Inconsistent Throttle Response

[LTRMC02]

I keep experiencing inconsistent throttle response, some times it takes very little throttle to make the truck accelerate quickly and sometimes I seem to have to give it much more throttle to accelerate at the same rate. I don’t ever get any hesitation, jerking or anything that makes me think there’s a real problem with the truck. Under wide open throttle it seems to always run the same. It seems that it’s most always more responsive when cold and the lagging throttle response is mostly noticed once the truck is up to operating temps. but that’s not always the case.

I’m running the SRL+ tune on the truck and have 4” straight pipe. I didn’t dive the truck long enough stock to remember if it did this before.

What does the throttle directly control? I know like a normally aspirated gas engine you have a throttle plate that regulates air flow then fuel is electronically controlled by the mass air flow sensor and computer but there is no mass air flow sensor or throttle plate here? I have a temp sensor in the intake but no MAF.

[Mingof350]

i would guess its the tune but not sure. might try and turn it back to stock and go from there might think of goin with an sct tuner

[LTRMC02]

Originally Posted by Mingof350

i would guess its the tune but not sure. might try and turn it back to stock and go from there might think of goin with an sct tuner

I'm running a SCT tunner using a custom file from Gearhead automotive, the SRL+ which seems to be one of the top 3 best choices on this forum from what I've gathered. I have some other files I may try for awhile and see though.

[Mingof350]

oic well guess you can try the other tunes c what happens

[LTRMC02]

[colo_dually]

I doubt its the tunes, and that tune in particular. Could be a number of reasons for the inconsistancy you describe. First and easiest would be to check the fuel filters, then work a C&I on the EGR valve, then turbo (if you think you may have some vanes sticking.) Before we get into those clean and inspects, do you have a FP gauge on the truck, or have you installed the updated FPR spring for good measure. Sometimes FP dropping out could cause it.

[LTRMC02]

Have the updated fuel pressure regulator spring but no fuel gauge. I cleaned the turbo back in January and got rid of the EGR system at that time as well. Will be changing the fuel filters in the next couple K miles.