2004 6.0 has no low end power

[ROLLERDRIVER]

Hi everybody,
I have never seen a diesel act like mine is.It has no power at all until about 3000 rpm's and then it comes on like a freight train.When i bought the truck it had been rolled and while i was rebuilding it i would have the move it in and out of the garage once in a while and the only exhaust that was on it was the turbo down pipe so you could really hear the turbo.I think it had a aftermarket exhaust on it and they took it off when they wrecked it.And then one day i started it and no more turbo noise.I have changed the air filter,ebp sensor,vgt valve,and i put on a 4 inch exhaust and i am waiting for my new egr valve i have ordered but i dont think it will help but i know it's not working.I have pulled off the intake tube and the turbo spins nice and free also.Has anyone ever seen this before.Thanks in advance.

[mschn99]

Originally Posted by ROLLERDRIVER

Hi everybody,
I have never seen a diesel act like mine is.It has no power at all until about 3000 rpm's and then it comes on like a freight train.When i bought the truck it had been rolled and while i was rebuilding it i would have the move it in and out of the garage once in a while and the only exhaust that was on it was the turbo down pipe so you could really hear the turbo.I think it had a aftermarket exhaust on it and they took it off when they wrecked it.And then one day i started it and no more turbo noise.I have changed the air filter,ebp sensor,vgt valve,and i put on a 4 inch exhaust and i am waiting for my new egr valve i have ordered but i dont think it will help but i know it's not working.I have pulled off the intake tube and the turbo spins nice and free also.Has anyone ever seen this before.Thanks in advance.

take the vgt solenoid out of the turbo and try to move the vains with a magnet.....if they are not free, then your turbo may be sticking.....usually from not getting spooled up often enough.....also, does it seem to run smooth cold???.........and do you have any codes???

[ROLLERDRIVER]

It's pretty rough when i first start it but calms down in a couple minutes.I was told by someone else that the vanes my be sticking but they didn't no how you went about freeing them up.I dont have any codes for it yet but if this doesn't do the trick i will go get it checked.Thanks for the help.I'll give it a try.

[mschn99]

Originally Posted by ROLLERDRIVER

It's pretty rough when i first start it but calms down in a couple minutes.I was told by someone else that the vanes my be sticking but they didn't no how you went about freeing them up.I dont have any codes for it yet but if this doesn't do the trick i will go get it checked.Thanks for the help.I'll give it a try.

if its missing, odds are it is one or more injectors failing....you probably have a little smoke, especially cold too.......there is a possibility you have a valve sticking that caused a pushrod to bed also, among a few other things, but 99% of the time a low power/miss cold is injectors. if it actually starts its probably 1-3 bad injectors.....tough to say just typing on here, but the problem is to diag it you need to have WDS or IDS to run a power balance while the motor is cold............Marc

[ROLLERDRIVER]

RUNNING GREAT NOW ,
Worked on the turbo most of the day to try and free up the vains and my egr valve came in also.When i put everything back together it was running the same as it had been but after about 15 min or so it started to come to life.The truck runs better than i could have ever imagined.It may still be freeing up the turbo vains but now when you let off the throttle you can hear a poping noise from the turbo like the tractor pulls (hope it doesnt hurt anything).I also want to thank mschn99 for his advice and i hope i can help some of you sometime.
Thanks again

[mschn99]

Originally Posted by ROLLERDRIVER

RUNNING GREAT NOW ,
Worked on the turbo most of the day to try and free up the vains and my egr valve came in also.When i put everything back together it was running the same as it had been but after about 15 min or so it started to come to life.The truck runs better than i could have ever imagined.It may still be freeing up the turbo vains but now when you let off the throttle you can hear a poping noise from the turbo like the tractor pulls (hope it doesnt hurt anything).I also want to thank mschn99 for his advice and i hope i can help some of you sometime.
Thanks again

the popping noise when you let off after a heavy accell is normal for the 6.0, but if it continues running rough on a cold start up, have the injectors checked so she doesnt leave you stranded.... where it seemed to still act up a little cold, sounds to me like only half the problem is fixed.....but congrats on getting that done.......Marc

[ROLLERDRIVER]

I'll let you no what it sounds like in the morning.Going to get in the 30's tonight.Thanks again

[ROLLERDRIVER]

I started the truck this morning and it ran & idled great.When my son went out the door headed for school he told me that it sounded like a jet was in the driveway.Could the egr valve plus the turbo now moving more air be what helped it on startup?. Thanks Pat

[mschn99]

Originally Posted by ROLLERDRIVER

I started the truck this morning and it ran & idled great.When my son went out the door headed for school he told me that it sounded like a jet was in the driveway.Could the egr valve plus the turbo now moving more air be what helped it on startup?. Thanks Pat

lol, yea, the egr and the turbo could cause that.......its tough with these motors to figure out sometimes how things cause other things......but just about anything is possible with the 6.0