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Old 05-11-2009, 01:16 PM   #1
LDGn63
 
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LS3 - random missfire?

anybody have much experience with random missfire in the LS3?

at idle the tach dips every once in a while and i feel a shudder (very slight) and then sometimes at part throttle i seem to feel a "bump" form her.
I can hear it at idle standing outside the car too.
maybe i'm dreaming and am not used to the sound of the LS3...

no engine light but i'm not sure i want to take her back to the dealer so they can "play" with it...

please advise!
Thanks all!
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Old 05-11-2009, 01:22 PM   #2
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If this is true

Funny how the 6.1 Hemi's for the 09 challengers had that same problem, but was fixed with a revised ECM some other's just used tuners
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Old 05-11-2009, 01:56 PM   #3
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I think mine is doing something like that as well.
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Old 05-11-2009, 02:03 PM   #4
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I think mine is doing something like that as well.
damn me 2, i dunno what it is but hopefully its not bad.

If im sitting in the car with radio off and just at idle.

It will kind of lope , somewhat of a shudder.

havent noticed while driving though
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Old 05-11-2009, 02:11 PM   #5
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WOW guys let us know what that is when you find out. It can't be good for it.
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Old 05-11-2009, 02:28 PM   #6
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Get those cars to the dealers so the problem can get called into GM, maybe the reflash that was supposed to be done at the dealer was not done or they need a new Tune. Either way the dealer has some LS3 experience, this is not a new engine for the tech's let them check it out.
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Old 05-11-2009, 02:59 PM   #7
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how long should this take at a dealer?
i do NOT want to leave it overnight.
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Why oh Why?
Windshield=10" vertical
mirror= 3 7/8" (that's almost 4") vertical
that means that the mirror is 38.75% the size of the vertical windshield...
it sure seems like the ratio could be better... just sayin....

our collective MIRROR patch:
http://www.camaro5.com/forums/showthread.php?t=24612
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Old 05-11-2009, 03:01 PM   #8
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how long should this take at a dealer?
i do NOT want to leave it overnight.
That is a question only the dealer can answer. Bring it in an stay with it and see, maybe an adjustment, may be just the way it is, may be they do not know.
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Old 05-11-2009, 03:24 PM   #9
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Mine does the same thing...I thought it was just the LS3?

I also have a whine in my tranny from 1 - 2 - 3 gear. Anytime I shift after she warms the tranny whines. I'm going to the dealer either today or tomorrow to get the battery cable fixed and I'll ask them about both things then.
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Old 05-11-2009, 03:58 PM   #10
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Wow

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Originally Posted by I am Legend View Post
Mine does the same thing...I thought it was just the LS3?

I also have a whine in my tranny from 1 - 2 - 3 gear. Anytime I shift after she warms the tranny whines. I'm going to the dealer either today or tomorrow to get the battery cable fixed and I'll ask them about both things then.
That whining sounds like a throw out bearing is bad !
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Old 05-11-2009, 04:27 PM   #11
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how long should this take at a dealer?
i do NOT want to leave it overnight.
NOBODY KNOWS!!!!
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Old 05-11-2009, 05:03 PM   #12
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just got off the phone with the service manager of my local dealer. ( i bought somewhere else)
he told me not to worry about it until after 1K miles... said computers are set rich for break in.

????
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Why oh Why?
Windshield=10" vertical
mirror= 3 7/8" (that's almost 4") vertical
that means that the mirror is 38.75% the size of the vertical windshield...
it sure seems like the ratio could be better... just sayin....

our collective MIRROR patch:
http://www.camaro5.com/forums/showthread.php?t=24612
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Old 05-11-2009, 06:17 PM   #13
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I have the automatic, and the transmission also whines in 1st and 2nd, I don't know about 3rd, by then it usually smoothes out and sounds like a normal V8. The car will sometimes have a bump at idle, and it made me think that someone rear ended me. Also at idle it's not very smooth at all, maybe i'm just used to a smooth running GMC truck.
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Old 05-11-2009, 08:15 PM   #14
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Old 05-11-2009, 09:42 PM   #15
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GM's RQT (Reactive Quality Team) have developed an optimized solution to LS3 idle quality complaints:

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Old 05-11-2009, 09:50 PM   #16
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GM's RQT (Reactive Quality Team) have developed an optimized solution to LS3 idle quality complaints:

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Old 05-11-2009, 10:07 PM   #17
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Old 05-11-2009, 10:16 PM   #18
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ah, so im going to go with the fact that it is still in the rich break in period. once they air/fuel mixture is leaner it should smooth out. lemme know though!
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Old 05-11-2009, 10:48 PM   #19
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I do not have my car yet, but I'm a little worried....
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Old 05-11-2009, 10:52 PM   #20
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Great, i'm just gonna take the wheel weights off of my breaks and put them in the engine, duh, why didn't I think of that.
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Old 05-12-2009, 03:09 AM   #21
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if your running that rich at idle to where it affects how smooth it is, then I would change the oil very frequently (if that's what it is). Maybe the plug type/heat range chevy went with is less than optimal.
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Old 05-12-2009, 06:16 AM   #22
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I think taking it to the dealer is the smartest thing to do! It's under warranty and if there is something wrong, it's better to find out now then when your on the road out in the middle of nowhere!
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Old 05-12-2009, 11:07 AM   #23
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Mine has the lope too... I would not worry about it until after the brake-in... Could just be the cam.
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Old 05-12-2009, 11:12 AM   #24
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Mine has the lope too... I would not worry about it until after the brake-in... Could just be the cam.
This is exactly what I was thinking.
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Old 05-12-2009, 11:21 AM   #25
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most of that shaking at idle is the cam
think about it a high preformance motor you can always feel the cam
i know i can feel the cam in mine
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