09 LS3 Low Speed Bucking with Manual Trans
#1
Race Director
Thread Starter
Member Since: Jun 2005
Location: Phila Suburbs 2023 C8 & 2013 650ix
Posts: 10,427
Received 2,225 Likes
on
1,141 Posts
09 LS3 Low Speed Bucking with Manual Trans
Just wondering if this is a common situation with the 09 LS3 at speeds just above idle in first gear.
If I'm stuck in traffic and am in 1st, the car will drive smoothly at idle at around 5 mph. But if I try to increase the speed a little to 6 to 11 mph, it's impossible to drive smoothly because the engine will buck. At 12 mph it's smooth again.
I've also noticed that in neutral you can not hold any RPM between idle ~600 rpm and 1100 rpm. The slightest touch of the gas the engine goes from idle up to 1100 rpm.
Any ideas? Also, the engine is totally stock.
If I'm stuck in traffic and am in 1st, the car will drive smoothly at idle at around 5 mph. But if I try to increase the speed a little to 6 to 11 mph, it's impossible to drive smoothly because the engine will buck. At 12 mph it's smooth again.
I've also noticed that in neutral you can not hold any RPM between idle ~600 rpm and 1100 rpm. The slightest touch of the gas the engine goes from idle up to 1100 rpm.
Any ideas? Also, the engine is totally stock.
#2
Tech Contributor
Member Since: May 2008
Location: Howell Michigan
Posts: 2,844
Likes: 0
Received 15 Likes
on
15 Posts
St. Jude Donor '09-'10-'11
It is a guess on my part, but I expect that the jump you speak of has something to do with the calibration transitioning from a pure lookup table to using the MAF sensor. The 6 speed manual CTSv I’m driving does a similar thing. I find that while creeping in heavy traffic or expressway backups, that shifting to a higher gear can help by keep the rpm in the more linear area of the throttle. JMHO
#4
Race Director
Thread Starter
Member Since: Jun 2005
Location: Phila Suburbs 2023 C8 & 2013 650ix
Posts: 10,427
Received 2,225 Likes
on
1,141 Posts
Has anyone had any luck in getting this problem fixed under warranty. My 05 LS2 never had this problem.
#5
Instructor
Member Since: Dec 2001
Location: Rancho Palos Verdes CA
Posts: 114
Likes: 0
Received 0 Likes
on
0 Posts
Heck, I thought it was just me. I can't get it to smooth out using the throttle unless I go ahead and launch. Owned manuals all my life, never had this issue.
#7
Race Director
Thread Starter
Member Since: Jun 2005
Location: Phila Suburbs 2023 C8 & 2013 650ix
Posts: 10,427
Received 2,225 Likes
on
1,141 Posts
Mine is a Z51 but don't think that makes any difference since it's an engine problem between 600 and 1100 rpm not a transmission problem.
#8
Racer
#9
Mine does it as well, but it's mainly on decel when the rpms are low in gear....say perhaps when I'm crusing slowly in stop and go traffic in 2nd gear, and don't feel like going down to first. The on and off motion with the gas pedal will cause it to buck a bit.......but it may be attributed to just being a bit low rpm wise in gear. I know exactly what you're talking about, and your post title definitely caught my eye. Mine is a Z51 as well, don't know if the lower gearing in the trans would attribute to that much of a difference over the base gear ratios.
-Brian
-Brian
#11
My automatic does the same thing. I have taken it to two different dealers and they don't know how to fix it. Mine is s base model and stock.
This was my original post on the issue.
http://forums.corvetteforum.com/c6-t...seriously.html
Bobby
This was my original post on the issue.
http://forums.corvetteforum.com/c6-t...seriously.html
Bobby
#12
I would disconnect the battery for a few mins then reconnect make sure HVAC controls and radio are both off. Then start car and don't touch throttle for a few mins. See if that helps at all. Don't forget to re-index the windows after all that.
#13
Race Director
Thread Starter
Member Since: Jun 2005
Location: Phila Suburbs 2023 C8 & 2013 650ix
Posts: 10,427
Received 2,225 Likes
on
1,141 Posts
oneblackvette
What do you think disconnecting the battery would accomplish?
My gut feeling is that what I'm experiencing is going to be considered normal by the dealer like kk5zc reported. Mine has done this since new and I now have around 9000 miles on it.
What do you think disconnecting the battery would accomplish?
My gut feeling is that what I'm experiencing is going to be considered normal by the dealer like kk5zc reported. Mine has done this since new and I now have around 9000 miles on it.
Last edited by Walt White Coupe; 08-24-2009 at 10:03 PM.
#14
Racer
Member Since: Jul 2007
Location: Fayetteville NC
Posts: 323
Likes: 0
Received 0 Likes
on
0 Posts
Mine has done this as well since the very first day I received 'er with one mile on the odometer. A tune helped to help fix the issue for the most part but occaisionally I still notice a very slight bucking at low speeds as described earlier. I've tried the battery disconnect a few times and it never worked.
#15
Instructor
Member Since: May 2009
Location: Portland Oregon
Posts: 230
Likes: 0
Received 0 Likes
on
0 Posts
Mine does that too, 2k9 z51. was wondering if that could just be the way the throttle -by-wire works, going from idle state to min throttle... dealer was first doubting there really was anything perceptible, then couldn't find anything wrong.
I guess it's just the way it is then
I guess it's just the way it is then
#16
Drifting
Just wondering if this is a common situation with the 09 LS3 at speeds just above idle in first gear.
If I'm stuck in traffic and am in 1st, the car will drive smoothly at idle at around 5 mph. But if I try to increase the speed a little to 6 to 11 mph, it's impossible to drive smoothly because the engine will buck. At 12 mph it's smooth again.
I've also noticed that in neutral you can not hold any RPM between idle ~600 rpm and 1100 rpm. The slightest touch of the gas the engine goes from idle up to 1100 rpm.
Any ideas? Also, the engine is totally stock.
If I'm stuck in traffic and am in 1st, the car will drive smoothly at idle at around 5 mph. But if I try to increase the speed a little to 6 to 11 mph, it's impossible to drive smoothly because the engine will buck. At 12 mph it's smooth again.
I've also noticed that in neutral you can not hold any RPM between idle ~600 rpm and 1100 rpm. The slightest touch of the gas the engine goes from idle up to 1100 rpm.
Any ideas? Also, the engine is totally stock.
#17
Racer
Member Since: Apr 2007
Location: Shrewsbury MA
Posts: 255
Likes: 0
Received 0 Likes
on
0 Posts
#18
Burning Brakes
Member Since: Nov 2006
Location: Yorkville IL
Posts: 1,098
Likes: 0
Received 0 Likes
on
0 Posts
Just wondering if this is a common situation with the 09 LS3 at speeds just above idle in first gear.
If I'm stuck in traffic and am in 1st, the car will drive smoothly at idle at around 5 mph. But if I try to increase the speed a little to 6 to 11 mph, it's impossible to drive smoothly because the engine will buck. At 12 mph it's smooth again.
I've also noticed that in neutral you can not hold any RPM between idle ~600 rpm and 1100 rpm. The slightest touch of the gas the engine goes from idle up to 1100 rpm.
Any ideas? Also, the engine is totally stock.
If I'm stuck in traffic and am in 1st, the car will drive smoothly at idle at around 5 mph. But if I try to increase the speed a little to 6 to 11 mph, it's impossible to drive smoothly because the engine will buck. At 12 mph it's smooth again.
I've also noticed that in neutral you can not hold any RPM between idle ~600 rpm and 1100 rpm. The slightest touch of the gas the engine goes from idle up to 1100 rpm.
Any ideas? Also, the engine is totally stock.
#19
Racer
Member Since: Sep 2007
Location: Mount Airy MD
Posts: 278
Likes: 0
Received 0 Likes
on
0 Posts
'09 C6 Z51 6 spd manual - No issues with bucking in traffic in 1st gear between idle and 15mph, unless, I make it buck myself
I can pretty much hold it at any speed without a problem.
I can pretty much hold it at any speed without a problem.
#20
Race Director
Thread Starter
Member Since: Jun 2005
Location: Phila Suburbs 2023 C8 & 2013 650ix
Posts: 10,427
Received 2,225 Likes
on
1,141 Posts
09C6Coupe,
If you are in neutral, can you hold any rpm between idle and 1100 rpm? Like say 850 rpm? Mine jumps from idle to 1100 rpm. Can not hold anything in between.
If you are in neutral, can you hold any rpm between idle and 1100 rpm? Like say 850 rpm? Mine jumps from idle to 1100 rpm. Can not hold anything in between.