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Old 01-04-2013, 01:50 AM   #1 (permalink)
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Jerky cruise control

Hi all!

I have a 2005 300C Hemi. I am leaving my car to the dealer on Thursday for a tranny service. The reason for this is that it has not been serviced before and i would like to see if it's OK. The shifting works and is smooth but i can't seem to find a pattern on how it shifts. Most of the time the shifting is smooth (very smooth actually) but once in a while it shifts a little bit harder and once in a while the shift seems a little bit delayed.

However, there are no error codes, no engine light, no audible beep, no clunking or bad noise. The EVIC says "System OK".

So, normally i would just await Thursday to get the tranny service but i have noticed something new. When using the cruise control and traveling on a straight road the car does small jerks once in a while. Maybe once per 30sec. This makes the ride un-smooth and is annoying. I would not care if i was traveling up and down a hill but this happens all the time the cruise control is active. I think it it most noticable between 30-45 mph but i think i also can feel it (altough less noticable) when driving 60mph. I am not sure if it's there in speed lower then 30 mph.

I did some googling and found several topics about this (not on Chryslers tough) and some of them says that it can be the tranny acting up and also be because of low oil level. Most seems to say cable fault or donor fault.

Since i am leaving it to the tech on thursday i am getting worried that i might wreck the tranny if driving it until thursday. Should i avoid driving my car? Have you noticed this jerky cruise control behavior?

The car has about 30 000 miles on it.

Thanks in advance!

EDIT: I should also add that sometimes i get a burnt brake/clutch kinda smell coming from the wheel-wells if that might be related to this. Most often the front driver side one. The smell is only there for a short period of time (it's gone after 2 minutes) and it does rarely happen. Haven't smelled anything in a couple of weeks now.

Last edited by Biffy; 01-04-2013 at 01:57 AM.
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Old 01-04-2013, 08:44 AM   #2 (permalink)
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When i drove home today i noticed that this happens even when not using the cruise control. It was however active, the yellow light was there.

Can it make a difference if it is active or not?
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Old 01-04-2013, 08:47 AM   #3 (permalink)
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Biffy, do you have any tunes on the car, say from a DiabloSport Predator tuner? Also, does the jerking happen at certain, predictable speeds only, or not? e.g. you notice it only and cruising speeds on the interstate, or in town at 35-45 mph, etc.


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Old 01-04-2013, 09:41 AM   #4 (permalink)
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Could it be that you're feeling the MDS system kicking in and out?
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Old 01-04-2013, 09:46 AM   #5 (permalink)
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Quote:
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Could it be that you're feeling the MDS system kicking in and out?
Will def feel the MDS engage with a custom tune on the machine.....


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Old 01-04-2013, 10:00 AM   #6 (permalink)
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Hi! No tunes at all. Everything is stock.

Yes, might be the MDS, im not sure how that feels. It is very slight and soft, feels like the car is accelerating slighty and sometimes braking.

The speed is always contained while in cruise control, but the RPM goes up or down 50-100 rpm. It happens maybe once every 30 sec.
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Old 01-04-2013, 10:03 AM   #7 (permalink)
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Don't forget to remove the DB tune before it goes into the dealers. Not sure if you tested your car with the tune removed to see if it made a difference?
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Old 01-04-2013, 10:16 AM   #8 (permalink)
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Quote:
Originally Posted by Biffy View Post
Hi! No tunes at all. Everything is stock.

Yes, might be the MDS, im not sure how that feels. It is very slight and soft, feels like the car is accelerating slighty and sometimes braking.

The speed is always contained while in cruise control, but the RPM goes up or down 50-100 rpm. It happens maybe once every 30 sec.
Well, before I put tunes on my ride, I had this issue...mild lurching, rpm needle would bob slightly. This went away after I had the tranny serviced...flush and filter change, drove it a while, etc.

Now, when I put a tune on, I def felt the MDS engage, which produced a similar lurch as described above, but I just used the tuner and shut the MDS off and this fixed it.


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Old 01-04-2013, 05:41 PM   #9 (permalink)
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Quote:
Originally Posted by therealfleen View Post
Well, before I put tunes on my ride, I had this issue...mild lurching, rpm needle would bob slightly. This went away after I had the tranny serviced...flush and filter change, drove it a while, etc.

Now, when I put a tune on, I def felt the MDS engage, which produced a similar lurch as described above, but I just used the tuner and shut the MDS off and this fixed it.


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Exactly my problem with the mild lurching and the rpm needle slighty bobbing. So you flushed the tranny and it went away but then came back with your mod. This would mean that the tranny flush was not the problem solution then? But since you turned the MDS off it went away?

It could def be the MDS since it only happens when driving the car on a steady speed. The car is a 2005, could a software update solve this or might someting actually be broken?

Thanks for your replies thus far.
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Old 01-04-2013, 05:54 PM   #10 (permalink)
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I'd say have the service done on the tranny and go give it a good drive to really heat it up and see what happens.

My two lurching issues were separate. The tranny service definitely fixed my first lurch issue and the second lurch issue was more due to the fact that I had older software on my tuner...there was an update for it that "smoothed" out the mds issue, but I never downloaded it. I just turned off the mds instead.

Keep us posted!


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