LBZ: Lbz not fueling

[Gmclbz]

Trying to figure out a problem with an 06' Lbz. S-400 and new injectors with 60% nozzles were just installed. Truck will not fuel past 40mm3 at all. Also there are no codes related to this issue. Truck ran and ran well before this. Truck sounds and idles good, balance rates are also good. Watched actual vs. desired rail and that is also good. Any thoughts or ideas?

 

[paint94979]

what is commanded mm3 vs actual mm3?

 

[Gmclbz]

what is commanded mm3 vs actual mm3?

Good question...

 

[Gmclbz]

I do know it's not a tuning issue, flashed a known working ecm and good tune file with same result.

 

[paint94979]

It may not be but if its commanding 100mm3 and not 40mm3 then that will narrow it down

 

[07metallicgreen]

was the turbo on before the injectors or everything at once? maybe check the maf and map. I had maf problems on mine and it wouldn't run right, just a thought

 

[Gmclbz]

was the turbo on before the injectors or everything at once? maybe check the maf and map. I had maf problems on mine and it wouldn't run right, just a thought

It wasn't but we have tried new maf and map sensor for the hell of it.

 

[x MadMAX DIESEL]

Maf, a/f, map, vane

 

[JoshH]

What do tables B0792, B1186, and B1192 look like?

 

[Gmclbz]

What do tables B0792, B1186, and B1192 look like?

Not sure Josh, it's a lock tune from Tony. He has looked at the tune and didn't see any issues with it.

 

[Stingpuller]

Tunes

That's why I wouldn't have a locked tune if the tuner paid me to run it! I would look at AIT 1 and 2 and the map. Put a scanner on it and check over all the pids and see if something is not reading or is maxed out.

 

[Stingpuller]

Tuning

Not saying its a tuning issue, I would bet it is not. But I wouldn't have something I couldn't change/fix myself.

 

[Gmclbz]

I'm going to try another ecm with a tune file that I know will work again and see what happens.

 

[Gmclbz]

That's why I wouldn't have a locked tune if the tuner paid me to run it! I would look at AIT 1 and 2 and the map. Put a scanner on it and check over all the pids and see if something is not reading or is maxed out.

Map seems to be no issue from what I can tell.

 

[x MadMAX DIESEL]

That's why I wouldn't have a locked tune if the tuner paid me to run it! I would look at AIT 1 and 2 and the map. Put a scanner on it and check over all the pids and see if something is not reading or is maxed out.

I agree. To many times you can't figure anything out you need with a locked tune. And even found stuff wrong in tunes that the tuner says is fine and not tuning

 

[JoshH]

I'm going to try another ecm with a tune file that I know will work again and see what happens.

What mods are done to the trucks that you're swapping ECMs with?

 

[Gmclbz]

What mods are done to the trucks that you're swapping ECMs with?

I have another spare lbz ecm that I have a license to already. I can use a tune from my old truck that had a very similar setup. Only difference is injector size but not a big deal as far as trying to see if it'll run.

 

[JoshH]

I have another spare lbz ecm that I have a license to already. I can use a tune from my old truck that had a very similar setup. Only difference is injector size but not a big deal as far as trying to see if it'll run.

You tried that, and it still doesn't fuel?

 

[Gmclbz]

You tried that, and it still doesn't fuel?

Correct, tried again today and same thing and still no codes. The ecm was not programmed for injectors but I've never had to before either. I could command 180 mpa and it would then seem to fuel more and actually make enough power to push thru the brakes. Something it hasn't done at all. Why is I can command it but won't do it on it's own. Maf, map, baro, pedal all seem to be doing what they should. I'm kinda stumped.....

 

[Harbin_22]

Buddy had an LBZ with a similar situation and we had to max out a limiter table that you should normally not have to with this setup. I will look at what table it is