I had some isues with the truck last fall and they did a reflash while they had it and now when I let of fthe throttle it has a bit of a pause before the engine actualy does what my foot did. I only notice it if I was just in the throttle a little bit(time wise). Its anoying and almost not safe. I have had it a bunch of times and even in trafic if I have to get on it to get in a hole then back off to keep from running someone over. I realy have to get on the breaks to overpower the engine till it decides to back off the throttle. I figured it out when I was playing in the snow and wanted to lide the rear end around. When I had it sliding like I wanted I let off and the truck just kept going till the engine actualy backed off. It dont do it if I have been driving or any normal easy operations only if I stab the throttle for a breif second or two for a boost of power. Any one else have this isue?? Is there a fix for it???

 

It is going to sound stupid, but do you have a floor mat under the petal? I had the same thing happen to me once and that was the culprit. Also, how many miles are on your truck, maybe your apps might be going bad.

 

Your truck doesn't have any aftermarket fueling?

 

I believe what's happening is caused because these trucks are "computer" controlled and not cable controlled like they were in the past. My truck does it some and my nephew's 04 does it even worse than mine. Mine has a real delay if I stab the throttle hard, it takes several seconds (about 2-3) for the fuel to burn for the turbo to spool and the reaction of me lifting off the throttle to all take place....I've had to learn NOT to "stab" without having adaquate space for the truck to respond to my commands.....does that help?
It really scared me the first time it happened, I was used to having to really mat the throttle in my old truck (power-stroke) to get it moving, then I bought this CTD and had to relearn how to apply the power...

 

I agree with TNLoneWolf on the computer controlled throttle. I first had this experince trying to get out in traffic and almost hit the car I was trying to get in front of in the side. Next time I guess I'll not be as impatient and just wait.

 

i heard that it doesnt imediately let off to prevent turbo bark.

 

Just my 2 sents here but it does sound like a TPS issue. THrottle Position Sensor. Our trucks don't have throttle cables as mentioned above. I have heard you can recalibrate the TPS. SOmething about disconnecting both batteries, re connect, Turn the Key to ON but do not start the truck, press the throttle pedal down three full times, turn truck off, then start. Not sure on the steps, but maybe make a seperate post called " TPS calibration steps" or something.

 

When it was in getting reflashed last fall I was standing rite there waching because I know the tech that was doiong it, and I was waching the screen of the computer while it was downloading all the stuff to my truck and one of the things that came across the screen was turbo and cluch safety or something to that extent. I figure it was probobly the culprit. Most likely designed to prevent turbo bark as stated above. I have learned to live with it but I was just wondering if anyone else had this isue or not. Sounds to me like Ime not the only one.

 

its fun in the snow, you need to get used to it happening

 

Exactly. It is normal and most noticeable when you are on the throttle and have to let off suddenly. It protects the turbo, and potentially the head/gasket/valves from excessive backpressure due to the turbo bark.

 

Mine does not do that. I have never been flashed though. My truck is a May 06 build.

 

Mine does this real bad and I have posted this before but no one seems to know how to fix the issue. I think its very unsafe, as I mentioned in my other post concerning this, I have almost had accidents because of this problem. Has anyone ask the dealer to fix this?
Other computer controlled diesels do not do this.

 

mine does it too, I just live with it and keep a little distance from other vehicles. does anyone know if the 6.7's do it too since they have a throttle body?

 

Its the nature of the beast you drive. Diesel engines don't react like a gas engine does when letting off the go pedal, it takes a second or two before it starts slow down. As stated above our trucks are drive by wire/computer and not linkage like in the old days.

JMHO

 

I think almost all of the newer trucks do it under the right conditions. There's no way it's by design though. I can't imagine DC's lawyers would allow that to happen just to prevent turbo bark.

IMO it's caused by the high pressure common rail system. You stab the throttle and the rail gets pressurized higher, then when you let off quickly the fuel/pressure has nowhere to go. This would make sense since the older trucks don't do it.