LBZ: Engine/Fuel Limp Mode

[LBZFireMan]

I have a 2006 2500 CCSB, 310K miles, EFI Live w/ CTSII, AirDog 4G, EGR delete. The ground on my lift pump got pulled off a month ago or so and I limped my truck for the 1st time since I bought it after a hard pull. I still had all 6 gears but was limited to 2k RPM. After some research I found that there are 2 different limp modes, engine/fuel and transmission. I turned my truck off, let it sit for a minute or so, cranked it back up and it wasn't in limp anymore. After getting my lift pump fixed, the same thing happened again. I wasn't low on fuel and never had a CEL either time. Any ideas on why?

 

[Tothemax]

need to pull codes

 

[LBZFireMan]

I checked for codes both times, none were given

 

[Tothemax]

what scanner did you use. when it goes into limp it will store a code. maybe not a light but should have a code

 

[LBZFireMan]

I used my Edge Insight CTS 2

 

[clrussell]

Are you towing when the problem occurs?

 

[clrussell]

Clean the maf with maf cleaner and watch commanded vs actual rail pressure.

 

[LBZFireMan]

I wasn't pulling anything but I was accelerating hard both times

 

[TheBac]

Stock transmission? How hot a tune were you running when it limped?

 

[LBZFireMan]

stock transmission, yes. I was in my "trans safe" tune. +80-100hp? Not completely sure.