Vehicle shudders when decelerating from 60 mph
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Cruising
Joined: Dec 2009
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Vehicle shudders when decelerating from 60 mph
I have noticed that my 2009 corvette coupe shudders once it comes back to 60 mph. I'll be driving along 65-70 mph on the highway and when I slow down, the engine briefly shudders once it reaches 60 mph. What would be causing that to occur? I have not noticed this activity at any other interval. Thanks for your help, Dave
Melting Slicks
Joined: Dec 2008
Posts: 2,296
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I have noticed that my 2009 corvette coupe shudders once it comes back to 60 mph. I'll be driving along 65-70 mph on the highway and when I slow down, the engine briefly shudders once it reaches 60 mph. What would be causing that to occur? I have not noticed this activity at any other interval. Thanks for your help, Dave
1st was a toyota celica, turned out the brake rotors were warped pretty bad
2nd was a mitsubishi eclipse and the torque converter was going bad/out of balance.
Either way, since it's an 09 you should definitely still have your warranty and the dealership should be able to fix it
Melting Slicks
Joined: Oct 2010
Posts: 2,314
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From: Cape May, NJ; Guntersville, AL; Orange Beach, AL
My guesses based on 2 of my friends cars having similar issues...
1st was a toyota celica, turned out the brake rotors were warped pretty bad
2nd was a mitsubishi eclipse and the torque converter was going bad/out of balance.
Either way, since it's an 09 you should definitely still have your warranty and the dealership should be able to fix it
1st was a toyota celica, turned out the brake rotors were warped pretty bad
2nd was a mitsubishi eclipse and the torque converter was going bad/out of balance.
Either way, since it's an 09 you should definitely still have your warranty and the dealership should be able to fix it
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
I have noticed that my 2009 corvette coupe shudders once it comes back to 60 mph. I'll be driving along 65-70 mph on the highway and when I slow down, the engine briefly shudders once it reaches 60 mph. What would be causing that to occur? I have not noticed this activity at any other interval. Thanks for your help, Dave
In a stock 2009 Corvette the converter is set to unlock once you drop down to 58MPH while still in 6th gear. If you want to confirm that this is what's happening, repeat the test but have the car in Sport mode (but without touching the paddles). The release point is much lower in Sport mode (around 30MPH I think) so if the point at which the shudder happens is different between Drive and Sport mode, that's the cause of what you're feeling.
Tech Contributor
Joined: Oct 1999
Posts: 41,062
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From: Charlotte, NC (formerly Endicott, NY)
Many cars not just Corvettes have a similar shudder when the TCC releases or engages. The lighter the car and the bigger the engine the more it would be noticed. A rubber band motor like the ones that come in regular passenger cars wouldn't have as much affect on them due to the significantly higher weight of the vehicle and the low torque of the engine. Bill
Safety Car
Joined: Dec 2005
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From: North Carolina
St. Jude Donor '07-'08-'09-'11-'12
It's likely the lockup clutch releasing in your torque converter, although unless it's an aftermarket Vigilante you typically should never be able to feel it.
In a stock 2009 Corvette the converter is set to unlock once you drop down to 58MPH while still in 6th gear. If you want to confirm that this is what's happening, repeat the test but have the car in Sport mode (but without touching the paddles). The release point is much lower in Sport mode (around 30MPH I think) so if the point at which the shudder happens is different between Drive and Sport mode, that's the cause of what you're feeling.
In a stock 2009 Corvette the converter is set to unlock once you drop down to 58MPH while still in 6th gear. If you want to confirm that this is what's happening, repeat the test but have the car in Sport mode (but without touching the paddles). The release point is much lower in Sport mode (around 30MPH I think) so if the point at which the shudder happens is different between Drive and Sport mode, that's the cause of what you're feeling.
Chris has forgotten more than most know about the A6 
Now if only he was closer and had a Z06 rear for me
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