, key on, engine off.

What fuel are you using, specifically the ethanol content. E0, E10, E15, E85?
Will your scanner show the fuel alcohol (ethanol) content, and does that somewhat match the fuel that you're using?
If not, reset it with a capable scanner.

At hot idle, what does the MAF report in g/sec (not in lbs/min, please). It should be somewhat close to the engine displacement in liters.

At hot idle this is my MAF. I will get a fuel pressure tester tomm and check it at the rail. I try to run e10/15. I got into some Jumpstart 93 that apparently can have up to 30%....wont be using that anymore.