Results 1 to 11 of 11

Why do A6 08 LS3 Corvettes idle poorly?

This is a discussion on Why do A6 08 LS3 Corvettes idle poorly? within the Corvette forums, part of the Vehicle Specific category; I am in the market for an 08 LS3 automatic Z51. I've test driven three and idle quality is bad ...

  1. #1
    Member
    Join Date
    Aug 2005
    Location
    Sugar Land, Texas
    Posts
    115

    Supersonic Blue
    2012 Z06

    Why do A6 08 LS3 Corvettes idle poorly?

    I am in the market for an 08 LS3 automatic Z51. I've test driven three and idle quality is bad enough that I'm not going to spend over $50K for a car that runs no better than this. From idle in neutral to about 1500 rpm I detect a random misfire or sputtering. Moving in 6th gear light throttle in the 1200-1400 rpm range you can feel this misfire. It's not cam lope. I know cam lope. Does anyone with an A6 08 have this problem?

  2. #2
    SS#430 1 of 74 7camaro7's Avatar
    Join Date
    Oct 2005
    Location
    Nashville, TN
    Posts
    1,754

    Pewter
    02SS6spd VERT!

    never driven one, but I personally wouldn't care about "idle quality" I'd just want it to be fast as hell hahahaha. Chances are the car you drove was probably not broken in all the way too, you think that may be the problem?

  3. #3
    Member
    Join Date
    Dec 2005
    Location
    Cedar Rpaids,IA
    Age
    37
    Posts
    354

    Red
    1998 Camaro SS

    Being a new car, it might be that the computer has not learned enough about what timing and fuel setting it wants to have. During the learning program in the ECU you can experience some odd idles and can see this for about the first 200 miles or so. Tho it does not seem right this would be normal on an undriven new car.
    1998 Camaro SS Hard Coupe Bright Red #1593
    Mods: Lots!!, still my daily driver except for winter
    383rwhp 370rwft/lbs

    1979 Corvette
    Mods Lots!!, weekend cruiser
    325rwhp and 320rwft/lbs

    2007 Dodge Ram 1500 4x4 (Yes its got a HEMI)
    Mods: Catback, BFI CAI, Winter daily driver

  4. #4
    Member
    Join Date
    Aug 2005
    Location
    Sugar Land, Texas
    Posts
    115

    Supersonic Blue
    2012 Z06

    Quote Originally Posted by vetteemt View Post
    Being a new car, it might be that the computer has not learned enough about what timing and fuel setting it wants to have. During the learning program in the ECU you can experience some odd idles and can see this for about the first 200 miles or so. Tho it does not seem right this would be normal on an undriven new car.
    Test drove a used 08 vette last night with 6400 miles and had the same misfire from idle up to about 1400/1500 rpm in neutral and very light throttle moving in 6th with converter locked.

  5. #5
    Member
    Join Date
    Dec 2005
    Location
    Cedar Rpaids,IA
    Age
    37
    Posts
    354

    Red
    1998 Camaro SS

    Quote Originally Posted by Larry View Post
    Test drove a used 08 vette last night with 6400 miles and had the same misfire from idle up to about 1400/1500 rpm in neutral and very light throttle moving in 6th with converter locked.
    It might just be how GM has the computer tuned from the factory. They have to worry about emissions and other things that aftermarket tuners don't have too. I'm not saying that they did it because of emissions, but you might want to check with some of the dyno tuners to see if they have seen this and if they have been able to eliminate it. If you plan on mods then youíll be getting a dyno tune most likely anyways.

  6. #6
    Member
    Join Date
    Aug 2005
    Location
    Sugar Land, Texas
    Posts
    115

    Supersonic Blue
    2012 Z06

    Quote Originally Posted by vetteemt View Post
    It might just be how GM has the computer tuned from the factory. They have to worry about emissions and other things that aftermarket tuners don't have too. I'm not saying that they did it because of emissions, but you might want to check with some of the dyno tuners to see if they have seen this and if they have been able to eliminate it. If you plan on mods then youíll be getting a dyno tune most likely anyways.
    I think you are right, it's in GMs tuning. However not sure it can be tuned out. Talked to one tuner and he said he has not been able to tune it out. Apparently most Corvette owners are not dialed into their cars enough to even notice this. It's not terribly bad as I mentioned but still a misfire is evident.

  7. #7
    Member
    Join Date
    Dec 2005
    Location
    Cedar Rpaids,IA
    Age
    37
    Posts
    354

    Red
    1998 Camaro SS

    Quote Originally Posted by Larry View Post
    I think you are right, it's in GMs tuning. However not sure it can be tuned out. Talked to one tuner and he said he has not been able to tune it out. Apparently most Corvette owners are not dialed into their cars enough to even notice this. It's not terribly bad as I mentioned but still a misfire is evident.
    LOL Corvette owners not dialed into their cars I'm in my local Corvette club and it always gets me when some of the newer c5 and c6 vette owners know nothing about there cars. After building my SS Lsx engine up I would give most advice on parts to use were to get a tune done etc.. and they always argue with me that the engine in my Camaro is different then the Corvette version (LS1 is a LS1 LS6 is a LS6 etc) Which Iíd ask how and the normal response is I donít know but the Corvette version must be better then the Camaro version. Also if you buy a 08 you could always put in a bigger cam which will give you a lopey idle and misfires would be normal then. This would not fix the problem but would give a good excuse to why its misfiring??

  8. #8
    Member stanger88's Avatar
    Join Date
    Sep 2006
    Location
    Shreveport, LA
    Age
    31
    Posts
    298

    Black on black.
    2001 WS6 M6 (stock)

    Quote Originally Posted by Larry View Post
    I think you are right, it's in GMs tuning. However not sure it can be tuned out. Talked to one tuner and he said he has not been able to tune it out. Apparently most Corvette owners are not dialed into their cars enough to even notice this. It's not terribly bad as I mentioned but still a misfire is evident.
    Anyone who buys a 'vette is not nit-picking for quality. THey buy it for the looks, power, or stigma. I have NOT YET seen ONE C6 that didn't have trash in the paint down to the metal in a visible area or have a body-panel misalignment issue with the headlights/front end. We aren't talking micrometer measurements, we are talking I saw where they ground a panel down and painted clear over it on one side and the other stuck up 1/3 inch from flush. We are talking backyard mechanic front-end job type quality. I am very impressed with the driveline and suspension, but the body work/QC makes me gag.

  9. #9
    Member
    Join Date
    Aug 2005
    Location
    Sugar Land, Texas
    Posts
    115

    Supersonic Blue
    2012 Z06

    Quote Originally Posted by stanger88 View Post
    Anyone who buys a 'vette is not nit-picking for quality.
    Perhaps but the engine should not have a misfire!

  10. #10
    Member Frosty's Avatar
    Join Date
    Aug 2005
    Location
    Near Philly
    Posts
    338

    White/Silver
    1989 GTA 98 GTP coupe

    Quote Originally Posted by Larry View Post
    Apparently most Corvette owners are not dialed into their cars enough to even notice this.
    ..or possibly they're not whining like a 5yr old school girl.....
    -98 GTP Coupe. Silvermist and stock.

    -89 GTA*** L98, P1-SC, 24# SVO's, MSD 6-A, March underdrive pulleys, Edelbrock headers/catback and some other goodies.

    ~Tony

  11. #11
    Member Cronex's Avatar
    Join Date
    Jul 2007
    Location
    Philadelphia, PA
    Posts
    367

    Pewter
    2001 Trans Am #693

    I would say im more then sure it is how GM tuned it. I would just get it if I liked it alot and re-tune it.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. idle issues... idle high. unplugged tps runs good?
    By okiels1 in forum Firebird / WS6
    Replies: 2
    Last Post: 12-31-2016, 04:36 AM
  2. Help: Engine running very very poorly - ideas?
    By cullywoo in forum General Help
    Replies: 28
    Last Post: 09-05-2012, 10:57 AM
  3. Help: SES Flashing, Lean bank 1, Misfire #6 running poorly
    By bhunter0830 in forum General Help
    Replies: 57
    Last Post: 06-21-2012, 12:22 PM
  4. '97 LT1 running poorly...
    By LT4Hawk9 in forum LT1
    Replies: 1
    Last Post: 07-29-2010, 01:58 PM
  5. Help: Z28 Running Poorly
    By cm86414 in forum General Help
    Replies: 10
    Last Post: 05-28-2009, 06:52 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •