Just picked up an 04 CTD, one thing that is weird is if i get on the throttle and leave off the truck still accelerates for a few seconds. its especially hard when pulling out in intersections and then you need to get off the pedal but the truck is still pulling. is this normal?

 

Yeah, my 03 did that too. I don't know if it is a matter of fuel rail pressure not dropping down immediately or what.

Mine only did it at high throttle.

 

My 03 auto kind of did that, it was very brief and only if I let off the pedal quickly.

 

You will get use to it.

 

mine dont anymore with new engine and injectors. its a sign of bad injectors. one thing you could do as a quick try is replace your FCA regulator for $150 but if that dont do it its 6 new stix time

 

That sounds like my 06. I posted on here about when I rev it up, it doesn't idle back down right away when you let off the accelerator. Glad to know it's not just mine.

 

It's generally considered normal. There are a few threads out there that explain it, but it is generally considered a safety to protect the turbo from barking. It feels like it is accelerating cause you expect it to slow down, but it is actually just coming down in RPM slowly to keep the intake side boost pressure from spinning the turbo in the wrong direction.

 

Yep, that is pretty much what it is. It is a slow ramp down of fueling to prevent airflow reversal on a sharp drop in throttle.

 

Sign of bad injectors? So they put bad injectors in them from the factory then.....yeah.

 

Mine did it with 20 miles on the OD so I guess it came with bad injectors.

 

Its because its drive by wire,no linkage hooked to the pedal like older vehicles.

 

from what ive read in the past it, it takes time for the fuel rail to release its pressure. Makes sense too me....id assume 25k psi would take a second or 2 to bleed off.

 

It's even more pronounced with a standard tranny - when you're running the RPM's up, just before a shift to the next gear, and some fool does something stupid in front of you, so you back off the throttle and hit the brakes rather than shift up - the rpm kind of hang there for a second or so . . it's even more delayed if you push in the clutch at a high rpm and don't shift up into the next gear . . hangs for even longer.

NORMAL.

My truck has done that since day one from new. It does take a little time for the rail pressure to come down. The guys that complain of turbo bark don't have this problem, but enough reversing stuff to the turbo and they will have other problems.



CD

 

With witty qualified statements like this, we will all be staying at the Holiday Inn Express....... There is a thing known as turbo spool and could be misdiagnosed as "throttle lag". As you press of the throttle (Gas pedal) it sends fuel into the combustion chamber (cylinder....sleeve...Jug). This is combined with air, which when compressed creates heat and then ENERGY. The product of energy is heat/exhaust which must pass the turbo. Until the fuel/air is reduced your rpm will hang. The beauty of a turbo-charged engine is that the energy must be expelled before the engine can reduce rpm/load. As the previous posters stated...this prevents turbo bark (compressor surge) and saves your turbo.

As an experiment you can sit in your garage and stab the throttle in Drive(once to the floor will do). As soon as you stab it, let off the brake and tell us how far you went before your truck stopped. This would be known as the IBSW test....

 

Drive by wire started in 05'. The 03-04.5' years have a throttle cable to the APPS. This is normal and not a sign of a bad injector. It takes a bit for the pressure to bleed off from the injectors. It is kinda aggrivating especially when some fool does something stupid in front of you just after taking off at a traffic light. A pressure box makes this even more pronounced and that is when most folks notice it.