[Xfire1000]

While cruising at 55-60 MPH if I let off the pedal slightly-not all the way- and then depress the pedal normally to speed up, the truck shudders for a second and then all is fine. Is bad enough the passengers can notice it. Actually shakes the truck fairly good.

If you let off the pedal fully and then depress it this never happens. I need to be a straight level road and can duplicate the problem.

Engine RPM's do not drop of fluctuate. Does not seem like the torque converter is unlocking and locking, but possible.

Took it to the dealership and they could not duplicate it. They updated the trans controller and the problem is still present. I'm sure I will need to drive the truck for them to make it happen.

Curious if anyone else has experienced this or knows what it might be?

 

[Xfire1000]

I have the latest flash. Truck was just at the dealership Tuesday. Problem still present. If anything it is worse than before.

 

[Xfire1000]

This is when warm running at 35-40 MPH and 55-65 MPH without the EB on. If the EB is turned on it gets way worse.

With just a slight lift off the accelerator and then back on it shudders enough to make the truck jerk.

No drop in RPM seen, no CEL or warnings at all.

I thought about driveline wind up but this never happens if you lift off the accel completely. You need to be in between accelerating and coasting but not fully lifted.

 

[Xfire1000]

I would be OK with this is it was only when cold but this happens all the time whether cold or up to full operating temperature. I can make it happen at will.

I am going to take it to another dealer after the weekend-and test drive it with them so I can show them what happens. I get tired of the "could not duplicate the problem" BS from the dealers.

 

[Xfire1000]

I am not sure on what the dealer installed as they did not put any stickers/labels for what is installed. I am assuming it is the latest flash for the ECM and transmission controller as I got the truck back this week.

Truck is completely stock with no performance tuner.

 

[Xfire1000]

Drove the truck 700 miles over the last several days after I got it back from the dealer. It is way worse now with the current flash.

It does at different speeds and different RPM. Even at 75 MPH on the freeway. It does seem like it is in the torque converter.

Engine RPM does not change when this occurs and will happen at 1200 RPM through 2000 RPM depending on the speed. Happens mostly in 6th gear but will happen at slower speeds in 3rd and 4th. I also think this is the same stumble or bog that happens occasionally at part throttle from a stop. It feels like the engine bogs but the RPM never fluctuates. Truck hesitates and then goes fine.

 

[Xfire1000]

TBOLDUC-Sometimes it is just a single skip like you described but depending on how back it happens it can be two or three skips/shudders and then it is fine.

The weird thing is that it does not happen if I let off the pedal completely. I have not taken it to another dealer yet. I need the truck so time is always an issue. I will try to get it in next week and test drive it with the mechanic so I don't get another "Could not duplicate". I like it when they dealers say that!!

It has gotten to the point that I can tell when it is going to happen and how bad.

 

[Xfire1000]

Took the truck into the dealer this morning. I requested to have the technician drive with me-no more Could Not Duplicate BS. I was able to make it happen several times while driving. Tech initially thinks it may be the torque converter but they need to do some testing. I will update this when I get any new information.

 

[Xfire1000]

I am starting to lose my mind and patience.

Now I mentioned earlier that I drove it with the technician on the 15th in the morning and that I was able to show them what the truck does. They called me back that night and said they Could Not Duplicate it and I could pick up the truck.

I said it happened that morning with the tech--how can you say Could Not Duplicate?? They said they were unable to make it happen when they drove it and could not find anything wrong.

So I go back there this morning and drive the truck with the tech and the Service Manager. I was able to make it shudder but they still did not pick up on anything that is wrong with the Star Scan tool. They still have the truck and are going to drive it again.

I like stealerships.

I think it may be time to disconnect the EGR if they call and say they Could Not Duplicate it again. This is becoming my favorite saying.

 

[Xfire1000]

The latest information from the dealership is that it is the way I am driving the truck (using the throttle).

The tech recorded various parameters while this occurs and sent it off the Chrysler to see if there is anything wrong...Nothing wrong with the readings.

The thing I want to know is if it is the way I am using the throttle how come it happens with the cruise control on?

Just another stressful day with the dealership.

Sorry for the rant. Needed to vent a little...Sounds like a Coors Light commercial.

 

[Xfire1000]

It will do it in 4th through 6th gears that I have noticed. I am beginning to think this is more engine/fueling related than transmission related.

The Service Manager is supposed to call me tomorrow. I will see what kind of BS he will try to feed me.

 

[Xfire1000]

4th gear in my truck is a very soft shift. All other gears you can feel a positive clutch engagement. 4th feels different than all the other gears upshifting and downshifting. I asked the dealer about this before and was told this is normal for this gear. I have nothing to compare to so maybe that is the way it is. It holds the power but just doesn't feel right.

 

[Xfire1000]

Well, I pick up my truck from the dealership on Friday and the technician gave me a very good explanation of the problem. My truck is operating as designed (According to Chrysler). The issue is at the point of a slight tip-out and then tip-in of the throttle, the VGT and EGR valve are operating and because I don't let off the throttle completely, the ECM is getting confused and does not know how to respond causing a possible vacuum in the intake. The vacuum is what is causing the shudder through all the driveline. There is NO fix for this at this time. The tech did not know if Chrysler is even working on anything and this is not a wide spread complaint. Chrysler is aware of this issue with using the Cruise (mine also dos in with the Cruise on) but he also did not know if anything is being worked on.

I unplugged the EGR valve and no more shudder. The truck is more responsive and have already gained one MPG is 40 miles on the overhead (mine seems to read pretty accurately).