LLY: defueling problems

[jdlover1]

The last three sled pulls i (dad) has pulled in, the truck just shuts down around the 200ft mark. I thought it was because of to high of fuel pressure since i have dual cp3s and running a single cp3 tune. Installed a 2cp3 tune helping that would fix it but i was wrong. Truck died at the 200ft mark again.It acts like he just takes his foot off the accel. each time. No data logging has been done since i am not home. Had a buddy at the dealership check codes and no codes have been thrown other then the barometric pressure since it is not plugged in. Any ideas what could be causing this. Any help would be great thanks.
http://www.youtube.com/watch?v=Atk2vyTd_pU

 

[TrentNell]

Tuff to tell without a log , it def cut all fuel did he let out of it after it cut a little ? just trying to tell if it limped .... the ecm will usually not cut all fuel just limmit the amount . maybe others have seen this , but i havent on my truck .

 

[jdlover1]

Each time it has done it he says his foot is planted to the floor. But when you run it on the street it wont do it. What puzzles me is that it doesnt throw a code at all.

 

[Diesel Pilot]

Wow, tough crowd there.

Since it is not throwing codes, has someone blocked the codes in the tune? For something that drastic, it should give some sort of feedback.

I would also check the lift pump, fuel rail pressure relief valve, fuel filter.

Around X-mas time, I found out what LLY's do when they sense the fuel flow to the CP3 is not enough. I had a clogged fuel filter from running B20. It was similar to what is happening here but mine did it on the street too.

Logging on the street might give insight to what is happening during a pull. Also, log every pull regardless if there is a problem with the truck or not. The data gained can be used for future outings. Even if the truck seems to be running fine, logging every pull or 1/4 mile pass can show if a problem is developing and you can see it before it's too late.

 

[jdlover1]

Yea I thought it was the fuel filter too the first time it happen, so i had the fuel filter changed, then it did it again so thats when i changed the tune. That is my plan when i get back home is to start logging each time I pull the truck. I do know that some of the safe modes have been disabled in the tune. The truck ran fine last year. Over the winter I put dual cp3s,3" intercooler pipes, lbz runners and ppe y-bridge and took out the egr system,afe intake box and flexable hose directly to the turbo. do yall think one of the mods could be doing it?