Truck feels fast for a little while then...................

[JustinD]

I have been having issues with my truck for a while now, did a new LB7 CP3 and LBZ regulator along with my new II turbo, then we found 3 injectors be to be bad, replaced those, truck felt great for about 3 hours, then started to feel sluggish, dynoed it 2 days after I got it back, made 523 which I understand is about normal for my setup, but it feels sluggish now?? I changed tunes and it felt great again but same thing it was short lived. I am going to try to reset TAPS later tonight and see if that works??? Any ideas?? Any help would be greatly appreciated, I am very close to just getting rid of it and buying a 1500 with a 5.3 no issues!!!

[JustinD]

I have noticed that in my log I only see 20* minjt but my tune shows 24.8-32.8 in that range on my injection timing base C table?? What could be limiting me?

[LB72004]

how old is the fuel filter, did you try changing it? try logging desired fuel pressure vs actual, this should give you an idea if it is fuel related. did you rescale the LBZ regulator?

i don't think that resetting the TAPS will help. resetting the TAPS will just reset the shift time back to factory settings and may make it shift funny for a little while. if you do, take it easy on the transmission until it settles down.

Jason

[LB72004]

add your main timing C to your pilot timing D and see if it is being limited by {B0921} injection timing max

[Dmaxink]

Post up the datalog and lets go from there

[JustinD]

Thanks guys!!! I have been work with Trent from EPR I think he may have it narrowed down but I appreciate all the help!!!!!

[LB72004]

I am very close to just getting rid of it and buying a 1500 with a 5.3 no issues!!!

you don't want to go there. hope you get this one fixed.

[JustinD]

you don't want to go there. hope you get this one fixed.

HAHAHAHA! Thanks!!

[JustinD]

Still having issues...........

[JustinD]

Can I log Crank and cam sensors with EFI? My timing is being limited, could it be possible the crankshaft pos sensor can get a screwy reading and act like this???