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  1. #31
    Member ronjohn11's Avatar
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    2015 - 2017 Corvette: Shake and/or Shudder During Light Throttle Between 25 and 80 mp

    Currently have 7,751. I need about 20 more miles to complete the recommended requirement. I'm not that technical but I think my dealer has done the steps specified in the TSB. Now I am waiting on the dealer to call me when he gets the parts. My dealer did the road test with the PICO scope(???) and flushed the tranny according to TSB 16-NA-175.
    Last edited by ronjohn11; 08-10-2017 at 06:06 PM.
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    Torque converter shudder

    elegant, rdslon01, and vetstings, thanks for your responses. I will, most definitely, follow your suggestions. I bought my vette from Stingray but didn't want to drive it that far. Autonation was recommended by several vette owners so they have the first shot. When I took it in they seemed o know it was the TC. It was confirmed by the PICO test. I sure hope they are right.
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    Junior Member ken1017's Avatar
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    Well, get this: they finally decided to replace the TC but in doing so, the tranny fell off the cradle it was supported on, so I got a 'new' tranny because they cracked the housing. Not sure how 'new' as it does not shift correctly. When cold or when accelerating quickly, the engine speeds up but does not go into the next gear right away. Then when it does engage you get a good jolt. First vette was a 63, I think this is my last. Love the car, hate the service and the run-around. Have had other issues, they tell me that they needed to reflash the memory, which does not work,. A sad ending to fun times.
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    Senior Member rmorin49's Avatar
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    Quote Originally Posted by ken1017 View Post
    Well, get this: they finally decided to replace the TC but in doing so, the tranny fell off the cradle it was supported on, so I got a 'new' tranny because they cracked the housing. Not sure how 'new' as it does not shift correctly. When cold or when accelerating quickly, the engine speeds up but does not go into the next gear right away. Then when it does engage you get a good jolt. First vette was a 63, I think this is my last. Love the car, hate the service and the run-around. Have had other issues, they tell me that they needed to reflash the memory, which does not work,. A sad ending to fun times.
    I feel your pain, ken. I am also disappointed with my first and maybe my only Corvette. Reliability has been poor and GM's attitude leaves a lot to be desired. My car was in the shop for over 30 days with fuel delivery and tranny issues. I've never experienced this with any car I have owned in my life. Hopefully your tranny will improve as it "learns". Good luck, my friend.
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    Senior Member West Ham Utd's Avatar
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    It would appear our C7 has developed this issue at approx. 8,200 miles. Many thanks for posting this TSB , as it will make things easier when I take the car in.
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    I took the car in two weeks ago for the shudder and rpm fluctuation problems. The tech and I took it for a test run and it shuddered and the rpm fluctuated. I was in the passenger seat and was able to observe that the fluctuation corresponded with the shudder. I left the car for diagnostics, expecting that the triple flush of the torque converter would be the solution. Not so. Bowling Green told them the torque converter was the problem and to replace it. That is major surgery as the rear bumper is removed and the rear drivetrain is completely removed and put on a bench. Not only does the car now have a new torque converter, it also has new bolts to hold it together and a new cable running to the gear shifter. I suspect the torque converter is a new vintage, i.e. part number. The tech drove it for 50 miles to check it out and all went well. I have it back and it is running better than ever. Thanks to the team at Parks Chevrolet of Augusta for solving the mystery.
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    I took the car in two weeks ago for the shudder and rpm fluctuation problems. The tech and I took it for a test run and it shuddered and the rpm fluctuated. I was in the passenger seat and was able to observe that the fluctuation corresponded with the shudder. I left the car for diagnostics, expecting that the triple flush of the torque converter would be the solution. Not so. Bowling Green told them the torque converter was the problem and to replace it. That is major surgery as the rear bumper is removed and the rear drivetrain is completely removed and put on a bench. Not only does the car now have a new torque converter, it also has new bolts to hold it together and a new cable running to the gear shifter. I suspect the torque converter is a new vintage, i.e. part number. The tech drove it for 50 miles to check it out and all went well. I have it back and it is running better than ever. Thanks to the team at Parks Chevrolet of Augusta for solving the mystery.

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    Senior Member Busa Dave's Avatar
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    I am going to change/flush my tranny fluid next month. THIS is handy and timely will advise I want this TSB performed to make sure all of the GM fluid is gone then add my Amsoil.

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    Senior Member West Ham Utd's Avatar
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    Update :

    Got the car back last night, after having the transmission flushed as per 16-NA-175. Had a quick chat with the Tech ( wanted to make sure he got a few $ as gratitude) & he said to drive at least 300 miles before deciding if the car needed further work or diagnostics.
    It could be my imagination, but the C7 seemed to shift much slicker in manual mode on the drive home & I didn't experience any tell- tale shudders. Too early to say it's fixed, but quietly confident that the fluid change might be all that is needed for this C7.
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    UPDATE: Got my C7 back the other day with a new TC. The ride home was much smother with the new TC. I don't really know if I got a redesigned TC or just not another TC. If it was just another TC I expect the terrible shutter to reappear in another 7,000 to 8,000 miles. I'm probably a little paranoid having the shutter demon because every little road vibration makes me think the shutter demon is raring its ugly head. It's pretty hard driving with my finger crossed hoping I never feel that demons presence the rest of my life.
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    Quote Originally Posted by ronjohn11 View Post
    UPDATE: Got my C7 back the other day with a new TC. The ride home was much smother with the new TC. Driving with my finger crossed hoping I never feel that shutter demons presence again.
    Glad it is fixed, and we all hope you never experience it again!
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    Junior Member Gtalley's Avatar
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    Did you get a new TC or a whole new trannie? I just had mine in and they did the flush thing. A title better but not fixed. I am callin them tomorrow to let them know and push for anew TC or trannie. Do you know if these new parts are redesigned or just a different same type? Thanks

    Greg

    UPDATE. I got my car back a few days ago after having the TC replaced. I haven't driven it much but the shudder problem appears to be gone. I hit the sweet spot for the shudder (1300-1500 rpm) and it was as smooth as silk. The car seems to drive much smoother. No rattles or anything either after having the back end off to replace the TC. So far I am a very happy camper. I will get some more miles on it to be sure. BTW the dealer (Lindsay Chevrolet in Woodbridge Va) did an amazing job and keep me posted all along the way. When I picked mine up he told me there were 6 others in line to have the TC replaced. He also read somewhere that approx. 30% of the vets out there have this problem. Good luck to all going through this.

    Greg
    Last edited by Gtalley; 10-30-2017 at 11:51 AM.

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    Senior Member West Ham Utd's Avatar
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    Quote Originally Posted by Gtalley View Post
    Did you get a new TC or a whole new trannie? I just had mine in and they did the flush thing. A title better but not fixed. I am callin them tomorrow to let them know and push for anew TC or trannie. Do you know if these new parts are redesigned or just a different same type? Thanks

    Greg

    You might not feel the full effects of the TSB flush for 300 miles or so, as it takes time for new fluid to do it's thing. As for a new TC or transmission, it is my understanding that the fluid flush is successful the vast majority of the time & very few TCs need replaced. I think it is more an issue of the original fluid not getting removed from the TC (easier said than done) & the new fluid not being able to replace it & that is why only some TC need replaced.
    I read your other post about the shudder & not 100% sure you have the same issue, as you are not getting the shudder in V8 mode. The TSB states the shudder is apparent in V4 & V8 modes- this was definitely the case with our car.

    We are still actually ongoing with this TSB. the initial flush seemed to solve the issue, but then the transmission pan gasket developed a slow leak (probably from being removed so many times during flush procedure). The gasket was replaced, but in an honest error, the old style fluid was added back into the transmission- I just happened to spot it on the work order. The car is going back in tomorrow, to have a second TSB flush procedure done as well as having a new transmission filter & pan gasket (GM really needs to add that info to the TSB IMO). Hopefully, that will be this issue finally solved for our car. HTH & best of luck getting your C7 sorted.
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    Senior Member joemessman's Avatar
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    Quote Originally Posted by West Ham Utd View Post
    You might not feel the full effects of the TSB flush for 300 miles or so, as it takes time for new fluid to do it's thing. As for a new TC or transmission, it is my understanding that the fluid flush is successful the vast majority of the time & very few TCs need replaced. I think it is more an issue of the original fluid not getting removed from the TC (easier said than done) & the new fluid not being able to replace it & that is why only some TC need replaced.
    I read your other post about the shudder & not 100% sure you have the same issue, as you are not getting the shudder in V8 mode. The TSB states the shudder is apparent in V4 & V8 modes- this was definitely the case with our car.

    We are still actually ongoing with this TSB. the initial flush seemed to solve the issue, but then the transmission pan gasket developed a slow leak (probably from being removed so many times during flush procedure). The gasket was replaced, but in an honest error, the old style fluid was added back into the transmission- I just happened to spot it on the work order. The car is going back in tomorrow, to have a second TSB flush procedure done as well as having a new transmission filter & pan gasket (GM really needs to add that info to the TSB IMO). Hopefully, that will be this issue finally solved for our car. HTH & best of luck getting your C7 sorted.
    That really must be frustrating! Hope they get it right this time. I would be beside myself.
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    Senior Member West Ham Utd's Avatar
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    Thanks, but things can & do go wrong, so I'm not too concerned. It was an honest mix up & the Dealership is being really good about it. Hopefully it all goes well tomorrow, but I'm going to meet with the Tech beforehand to make sure we are on the same page.
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