Gen 3 6.0, pulling timing but not for knock.

[Brogre]

Me and my buddy decided to start tuning his truck, said truck was detuned from factory, and when he put headers and exhaust, cold air and such on it, it became a gutless pig. running super lean 24/7, we have that sorted out, got it running rich, sadly don't have a wide band currently (in the works of it) but under power enrich it will start dropping some timing, we have no clue why, its not knocking or anything. Any help would be appreciated, haven't figured out how to do the maf calibration though so it could be that.goes waawawwawawawawa bad somegimes.hplhas issues.hpt

[RDF1]

So how do you know it was running lean?

With that VE table and the LTFT showing its lean, you have a fuel pressure supply issue.

Also If you look at your Cylinder AirMass going to 0.8X in the datalog then go look at your tune and see how timing is dropping after 0.72.

Need to get a fuel pressure gauge on it before doing anything else.

[Brogre]

So how do you know it was running lean?

With that VE table and the LTFT showing its lean, you have a fuel pressure supply issue.

Also If you look at your Cylinder AirMass going to 0.8X in the datalog then go look at your tune and see how timing is dropping after 0.72.

Need to get a fuel pressure gauge on it before doing anything else.

Awesome, we first thought it was fuel pressure, but our gauge didnt work, so i flashed in some stock lq9 spark tables, at one point i had it running good, then we went a little further and got that hitch. Thanks a lot

[Alvin]

I don't see any spots where it was pulling timing.

Timing is low because the tune is that way. What are you seeing to say that?

[Brogre]

Can tell its rich from exhaust, can smell the fuel

[Brogre]

Theres a couple spots WOT where it spits down to 5-11 degrees then comes out of it, first pull was good at 15-20 degrees, then second was dropping

[Alvin]

That's what's in the tune. It isn't being pulled. its running what you have in the main spark table.

[Brogre]

So how do you know it was running lean?

With that VE table and the LTFT showing its lean, you have a fuel pressure supply issue.

Also If you look at your Cylinder AirMass going to 0.8X in the datalog then go look at your tune and see how timing is dropping after 0.72.

Need to get a fuel pressure gauge on it before doing anything else.

I also did just reset fuel trims and stuff before this run hoping itd fix it, i did think it was strange i had to increase the ve table that much for it to come out of that super lean before

[RDF1]

Can tell its rich from exhaust, can smell the fuel

You do know a lean running engine will smell rich?

If you have to skew the VE that far on a stock engine, your going to have fuel pressure issues causing that.

Get a fuel pressure gauge on it and test first.