speeds up in turns

[WKirk]

My Ram speeds up when taking turns in 4 wheel drive. The sharper the turn, the more it speeds up. It's more pronounced in right turns, and also happens when backing. The Ram is a 2006, 2500 SLT Mega Cab, six speed manual G56 transmission. The local dealer shop says that the engine mounts are okay. Any ideas? Thanks, WKirk

 

[NIsaacs]

It must be related to cab or engine movement. If the motor mounts are ok, it might be cab mounts or cracked frame.



Nick

 

[AH64ID]

How slow are you going, as in rpms?

The truck will auto fuel pretty hard at low rpms.

 

[cerberusiam]

It must be related to cab or engine movement. If the motor mounts are ok, it might be cab mounts or cracked frame.

Why? The engine could turn sidways or fall on the ground and it would never change rpm given everything stays connected.



First question, has it always done this or is the phenomenon new?



When you go into a hard turn in 4x4 a lot of drag is placed on the drvie train. The ECU is going to try to maintain idle speed against the drag and increase fuel which may speed the truck up some. Depending on the gear your in, you might see and feel some increase in the speed.



If the situation is new have the front axle joints check for bind on turning. They could be causing enough drag to trigger extra fueling.

 

[WKirk]

How slow are you going, as in rpms?

The truck will auto fuel pretty hard at low rpms.

I can't say in terms of RPM's. I have to go find some dirt and test that. In terms of speed it's less than 5MPH, although I suppose it could be true as higher speeds, I just don't take sharp turns fast. And in terms of gear, it would of course be low or second. But what is your thinking?

 

[WKirk]

Why? The engine could turn sidways or fall on the ground and it would never change rpm given everything stays connected.



First question, has it always done this or is the phenomenon new?



When you go into a hard turn in 4x4 a lot of drag is placed on the drvie train. The ECU is going to try to maintain idle speed against the drag and increase fuel which may speed the truck up some. Depending on the gear your in, you might see and feel some increase in the speed.



If the situation is new have the front axle joints check for bind on turning. They could be causing enough drag to trigger extra fueling.

It has done this since day one. I just never thought of this forum. In some regards it is probably a better trouble shooter than the shop. What is the ECU? There is a good deal of front axle binding during sharp turns in four wheel drive, I just though that it was the way the rig was made. I'll have the shop check it.

 

[WKirk]

It must be related to cab or engine movement. If the motor mounts are ok, it might be cab mounts or cracked frame.



Nick

I'll have them checked.

 

[Prairie Dog]

I think what your describing is totally normal and mine behaves in pretty much the same way. All 4 of your wheels are trying to turn at different speeds which is going to labor your eng down considerably as the tires grind into the ground surface. The computer will adjust idle speed back up after this laboring starts which results in the slightly increased speed.
In the old days of throttle cables and linkage, problem with eng to chassis alignment caused idle and throttle problems. All we have is a wire connecting us to the eng so as Cerb said, this cant cause anything like what your describing.

 

[NIsaacs]

Why? The engine could turn sidways or fall on the ground and it would never change rpm given everything stays connected.





Okay, you guys and your new stuff, no throttle cable I guess?? My 2nd gen has one



Nick

 

[Prairie Dog]

Why? The engine could turn sidways or fall on the ground and it would never change rpm given everything stays connected.





Okay, you guys and your new stuff, no throttle cable I guess?? My 2nd gen has one



Nick

Yup, the Common Rails throttles are all electronic (drive by wire) and when we push on the throttle, all we're really doing is turning up a glorified volume control like on your radio.

 

[AH64ID]

I think what your describing is totally normal and mine behaves in pretty much the same way. All 4 of your wheels are trying to turn at different speeds which is going to labor your eng down considerably as the tires grind into the ground surface. The computer will adjust idle speed back up after this laboring starts which results in the slightly increased speed.

In the old days of throttle cables and linkage, problem with eng to chassis alignment caused idle and throttle problems. All we have is a wire connecting us to the eng so as Cerb said, this cant cause anything like what your describing.

Exactly what I was getting at. My 05 does it, and so does my dad's 06. It takes some getting used to and paying attention to rpms before tight corners, because in 1st or 2nd gear I am not sure we have more braking hp than the truck has hp when your already moving.

 

[cerberusiam]

Yup, the Common Rails throttles are all electronic (drive by wire) and when we push on the throttle, all we're really doing is turning up a glorified volume control like on your radio.

Not all of them. True drive by wire did not appear until MY 05. The OP has an 06 so it is drive by wire.

 

[AEdelheit]

Not all of them. True drive by wire did not appear until MY 05. The OP has an 06 so it is drive by wire.

Eh depends how you look at it, in a way every truck after the 12v are drive by wire, the potentiometer is just mounted to the side of the engine and not

On the pedal, aside from a transmission kick down cable it's drive by wire

 

[cerberusiam]

Eh depends how you look at it, in a way every truck after the 12v are drive by wire, the potentiometer is just mounted to the side of the engine and not

On the pedal, aside from a transmission kick down cable it's drive by wire

True that is. However, in the context of physical connections to the engine then there is a difference. Depends on the context.

 

[hcole]

My 2002 has a APPS that is nothing more than a idle switch and potientometer mounted on the side of the engine. All 24vs are drive by wire and you are not going to choke it down to less than 875 rpms without the ecm trying to add more fuel to maintain that speed. It shows up on a manual transmission because there is no slip in the drivetrain. It will scare someone not familiar with the trucks.

 

[04blackcherry]

Mine "auto throttles" in traffic all the time when I lug it too much. Off road, it is a pain sometimes, when you want to creep in the next higher gear to avoid bouncing around on rough terrain.

 

[Prairie Dog]

I have a hard right uphill turn I have to take from a dead stop on the way home. The worst auto throttle episode I experience is on this turn when the inside tire slips in the rain and the throttle takes off and breaks both tires loose. I have to stab the clutch to stop it some times. Thing is, when this happens the ECM doesn't seem to be able to keep from over doing it when I lose traction. The freakin thing just seems to lose its mind sometimes.
I just know I'll be spotted by a cop some day and get a ticket.