A8 shutter question
11-20-2018, 06:02 PM
#1
Drifting
Thread Starter
A8 shutter question
I have a 19 GS A8. 5600 miles. I was driving on the freeway and hit an incline. I lugged the car slightly. Not bad though. I felt something odd. The car surged about 6 times. I watched the tach. It rose and fell 100 rpm’s. Is that the A8 shutter? It only did it that one time. Thanks for the feedback.
11-20-2018, 07:14 PM
#2
I have a 19 GS A8. 5600 miles. I was driving on the freeway and hit an incline. I lugged the car slightly. Not bad though. I felt something odd. The car surged about 6 times. I watched the tach. It rose and fell 100 rpm’s. Is that the A8 shutter? It only did it that one time. Thanks for the feedback.
11-21-2018, 01:38 PM
#3
Mine was doing it at lower and higher speeds. My dealer service dept told me there is a factory bulletin on this and that the first thing they try is a trans service. Flush the trans and converter. They said if that doesn't work there is a new converter coming out in 1st quarter of 19 to fix it. After they serviced mine it went to barely noticeable at all but sometimes a little bit. If what they say about the fix in 19 is true I will get that done if it is doing it at all
11-21-2018, 09:13 PM
#4
Mine was doing it at lower and higher speeds. My dealer service dept told me there is a factory bulletin on this and that the first thing they try is a trans service. Flush the trans and converter. They said if that doesn't work there is a new converter coming out in 1st quarter of 19 to fix it. After they serviced mine it went to barely noticeable at all but sometimes a little bit. If what they say about the fix in 19 is true I will get that done if it is doing it at all
11-21-2018, 11:10 PM
#5
Drifting
Thread Starter
What is interesting about this TSB#16-N-175 you alluded to is that they specify a test to determine if the Torque Converter Clutch is the problem. This test is only conducted in "Eco Mode Only". If the vehicle does not pass the test then the transmission flush is recommended. The TSB doesn't say what to do if they conclude the torque converter clutch is not the problem. Presumably they are replacing the torque converters if under warranty. You would think that everyone should take heed and purchase a Range Tech AFM disabler to disable "Eco Mode".
11-21-2018, 11:18 PM
#6
the TSB implies that this condition only occurs in V4 ECO mode. It suggests, if you read between the lines, when this shudder does occur (it is only in ECO Mode" It doesn't imply it happens to everyone.
Last edited by MMD; 11-21-2018 at 11:26 PM.
11-22-2018, 12:51 AM
#7
Drifting
Thread Starter
Oh man. I think I was in eco mode. Long uphill and lugging. Well, I guess the answer is to simply hall ***! Lol. The C6 Z had the valves that fell out and the C7 has the transmission. My C5 was flawless. Oh well. Thanks for the info.
Last edited by vetten76; 11-22-2018 at 12:52 AM. Reason: Spelling
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DonBC6 (02-05-2019)
11-23-2018, 12:24 AM
#8
Melting Slicks
That is how my 17 GS behaved. Certain speed, certain load and the trans controller would lock and unlock the TC. It will destroy itself if it keeps doing that for long. You need to intervene and change speed, change load, shift to M, use range or get a tune.
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vetten76 (02-05-2019)
11-27-2018, 01:06 AM
#10
Melting Slicks
Congrats. There are some other threads on this topic if you want more info. Seems the trans is tuned to lock the clutch as often as possible and then pulse locking and unlocking to smooth out the transition and improve economy. The V4 mode adds more pulsing of the clutch. My theory is it is needed to regulate load and keep the engine in V4 longer.
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vetten76 (11-27-2018)
The following users liked this post:
vetten76 (02-05-2019)
02-05-2019, 11:42 PM
#12
Drifting
Thread Starter
[QUOTE=1999 White C5 Coupe;1598825083]This is great thanks. My problem now is that I really like the Range thing that keeps it on all 8. The car drives so much better. Gas mileage dropped a little, but it’s still good. Thanks for the fix link.
02-07-2019, 05:22 PM
#13
Pro
Member Since: Jul 2016
Location: N. San Diego-Fallbrook California
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Here is the fix: https://gm-techlink.com/?p=11127
03-05-2019, 07:18 PM
#14
Heel & Toe
I have a 2016 C-7 (Z51) and at 4500 miles had the torque converter replaced. It was doing just fine until the other day when the Stutters came back and also it feels like someone is hitting the car from behind every now and then. It doesn't matter what speed 35 - 80 so I'm now getting my second torque converter at 23000 miles. I sure hope this is the last time. I drive mostly in tour mode.
