2008 lmm tuning questions

Mar 6, 2021
38
0
6
Prescott Arizona
So I sold my 06 lbz got this lmm lift pump,4” deleted exhaust, dsp5, and a v2 autocal Idaho rob all this was done when I bought it thing is no position on the dsp5 feels any different?. Gas mpg sucks only 15mpg truck has a 6” rcd lift on 35s btw any idea if the tunes even are loaded?.
 

monster50iii

Member
Dec 5, 2014
309
4
18
You won't get mpgs with the lift and tires fwiw..

If you have the autocal plug it in and re-download the dsp5 file? Worth a try..
 

N2BRK

Active member
Dec 31, 2009
1,606
20
38
856 NJ
Many times it's a poorly installed DSP5 switch. Check the wires and check to make sure that they are fully inserted. I've fixed 3 in the past year and I'm not even a mechanic, LOL.
 

2004LB7

Well-known member
Dec 15, 2010
3,183
168
63
Norcal
You can also log the switch position or voltage and see if it is working according to what the ECM sees
 

08lmm72mm

Member
May 13, 2019
34
0
6
Saskatchewan, Canada
What kind of shape are the injectors in and is there any boost leaks? What the calculated fuel rate at idle? Worn injectors and a minor boost leak can make these trucks seem like each tune isn't much different from each other. My balance rates were good the cfr was 6-8. I put new sticks in at the cfr is 11-12 and I can tell a huge difference in power again between tunes.
 

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