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You need to check the wiring diagram for whatever donor the ECM came from to confirm how the wiring should be. Pin outs for the ECM only tell so much.

GM used the phrase “low reference” for a...

I know, but it's been 3 months. And I hate the phrase "it won't start" without clarification of crank or no crank. But he does say the logs are cranking, which I missed.

And depending on how you...

Need to post the tune also.

Have you checked the basic of why it won't start? I assume you mean it will crank but doesn't start. Are you getting spark? Fuel? Too much Fuel?

Is this not just a simple linear mx+b calculation?
Lambda=.24v+.55

Add whatever log file you have. It helps confirm map sensor setup type things.

This is why people shouldn’t make multiple threads. To much information is left out. You didn’t say anything about modifications.

But that said, you are also just trying to get it running good at...

GM parts if they can be made to work.

And don’t buy from Amazon or eBay unless a very experienced tuner has bought from that exact seller before.

It’s probably that controlling large injectors at low flow is difficult.

Just stay with the same thread. Otherwise you will expect us to remember all of the details of your build and changes.

Have you logged into your HPT account?

https://www.bing.com/search?pglt=161&q=HPTuners+repository&PC=U531&cvid=bde0060cc8f142b3ab11157005d0edc8&FORM=ANNAB1&adppc=EDGEESS

Look up “diagnostic fuel pressure gauge”.

Fully to the floor when starting cuts off fuel so not sure why you went “almost”.

There is a tune repository with only stock tunes accessed through your account on HPT site (not this forum).

You need to look up DTC's in the exact OEM Service Manual for your particular vehicle. If it's a swap, needs to be looked up by the ECM calibration.

Part numbers eliminate the ambiguity. Tuning is mostly about the details.

For anything beyond wild guesses, LOG and TUNE needed. And more details about any modifications to the vehicle. But a lot of this doesn't match my understanding of how things work, especially the...

You may want to check your voltage at the sensor key on engine off and do the math. If it works that way, check the wiring.

If I did the math correctly, the values I posted will give you 88.614 kpa. What altitude are you at?

Theoretically, 3 Bar for the same application should have the same values, but it seems like the sensors for old applications are all over the place. If the values I posted don't work, you may have...

Just because a sensor is a 3 Bar (or 1-2 Bar) doesn't mean they have the same values.

Edit: Just noticed your post count, so you probably already know this and I misread your last post.

As edcmat-l1 says, larger injectors are like filling a shot glass with a fire hose.

Those part numbers don't show up with a search on here and they don't cross reference with anything that will have a tune that HPT will have been able to read.

But I did find this. I can't open...

Map Part number?