Slow Turbo Spool-up

[MJWenrich]

I posted a question on the end of an earlier thread re: the lag in acceleration off the line with the Aison trans. I did not get an answer likely due to it being an old thread. Crabjoe and Jarod mentioned they had this problem as well and I would like to know if they have found an answer. To add to this question, I checked with a dealer service writer and they had not heard of the problem but looked for a TSB. The only one found was 18-052-13, I believe a turbo sensor, which would also be connected with Code P226C. I am not throwing a code but have the slow acceleration problem. The earlier thread mentioned 18-018-13 and I do not know what that one relates to.

If anyone has information on this I would like to know before taking it in to the dealer. The lag is a little better as the engine breaks in. I have about 500 miles on it now. But it still is definitely a lag and when I get back in my 2000.4, I realize how bad the lag is. That CTD takes off with very little throttle.

No problem with this truck when up at speed. It really has the HP needed to tow and get around the slow moving objects. Thanks for any help on this. If I do not get a response I will try the private message route.

Mike

 

[Wingate]

you may be experiencing the same thing I am with my new 14 model. I do not think its actually an issue, but I feel as though I am more "disconnected" from the truck than with my 06 model.
Really an odd feeling that I dont hear or really feel the truck accellerating like the 06, and I seem to ahve to push the throttle more initially... but what i have started noticing more and more is that the Aisin has a VERY short 1st gear, and thats contributing to what I perceive as the sluggish feel. I only have 500 miles on it so far, so Ive been experimenting with altering my driving style on take off to see if its different.

 

[JLandry]

...my new 14 model.

Isn't your signature due for a refresh so we can see what you have?

John L.

 

[Wingate]

there we go..

 

[Mawvelous]

I have seen some concerns with this on the 2013 & later trucks. It may be partially due to the 3:54 axles. There is a couple of throttle boosters on the market that may help. One is from BD Diesel, the other is from Sprint. They run about 230 to 290 dollars. Try both install inline to the throttle position sensor.

 

[JLandry]

Mike,

Can you please confirm the exact symptoms again for us?

Some examples...

You depress the accelerator pedal, engine rpm is immediately increasing, but for a moment the truck doesn't move.

vs.

The engine rpm doesn't initially respond for a brief moment when depressing the accelerator pedal.

vs.

The engine rpm responds immediately when pressing the accelerator pedal, but seems limited to a certain rpm for a brief moment.

Also...

Have you been able to correlate this behavior to certain engine or outside air temperatures?

Was the exhaust brake on?

Best regards,

John L.

 

[TCDiesel]

Do a search on TQ MGNT, Many reason to have this, I 1st encounter this in Class 5 and up trucks back in 2005, it just takes some getting use too, Most people Race form stop light to stop light, This behavior in Diesel creates soot which in turns waste fuel with increase Active Regens , Once you master the pedal it won't be a problem. You have to be careful at intersection crossing's BC it seem the truck will not move and the other drivers expect to get the heck out of the way BC of the Dart driving they practice.

 

[MJWenrich]

John...No on the exhaust brake. I have not yet figured out how to turn it on. No on the temperature. Happens regardless. Truck moves, but slowly accelerates. Kinda feels like you are towing or have an anchor on rear.

It can best be described as a lag where you depress the throttle and you have to keep giving it more and more pedal to go forward normally. You are moving and the engine is increasing rpm but it's slow as opposed to my earlier truck. When making a turn into traffic, I give it more and more throttle and then can hear the rear tire start to break loose as the turbo catches up. This all takes place in about two to three seconds. I am giving oncoming traffic a lot more lead time now because of this hesitation. If I was towing, and the problem was worse because of that, it could be a much larger issue.

I have not hammered the pedal off the line because of the low mileage so far and do not know if that would make a difference but the way it reacts, I don't think it will. I'm pretty sure the lag will be there. When I had the boost gauge up on the EVIC, it shows 0 boost until the lag goes away.

Since I drove another truck that did not have this issue and was equipped the same, I have to believe it is something affecting this truck and maybe others built around the same time. I do not notice a lag when up at speed but most of my driving is in foothills and then very slow speeds when coming into town. Hope this explains it better.

Mike

 

[Wingate]

hhmm.. im going to have to scroll to to my boost screen and watch it while I drive..

 

[JLandry]

...which would also be connected with Code P226C. I am not throwing a code but have the slow acceleration problem.

Mike,

When you say you're not throwing a code, do you mean you've checked for DTC's (Diagnostic Trouble Codes) and not found any, or you've simply not seen the MIL (Malfunction Indicator Light) illuminate?

John L.

 

[JLandry]

...I have to believe it is something affecting this truck and maybe others built around the same time.

Just curious, what month/year was the truck built?

John L.

 

[slingshot383]

Sounds like your throttle position sensor isn't matching your throttle pedal inputs. No help from the deal with this issue?

 

[MJWenrich]

Just curious, what month/year was the truck built?

John L.

Sept. 2013.

 

[JLandry]

Mike,

Based on my limited experience with my truck which is similar to yours, the symptoms you're describing definitely don't sound normal. There's absolutely no lag when pressing the accelerator pedal on my truck... none!

If I were you I think I'd be camped out at a dealership. If they can't figure this problem out, then I'd insist they get help from Chrysler. You paid way too much for your truck to be putting up with this!

John L.

 

[mpaulson]

Mine is like that as well. If you turn off the traction control, you get a much more responsive start. These things have so much power now you'd be chirping tires all the time easily without the traction control and no load on the rear tires. I spin quite easily with the TC off. As already mentioned, the first gear is really low and there for you have a really quick shift happening as soon as you start to move, so this causes some of the delay. I've made a habit of hitting the full on E-brake and the TC button every time I get into the truck now.

 

[MJWenrich]

Trying not to sound too ignorant here but what/where is the traction control feature and as i mentioned in an earlier post, I have not learned how to use the exhaust brake. I believe I am about halfway thru the 9 week course on learning how to use this truck. And for some reason, an earlier answer to a question did not post. When I was at the dealer, I only inquired if there were and TSB's on this issue. I am trying to go armed with information. I really do not want them messing with the truck other than this problem.

And to mpaulson, I drove an almost exact truck, except for the bed length and color, did not have this lag so I have to believe there is an issue other than how I am starting off with it. But I still want to know about the traction control you mention. Is that another term for 4 wheel drive? Nothing would surprise me at this point re: the features on this truck. I drove the 2004.5 today just to clear my head.

Mike

 

[JLandry]

Trying not to sound too ignorant here but what/where is the traction control feature and as i mentioned in an earlier post...

Mike,

The TCS (Traction Control System) is subset of the ESC (Electronic Stability Control) system.

The button to control the ESC is located in the row of switches below the uConnect system.

Here are a couple of pictures I captured from the owner's manual and should give a rough idea of what to look for. The button has an icon of a skidding vehicle with the word "OFF" below the icon. I circled the examples in red.

The ESC has three modes...

ON (the default): Enhanced vehicle stability, engine power reduction, traction control, and torque management are all enabled.
Partial OFF: Enhanced vehicle stability is reduced, engine power reduction is disabled, and traction control is disabled. Torque management is still enabled.
Full OFF: All features are disabled.

To select Partial OFF, momentarily press the ESC button at any time.
To select Full OFF, press and hold the ESC button for 5 seconds WITH THE VEHICLE STOPPED and the engine running.

NOTE: Full OFF mode will revert to Partial OFF mode when the vehicle speed reaches 40 mph. When the vehicle speed drops below 35 mph, Full OFF mode will reenable.

See the ESC section of your owner's manual for more details.

Best regards,

John L.

 

[mpaulson]

Huh, didn't know that JLandry! thanks, I'll have to play with that in the morning. Thanks for the lesson.

 

[MJWenrich]

Okay. Tried it with the traction control off and no difference. Been busy and have gotten back to the manual so I cannot comment yet on the exhaust brake activation. When I learn how to activate that, I will try both and put it in tow/haul and see if that makes a difference. Short of that being successful I will be camping out at the dealer I guess trying to get them to find something. I just do not have the time right now to do that so a future post may have an update on this issue. Thanks to all for the info though.

Mike

 

[Sticks]

Exhaust brake should be in the same row of buttons as the traction control. It will literally look like a "Fart" button.

Your dash may or may not look like that, but the icons on the buttons are an internationally universal standard. Thank you McDondalds.