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Nope, raising idle speed & adding timing increases vacuum - but only up to a point. Beyond some point opening the throttle more will not increase vacuum (numerically lower MAP reading), and adding...

Higher MAP, less vacuum, closer to normal atmo... that's not less pressure. Less negative pressure as referenced to baro, maybe.

'Virtual' flexfuel without the sensor does not work very well even in completely stock unmodified brand-new vehicles. Not recommended.

You can log/graph both fuel trims and wideband at the same time (in separate graphs, of course), without disabling anything in the tune, and use filters to clean up unwanted stuff. Only graph trims...

Use fuel trims to tune the closed loop regions, using data from the actual narrowbands that will be controlling it after you are 'done' (whatever 'done' means, to us weirdos who never stop tinkering...

That is... suboptimal. Yes, I know that's the way all the youtoob celebs tell you to do it. They are wrong.

I understand how scaling works so let me say some things and ask some questions that give all the indications that I do not understand how scaling works.

P01/P59 have an injector flow rate limit...

Why? Is it a race car, like the kind that gets trailered somewhere, the tune adjusted to that day's specific weather conditions, then run and put back on the trailer to go home?

'Vehicle Controls & Special Functions' button, up on the toolbar.

Aww, does somebody need a cuddle and/or a nap? Here, I will loan you an emotional support monster. She's not as ferocious and scary as she likes to think.

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If you are logging the things...

But, I had an '80 Malibu with the old pellet-bed converter on it and that one picked up big time when I cut it off, therefore, I cut the cats off everything I own to this very day. There are some...

So start a new thread with this new, unrelated problem, and attach your tune file in the ECM when the problem happens, and a log file showing it happen, like you have to do with anything like this...

Posting the tune file would be a good start, I guess.

Why is it so lean? What's the fuel pressure?

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And hell, one that kills the battery overnight is an easy one. Big draws are easy to find. The hard ones are where it only dies if it sits for 4-5 days, or only does it intermittently. If you're...

Open all doors and trip the latches, so the BCM thinks the doors are closed. Then you can still access the insides without waking anything up. Hood switches can be tied down, etc.

Pulling fuses...

Cool story. No files posted.

Those things are true but again have nothing to do with open loop or using a wideband to tune the non-PE/non-OL regions.

Sure they would. Depressing, but they would. Or at least some of them would, enough that you could play subscription tricks or price-over-volume tricks and make lots of money off the suckers. Look...

Speed density and open loop are unrelated. Closed loop with trims active and no MAF/speed density works great.

KOEO, apply vacuum to the MAP sensor while watching it in the scanner. Like you'd do to sweep a TPS. Make sure the scanner reading matches the gauge at various points.

The log shows it's idling at...

When it goes to shit at hot idle or whatever, if it's because of low condenser airflow the high side pressure will be too high. If it's because of low refrigerant charge, high side pressure will be...

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HPT will, as long as you're talking only the TCM (not a Gen 4 ECM), either T42 or T43, without even costing any credits as long as the file you're writing to it is already licensed. Or a Gen 3 PCM,...