ls-3 rough idle on start-up
Thread Starter
Instructor
Joined: Jul 2007
Posts: 161
Likes: 1
ls-3 rough idle on start-up
A few weeks ago I traded in my 07 coupe for a 2011 coupe. I love the newer car and the ls-3 is awsome except for one thing, rough idle on start-up when cold. Is this normal? Compared to my 07s ls-2 this thing feels like it has a plug wire loose or something,(I checked them). All is good after warm-up and I don't want to make a trip to the dealer if this is normal.
Le Mans Master
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Thread Starter
Instructor
Joined: Jul 2007
Posts: 161
Likes: 1
Thanks for all the info folks! I can now enjoy my car even more knowing she's perfectly normal. I have noticed the inside of the exhaust tips stay cleaner longer with the new car so the timing for cats warm-up thing must be right on.
Last edited by vettephyxer; Jul 22, 2011 at 09:01 AM.
Team Owner
Joined: Sep 2000
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
If you have the A6 tranny, many/most of the cars also have a slight shudder or vibration for a second or two, when you ease off the gas about 60 mph. This is also "normal", and it sounds great if you have the NPP open. 
2nd Gear
Joined: Jul 2011
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From: Placerville California
Normal
Ditto the it's normal comments...
My 2008 M6 always has a "cold" lope at idle for a few seconds rolling out of the shop. By the time I'm down the street at the stop sign it's running smoothly. It reminds me of my 5.0 Mustangs of ~1990--which always had a burble at idle.
My 2008 M6 always has a "cold" lope at idle for a few seconds rolling out of the shop.
By the time I'm down the street at the stop sign it's running smoothly. It reminds me of my 5.0 Mustangs of ~1990--which always had a burble at idle.
Advanced
Joined: Dec 2008
Posts: 53
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From: SE Florida
Why?
Because on a cold start up your computer is in open loop mode until it reaches target temps/values, then it goes into closed loop mode using primarily the o2 sensors to adjust fuel delivery and timing for minimum emissions, optimum gas mileage and power.
Last edited by Corvette V; Jul 26, 2011 at 08:32 AM.
