Big off idle stumble, whatt first? IFR? calc.vet? Something else I'm missing?

[statesman]

I got bored at a red light and killed it there.

That's not a good look. If you couldn't give a rats about getting me a decent log, then why should I give a rats about helping you?

Let me know if this flies

NO, it doesn't fly. It's a useless log... which is not surprising considering your attitude towards tuning.

Take a time out and think about if you really want my help. If you decide that you do want my help, then find some motivation to provide me a decent log... and then do another log, but this time make sure that you're actually logging the wideband.

If you decide that you really couldn't give a rats, then that's alright... you've already got a better tune than what you had before.

I'm going to read over autoMAF again as I'm guessing that's what we're doing now?

Wrong!... if we were only doing an autoMAF, I'd just tell you to do it yourself.

[Supercharged111]

?? The first 13,000 frames are what you asked me for. Transients, a couple WOT pulls, and a couple decel events. I'm lost. I killed it at a red light as opposed to waiting until I got home because it wasn't worth keeping it going at that point.

[statesman]

I'm lost.

13,000 frames of the wideband reading ZERO.... what am I supposed to do with that?

[Supercharged111]

Aww fuck. I wasn't even looking at that, just the gauge. Every time I plug the thing in I have to go into the handheld and view the wideband reading there to get it to show on the software, forgot all about that. And I couldn't find the autoMAF tutorial in the tutorial section either, not that it matters.

[statesman]

Have a look at the last log you posted. When you go into decel, you get a huge split in your fuel trims. Something is wrong with one (or more) of your injectors.

[Supercharged111]

Well crap. Truck runs fine, so if an injector is to blame I'm not too sure how to pinpoint it. They were cleaned and flow tested before I installed them back in 2017 and I do have a couple of junkyard fresh uncleaned spares on hand to troubleshoot with. I know I can shut down individual injectors as the engine is running, but is there a cylinder balance test I can do too? I know the EECIV Fords were capable of this. I imagine I'd just be wasting my time with any more logs in the meantime. I can see where it repeatedly and intermittently leans out the left bank on decel.

[statesman]

Since they were cleaned and flow tested, I'd suggest you do a little test to see if it one of the injectors going bad. Swap your injectors bank to bank and see if the lean condition follows the injectors. If the left bank continues to be lean, then you'll need to look for air leaks... both in the intake and the exhaust.

[Supercharged111]

I'm thinking I'll swap O2 sensors first and make sure I'm not chasing my tail at the rate this thing has eaten them. I blame the tune for that though. Once narrowed to a bank the million dollar question is how to narrow it down from there.

[joecar]

Do you have a way of measuring temperature on each of the exhaust header tubes...?

If one cylinder is leaner, it will produce a different temperature (thermal imaging cameras have come down in price, I'm thinking of getting one).

( this may have been covered: are you sure there are no intake port leaks...? )

[Supercharged111]

I sprayed carb cleaner all around the intake a while ago and couldn't find any leaks that way. I don't know how to check if it's sucking from the crankcase. I have a Raytek Raynger ST2 that I got from my dad. Could try that at an idle tomorrow all warmed up. I just pointed it at my space heater and it read north of 400 degrees F, so hopefully it has the range for exhaust heat. My POS Harbor Freight handheld did not.