Stock LS3: Idle and Off idle bucking
04-07-2009, 02:11 PM
#1
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Stock LS3: Idle and Off idle bucking
In my 05 with manual transmission I could let the clutch out at idle and the car would smoothly run at about 4 to 5 mph. If I do that with my 09 the car wants to buck and it won't run smoothly even slightly above idle, say 7 to 9 mph. Anyone else experiencing this with a stock LS3????
04-07-2009, 02:50 PM
#2
Sure do but I only notice it when she is cold...This being my first Vette I thought it was normal
04-07-2009, 03:03 PM
#3
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If it only did it cold, it wouldn't be an issue. Mine does it warmed up too.
04-07-2009, 03:05 PM
#4
OK...Good Luck
04-08-2009, 08:45 AM
#6
Could be LOTS of things to cause this. From a bad temp sensor to bad gasoline to vacuum leak. MANY possibilities. If its bad enough to feel, there should be a code set. If its as repeatable as you say, the dealer should be able to 'hook it up' and fix the problem. And, don't go for the "They all do that"
04-08-2009, 10:37 PM
#7
I have a similar issue. Mine is an A6. It wants to jump from 500/600 RPM to 1000/1100 RPMS and back. It won't stay in between. It is most noticeable at parking lot speeds. 4-5 MPH. Took it to one dealer and he couldn't find anything wrong. I've got to find a better dealer.
Bobby
Bobby
04-09-2009, 09:39 AM
#8
Former Vendor
The dealer is not going to do anything unless there is an updated PCM file. The PCM is causing the issues and the values need to be tweaked. My 08 M6 did this from day one. The timing is acceptable in the high and low octane tables. The fueling has a lot to be desired. My fueling equations were really lean under 1600 rpms. Once the equations were richened up, the problem is gone. The DFCO (deceleration fuel cut off) was too aggressive as well. The 08's I have seen have the same issue. It can be fixed and fine a tuner in your area to help you out. I used a PLX Wideband O2 Sensor to calibrate the equations as well.
04-09-2009, 01:47 PM
#9
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In my 05 with manual transmission I could let the clutch out at idle and the car would smoothly run at about 4 to 5 mph. If I do that with my 09 the car wants to buck and it won't run smoothly even slightly above idle, say 7 to 9 mph. Anyone else experiencing this with a stock LS3????
04-09-2009, 02:47 PM
#10
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Z51, mz6
