No acceleration issue in lly duramax

[Caseyantcastorena]

Hey guys new to the forum game but I have a 2005 Chevy duramax lly and I’m getting no acceleration like I push the pedal to the floor and I’m just coasting about 20 mph and also no boost. What’s going on any ideas thanks in advance

 

[gmduramax]

Check your fuel rail pressure and scan for codes

 

[Caseyantcastorena]

Check your fuel rail pressure and scan for codes

I have no codes and I have a shim and fass fuel pump

 

[darkness]

When did it start happening?

 

[2004LB7]

tuned or not?

 

[Caseyantcastorena]

When did it start happening?

A week and a half ago

 

[Caseyantcastorena]

tuned or not?

Yes I have efi live with the dsp5 switch

 

[2004LB7]

do any of those tunes turn off codes in an attempt to disable limp mode or emissions equipment? seems like it would be possible for it to be in limp mode but you should also have codes

 

[Caseyantcastorena]

No I don’t think any of my tunes do that I’ve tried switching different tunes to see if that does not change anything

 

[TheBac]

Possibly accelerator pedal sensor?

 

[darkness]

Rpm limited to about 2200?

 

[2004LB7]

have you checked for any codes?

 

[Caseyantcastorena]

I just changed the mass air flow sensor and barometric pressure sensor fixed the problem
Thanks for the feed back guys

 

[TheBac]

How did you know to change those out? What was your diagnostic tree?

 

[Caseyantcastorena]

How did you know to change those out? What was your diagnostic tree?

Well I just kept reading other forums and changed the fuel filters changed the map sensor and said well I might as well go ahead and change the barometric pressure sensor and the maf sensor so kinda just kept buying different stuff that it could possibly had been I was going to by the pedal position sensor next if those 2 didn’t work