Last post on May 27, 2011 at 4:22 PM
You are in the Buick LaCrosse
What is this discussion about?
Buick LaCrosse, Sedan
#6 of 134 Re: Hard Shift Jumps [bobinor]
Oct 31, 2010 (10:33 am)
I don't usually reply to my own posts but after Googling around a bit I found this interesting exchange link title in the Enclave section of the Buick threads in this town hall forum.
I would have thought that Buick would have corrected by now what is reported there in 2008 and 2009 model year vehicles. The descriptions of downshifting,etc. are very similar to what I have been experiencing. Has anyone with a 2010 LaCrosse had this issue corrected by a transmission recalibration?
I plan to do quite a bit of high altitude driving in my 2011 and would hate to be challenged by a balky transmission as has been reported by Enclave owners.
#7 of 134 Re: Hard Shift Jumps [bobinor]
Nov 01, 2010 (4:26 am)
I did experience what sounds the same on a 09 Malibu a few times. Slowly accelerating and just as I took foot off accelerator it upshifted and lurched a bit. Sort of like slamming into a higher gear before RPM had a chance to drop. It only happened a few times and then seemed to quit maybe because it needed breaking in.
But also the computer learns your driving technique,
The biggest tranny complaint on that vehicle seemed to be its downshift pattern from 6th gear. Many claimed it was dropping two gears at the same time and giving too much acceleration along with revs. For me, I believe it was only dropping one gear and releasing the TCC giving the feeling of a downshift of two gears. Also I learned the sweet spot on the accelerator that made the difference of just a downshift and a bit more accelerator to add the TCC release for more acceleration. Because of the complexity of a transmission, it only takes very minor differences during manufacture to make two identical transmissions behave differently.
I strongly recommend staying back behind other vehicles enough to overcome such a lurch. And then give it some time to see if break-in or driving habits alter the situation.
#8 of 134 Re: Hard Shift Jumps [bobinor]
Nov 01, 2010 (8:07 am)
Have you taken your vehicle in to the dealer? I would definitely recommend reading the owners manual 9-17 Breaking-In the vehicle. Please e-mail me with any questions you have. Thank you.
GM Customer Service
#9 of 134 Re: Vehicle rolls forward when I have shift in reverse [e_net_rider]
Nov 01, 2010 (10:43 am)
"....If someone tries trailering with this vehicle they will likely have very serious issue. "
As an owner of a camper and car trailer, I say that's what trucks are for.
#10 of 134 Re: Hard Shift Jumps [gmcustsvc]
Nov 01, 2010 (9:16 pm)
No, I think it is premature to visit the dealer for this. I need more experience with it as I still have less than 500 miles on it. I have been careful to not violate the 9-17 precautions but am going to find it difficult during my upcoming long road trip. At 68 mph top speed I fear I will be run over by big rigs. I'll just stay in the right lane with flashers on. But I will continue to monitor the transmission performance in the event it continues to act up and then I can report experiences to the dealer when I return, if necessary.
My post was to find out if others had similar issues and whether they may have been cured over time. That is until I found the thread about transmission problems in the Enclave.
#11 of 134 Re: Vehicle rolls forward when I have shift in reverse [cooterbfd]
Nov 02, 2010 (1:15 am)
I agree, but that don't mean someone won't try.
#12 of 134 Re: Hard Shift Jumps [bobinor]
Nov 02, 2010 (1:18 am)
Not too many years back, they said it was best not to drive at a constant speed for sustained periods during breakin. It does not state that, but it says not to drive faster than 68 for more than 10 minutes at a time. That statement could imply the prior.
#13 of 134 Re: Hard Shift Jumps [e_net_rider]
Nov 02, 2010 (7:06 pm)
Yeah, the break-in guides on 9-17 of the manual says >68 only for 5 minute spurts for less than 3000 miles, if over 600 miles. Maybe this is the purpose for the timer in the DIC. I'll have to use it on my trip. The constant speed precaution is for the first 500 miles - I'm almost there!
#14 of 134 Braking Pull
Nov 02, 2010 (7:30 pm)
I didn't see another thread but since the front wheels are at the end of the drivetrain I'll put it here. This is my first experience with low-profile, wide tires and I wonder if what happened today is due to them. It seems if there is any tilt to the road the car pulls in the direction of the tilt when braking. Now maybe my other cars did this to some slight extent but I really thought today it was exaggerated. I intentionally pulled into a flat parking lot and braked a few times at about the same speed and no pull. Are the wide wheels/tires (I have the GY RS-A 245/40R19's) influenced by the slant of the road more than say the 235/60R16's I had on my Regal?
#15 of 134 Re: Hard Shift Jumps [bobinor]
Nov 04, 2010 (3:22 am)
Thanks for correcting my time, 5 min instead of 10 minutes.
This vehicle has undoubtably the longest break in I've ever seen.
It also leaves open to interpretation just how often you can run faster than 68.
One minute at 67, then pedal to the metal for five?