Hard downshifting
Thread Starter
Instructor
Joined: Jul 2015
Posts: 177
Likes: 12
From: Allen Texas
Hard downshifting
For the past month or so when slowing down to a stop sign it feels like the car hard shifts into the lower gears (3rd, 2nd to 1st) and isn't smooth. Maybe it's trying to shift too soon into the lower gears.
I don't know if I need to get the TCM reset or just disconnecting the battery would help. It does have a tune (engine and trans) but it's never driven like this before. Why would this all of a sudden change shifting?
The tuner mentioned that the trans will "learn" the way I drive and adapts. I will sometimes paddle shift to slow down, but this is happening all the time now. Will it un-learn this if that's what happened?
Any thoughts?
I don't know if I need to get the TCM reset or just disconnecting the battery would help. It does have a tune (engine and trans) but it's never driven like this before. Why would this all of a sudden change shifting?
The tuner mentioned that the trans will "learn" the way I drive and adapts. I will sometimes paddle shift to slow down, but this is happening all the time now. Will it un-learn this if that's what happened?
Any thoughts?
Safety Car
Joined: Nov 1999
Posts: 4,285
Likes: 83
From: S.E. WI.
St. Jude Donor '08-'09-'10
I am not aware of what adjustments your tuner made to A8. I can tell you A8 tuning can also be some trial and error..
I attached a pdf that is designed to help address some of the driving/shifting issues by employing specific driving methods.
Do you have HP Tuner or is tuner close to you? Maybe consult with your tuner..
GL!
I attached a pdf that is designed to help address some of the driving/shifting issues by employing specific driving methods.
Do you have HP Tuner or is tuner close to you? Maybe consult with your tuner..
GL!
Thread Starter
Instructor
Joined: Jul 2015
Posts: 177
Likes: 12
From: Allen Texas
Thanks for that article!
It's just strange that it was perfect shifting, but then got worse and worse.
I don't have an HP Tuner so I guess I'll have to drive it to him to do a relearn.
So, I'm guessing that taking the battery off for a period of time wouldn't reset the TCM? I haven't tried that yet.
It's just strange that it was perfect shifting, but then got worse and worse.
I don't have an HP Tuner so I guess I'll have to drive it to him to do a relearn.
So, I'm guessing that taking the battery off for a period of time wouldn't reset the TCM? I haven't tried that yet.
Thread Starter
Instructor
Joined: Jul 2015
Posts: 177
Likes: 12
From: Allen Texas
My tuner did a re-learn for me and within 5 mins of driving, it was all back to normal. I didn't realize that it would learn my habits over time. Apparently I was paddle downshifting too often and it learned that "oh, you want to drive that way? I'll help you." I knew that if I drove hard for a few minutes it understood that that's the way I wanted to drive, but I didn't realize that also driving a certain way over a longer period also kept that pattern in memory.
