Slow to accelerate

[xmen]

2004 excursion 6.0...Truck take approximately 100 to get to 15 mph and 1800 rpm's, from this point on the truck runs strong...very difficult to pullout in traffic...After ready through a lot of the posts, i remover the erg and cleaned it, no change...I removed the butterfly assemble that was recommended to remove at the time you cleaned the egr, no change on the bottom, a little on top end...I removed the turbo, cleaned and reassembled, no change on the bottom, a little more on the top end...Also, no codes...what the cure? need help...Thanks...

[SynysterHD]

I'm having the same problem with my 05' 6.0 SD, it's a pig until the turbo kicks in... I'm curious to see what everyone says about your issues...

[jeeplj8]

Keep in mind you have a 8500 lb truck, it is not going to take off quickly. When you removed and cleaned the turbo were you able to confirm the variable position vanes were functioning properly?

Do you see black smoke? The turbo may not be spooling up quickly enough.

[xmen]

Originally Posted by jeeplj8

Keep in mind you have a 8500 lb truck, it is not going to take off quickly. When you removed and cleaned the turbo were you able to confirm the variable position vanes were functioning properly?

Do you see black smoke? The turbo may not be spooling up quickly enough.

This is different, no acceleration from a dead stop...the other day I could not get my truck up a small incline, I had to back down the tiny hill and go at it with some speed...I cant even brake toque the truck to get it to move...after about a 100 feet or approx 15 mph the truck rockets...I do have a Dr. performance programmer, removed it, same problem just not as much top end...Turbo vanes work properly, very clean, very smooth...No black smoke...it acts like it is in a de-fueling mode or limp mode...

[jeeplj8]

is it revving at all? If so the problem may be transmission. If you are pressing the pedal to the floor and not much is happening that makes me think it is an issue in the electronic throttle.

[a2elvis]

Sounds like turbo vanes are stuck in the open position... Need to pull turbo to inspect.

[xmen]

Originally Posted by jeeplj8

is it revving at all? If so the problem may be transmission. If you are pressing the pedal to the floor and not much is happening that makes me think it is an issue in the electronic throttle.

I can press the petal to the floor and it will slowly start to move, very slowly until I reach about 1800 rpm's then it takes off strong...When I am driving on the highway and the rpm's are up, no problems, accelerates great...No bottom end at all.

[xmen]

Originally Posted by a2elvis

Sounds like turbo vanes are stuck in the open position... Need to pull turbo to inspect.

Had the turbo off last weekend and clean it, nice and shiny...I had the problem before I clean the turbo, no change...Is there a way to check if the vane's are functioning while on the vehicle?

[jeeplj8]

I would think you would see smoke with the vanes open. Easiest way to start it up and let it sit at idle and listen. You should here a soft whistle every once in a while. If you have an aftermarket exhaust it will be more pronounced. If your exhaust is constant at idle they are stuck.

There is an electric solenoid that opens and closes the vanes. It cycles full open to full close at idle to check function. note it is supposed to throw a code if it does not cycle.

[xmen]

Originally Posted by jeeplj8

I would think you would see smoke with the vanes open. Easiest way to start it up and let it sit at idle and listen. You should here a soft whistle every once in a while. If you have an aftermarket exhaust it will be more pronounced. If your exhaust is constant at idle they are stuck.

There is an electric solenoid that opens and closes the vanes. It cycles full open to full close at idle to check function. note it is supposed to throw a code if it does not cycle.

I don't hear the whistle sound, pretty constant...I cleaned the turbo per one of the threads on the forum, clean and shiny...what would stop them from functioning? it's possible they were the problem all along, what next?