[DieselZ28]

I installed my 5" MBRP exhaust and did the DPF delete with EFI Live. Turned off all the DTCs that go along with it. On the way to work today I noticed that the truck wants to hesitate a little when I let off the throttle and go back on it. It only happens when I am using very little throttle. Example: Slowing down from 45 mph or so and making a turn and accelerating back up to the same speed. My goal this week was to baby the truck and see what kind of milage change I get. Like I said it only happens during very tame driving. At WOT its great even half throttle or better. It does not do it often maybe 4 times in a 45 mile span and not everytime I slow down and speed up again. Im thinking maybe vain position. Any suggestions. BTW the trucks tune is stock.

 

[2008 lmm]

i was having that same problem also and i changed my fuel filter and it was gone..i change my fuel filter every other oil changes so like 6000 miles

 

[08stroker250]

Is it like a turbo lag hesitation, tranny hesitation, or in need of fuel hesitation. I would think if its needing fuel or a tranny issue, you would notice it all the time, but you say its fine at half throttle or more. If its a turbo vain issue, it could be causing the lag. Hesitation can be caused by numerous things though.

 

[DieselZ28]

Think I may have solved the issue. I found a pretty good message tread about EGR tuning for the LMM. Apparently disableing the EGR with EFI Live causes this problem. From what I understand you keep it enabled and change your parameters. Here is the link. Problems with B1501 set to 'Disable' - EFILive Forum I did not get to drive the truck much today but it has not happened since I made these changes. My check engine light is on but Im getting ready to go scan it. Just looking at my DTC enables I think I know what that may be.