Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Think I figured out the shuddering when starting from a stop...can't believe it
View Single Post
Old 10-03-2012, 09:08 AM   #7
Focus Enthusiast
Join Date: Nov 2011
Fan#: 91903
Location: Annapolis, MD
What I Drive: 2012 C.Red Focus SE Sport Package

Posts: 249
Points 417, Level 8
Points: 417, Level: 8 Points: 417, Level: 8 Points: 417, Level: 8
Level Up 34% Completed
Level up: 34% Level up: 34% Level up: 34%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 4 gkirk Good Standing Member
Buy-Sell-Trade Rating: (0)
Originally Posted by hotleadsingerguy View Post
So I've had more issues with the shuddering than I could even explain, and it all started with the TSB for the transmission update. Since that point, it's shuddered mostly every time I start from a stop. It's obnoxious, and makes the car feel cheap and crappy when people are riding in it. I've had it in the shop probably 3-4 times for this issue and every time they've said "It's supposed to act like that" and that the computer displays no errors.

So what did I do today? Turned off Traction Control. The second I turned it off, the shuddering from a stop no longer happened. I drove my 15 minute commute to work without a *single* shudder. The shifts were smooth, the starts and stops were smooth, and even mashing the gas when going into a corner from a stop or slow roll didn't make the car buck around like it was having a stroke.

Turn it back on? And the shuddering happened the very next light. Turned it back off, and no more shuddering.

Is it possible that this issue is somehow related to the Traction Control module initiating when it doesn't need to? I have lighter wheels on the car than stock (Sparco Assetto 18), but didn't have an issue with this until the TSB update. The lighter wheels might fool the computer into thinking it's losing traction (since there's less friction and resistance on the drive shaft), but I really can't postulate an answer beyond that.

For those of you with "Shuddering" issues, please help me test this by just disabling the Traction Control and driving like you normally would. If it's gone (or at least severely reduced), post back and let me know. Maybe Ford needs to issue a recall for the *CORRECT* part in the car this time.
Could it be that with the wheel+tire combo you have, your call falls outside the diameter of wheel that the TC is expecting? My understanding is that the car expects a certain number of revolutions at a given speed, and if its not getting that number, the TC will start doing things.

I had a similar problem with my bimmer's traction control bc i had wheel+tires that were a bit too big (speedometer was off too).

It's just a thought.

Edit: Also the most recent flash for the DCT was also for the ABS/traction control. So maybe there is something at issue there.
gkirk is offline  
    Reply With Quote