sluggish throttle response no turbo fart

[zss42002]

I have a 2007 ford f250 6.0l. it has a liberator egr delete, arp studs, stage 2 afe cold air intake that ive.taken out, banks hi ram intake elbow, bd elec, boost builder but it is unplugged, also has a innovative moderate FICM, 4" full mbrp exhaust, and fluidampr.

My issue is when i get on the throttle from a stop it takes a while for the truck to move i think it is from the egr delete but been reading that it might be the tunes i am running. i have driven a few buddies 6.0l 03 and 06s and they are tuned with erics extreme street and they dont act like my truck they are responsive. my truck when i first bought it use to turbo fart when there was excess pressure. after i got the tunes and egr delete it doesnt fart. in my buddies 6.0l when on the throttle and let off suddenly it farts unlike mine. i dont know if that info. will help at all. Also to add when the truck its in park and idling i hit the pedal and it takes a second or two for the rpms to go up. Also when i hold the pedal at about 2000 rpms and let off the pedal it takes a second or two to come back to idle.

I have learned to live with the symptoms of my truck but it always bothered me but now i want to find whats wrong with it. some say it is the egr some say it could be boot broken or cracked up pipe not aligned, ebp sensor, tunes, i dont know what it could be i wanted to try a tune of yours maybe it is the tunes. i have come to 2 conclusions, it is the absence of a egr, or the tunes. I changed the ebp sensor and that wasn't it. can anyone give me any info or advice??

thank you

[06Lariat_]

Maybe an injector is bad or a throttle sensor.

[zss42002]

Were is the throttle sensor i changed the pedal assembly and nothing still same

[06Lariat_]

I think it might be on the pedal

[06Lariat_]

Also your lack of power could be the oil viscosity according to a TSB by Ford.

[zss42002]

i dont think its the oil viscosity. i use rotella t sythetic and i change it every 5k. as for the throttle sensor i doubt its that either. like i said i bought a whole new pedal assembly and i think the sensor is on there so that would be new.

maybe a injector but what baffles me is i have no turbo fart. when i hold brake and build about 15psi of boost at a stop and let off throttle i get no fart at all. thats what is really wierd.

[06Lariat_]

These diesels are a pain sometimes lol! My dads dmax has had a problem like this but it has too much power at idle. We think its a bad fuel pressure sensor maybe yours is bad but it does the opposite. Try and c if you can have it tested.

[zss42002]

anyone else have any ideas?

[twoicebergs]

First off, you shouldn't get pressure blow-back (farting) from a newer turbo. The older throttle plate was a major contributor in the 03s. However, you may still be able to cause it by doing boosted launches and not being careful on the release of back pressure. Remember, the process is stalling (like surging) the turbo wheel airflow!

Why you have lack-luster performance is unknown. Post some values, I can't guess at what's happening.
What is your MAP and EBP?
ICP/IPR?
FICM volts?
EGT temps?
Fuel pressure?
Have you cleaned your turbo?
Vane range?
Have you really checked for leaks?
When was the last time you replaced your fuel and air filters?
Cleaned or checked the EGR valve?