No low end power

[twotall6_11]

I just bought a 2003 F-350 6.0 diesel manual. I have noticed that from 800 to 1400 rpms my truck has no power. I have changed the oil and filters and fuel filters too. I would appreciate any help on the subject. The truck has aftermarket airaid intake, exhaust, FASS fuel system, edge juice, zoodad mod.

[Newman]

Is it smoking out the exhaust in those RPM?

[twotall6_11]

No it is not

[ULTRA DUTY]

My brothers 04 6.0L is doing the same thing. CAK and 5" turbo back. My bud is a ford tech and said the truck appears to have a "coked" up intake and turbo. Anyone agree, any suggestions.

Not trying to hijack the thread

[azkcr]

Take off the intake elbow and look down into the intake manifold.
That will tell you if the intake is "coked" up or not. But it shouldn't be bad enough to affect performance on a noticeable level.

If it is a slight lag, it's normal. Because you have a manual; when you floor it, it won't "take off" until the RPMs rise.
If it were an auto; when you floor it, it upshifts into an RPM range that will give you that snappy feeling.

Mine did the same thing until I got it tuned and what not. If you don't downshift then you won't get much power.

[twotall6_11]

Originally Posted by azkcr

Take off the intake elbow and look down into the intake manifold.
That will tell you if the intake is "coked" up or not. But it shouldn't be bad enough to affect performance on a noticeable level.

If it is a slight lag, it's normal. Because you have a manual; when you floor it, it won't "take off" until the RPMs rise.
If it were an auto; when you floor it, it upshifts into an RPM range that will give you that snappy feeling.

Mine did the same thing until I got it tuned and what not. If you don't downshift then you won't get much power.

It is a little hard to down shift in 1st gear.

[caissiel]

The truck has so much torque at 2000 RPM that it feels that there is no power at 800 to 1300 RPM and sometimes to 1600 RPM.

With my E-Con its much better.

I to have a standard also and with the trailer in tow I try to keep the RPM over 2000 RPM till I shift to 6th gear OD.

But if the EGR valve is stuck open the turbo pressure will be lower and more exhaust in the intake. Exhaust gas will not help for power. EGR valve is suppose to close when we floor it.

[lacooks]

that does sound like a sticking egr valve... or vgt is sticking or the vanes are stuck open... mine did the same, a real dog on the low end, but went away after the egr cooler delete...

[twotall6_11]

That is what I am experiencing, I can floor it at 800 rpms and it doesn't do anything tell about 1500. It is like it is flooding itself at the lower rpms with the foot to the floor. I am hoping that the egr delete and turbo clean will fix that. But that will have to wait till I get the commuter car back up and running good, maybe after the first of the year.