sputtering for 5-10 sec after a cold start (LS3) - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

rcracer78 · 12-09-2009, 04:40 PM

Today was one of the coldest mornings we've had for a while in Southern California. (40f) I get in the car to go to work this morning, start the car and it kind of sputtery and idling at a lower rpm than it usually does. After about 5-10 seconds it stops idling iradically/sputtering. Car warms up and runs like a champ.

Now normally when I start the car in the morning, it starts strong and idles at higher rpm till it warms up. (I LOVE THE WAY IT SOUNDS WHEN I START IT

)

I thought I remember reading on an LS forum somewhere, that the computer will advance the timing a little due to the O2 sensors not being able to obtain an accurate reading until a little warm. Is this true? Anybody have this issue during a cold start?

BigMatt · 12-09-2009, 05:03 PM

misfire maybe?

*radz28* · 12-09-2009, 05:12 PM

Mods'? Any past problems with the car?

ORANGE U NV · 12-09-2009, 05:19 PM

My L99 runs rough for about 3 to 5 seconds when I first crank it up & after sitting all night. I have a Roto-fab CAI now, but it has done it since it was new with a stock intake. Only does it if it has been parked overnight.

rcracer78 · 12-09-2009, 05:32 PM

Quote:

Originally Posted by radz282003

Mods'? Any past problems with the car?

Airaid CAI
&
Solo Performance cat-back straight pipe w/x-pipe resonator

ffrcobra_65 · 12-09-2009, 05:44 PM

yep, it has been cold in SoCal lately. I have a LS3 as well and it actually seems to fire up quicker in the cold mornings but like you said, for about 10 seconds, it does idle rougher and takes longer to settle to 500rpm than normal morning temps. It doesn't bother me except, you tend to hear the panels rattle when it is idling rough before it settles.

rustybh1 · 12-10-2009, 10:27 AM

Quote:

Originally Posted by rcracer78

Today was one of the coldest mornings we've had for a while in Southern California. (40f)

15f here in Seattle and yes, for about 5 seconds this morning mine sounded a little rough, but like you said it soon picks up and gets back to normal. Not worried for the time being.

Easy Go · 12-10-2009, 11:45 AM

Keeps emmissions down to run lean at start up. Don't worry about it - just thank the EPA.

rcracer78 · 12-10-2009, 12:53 PM

Quote:

Originally Posted by rustybh1

15f here in Seattle and yes, for about 5 seconds this morning mine sounded a little rough, but like you said it soon picks up and gets back to normal. Not worried for the time being.

Quote:

Originally Posted by Easy Go

Keeps emmissions down to run lean at start up. Don't worry about it - just thank the EPA.

Thank God! That's a piece of mind. It did it this morning again, but not as bad. I wonder how high the ambient temperature has to be in order for this not to happen. Like I said, it's been low 40f mornings lately. (It's not 15f, but still a little chilly for us Southern Californians. I had to wear a sweater this morning:()

gwbates3 · 12-13-2009, 08:32 PM

I noticed the same thing on mine (V6 A6) the last week down under 45 deg in the AM.

mtcwby · 12-13-2009, 08:40 PM

Quit whining, we'd give anything to have 40 degree mornings right now in CO. LOL
We had 4 mornings in a row last week that were below 0. One morning was
17 below zero. By the way, the camaro started right up that morning.

12-09-2009, 04:40 PM	#1
rcracer78 Drives: 2010 Camaro 2SS Join Date: Jun 2009 Location: CA Posts: 211	sputtering for 5-10 sec after a cold start (LS3) Today was one of the coldest mornings we've had for a while in Southern California. (40f) I get in the car to go to work this morning, start the car and it kind of sputtery and idling at a lower rpm than it usually does. After about 5-10 seconds it stops idling iradically/sputtering. Car warms up and runs like a champ. Now normally when I start the car in the morning, it starts strong and idles at higher rpm till it warms up. (I LOVE THE WAY IT SOUNDS WHEN I START IT ) I thought I remember reading on an LS forum somewhere, that the computer will advance the timing a little due to the O2 sensors not being able to obtain an accurate reading until a little warm. Is this true? Anybody have this issue during a cold start?

12-09-2009, 05:03 PM	#2
BigMatt 2010 Camaro 2 SS/RS M6 Drives: 2010 Camaro SS/RS Join Date: May 2009 Location: Clayton Delaware Posts: 1,218 View My Garage	misfire maybe? __________________ Forged LS3, FED M311 heads, CAI Inc, ARH 1 7/8, Corsa Xtreme, Taylor Wires, MGW Shifter, Street slayer twin carbon clutch, Tick braided clutch line & speed bleeder, ZL1 Diff Swap, BMR Split drop, Sway Bars, Trailing Arms, Toe Rods, Pro bushing kit, Carslyle racing 15in conversion, Whipple, LPE dual fuel pumps, Rx catch can, Id1300x, Alky Control

12-09-2009, 05:12 PM	#3
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,186 View My Garage	Mods'? Any past problems with the car? __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

12-09-2009, 05:19 PM	#4
ORANGE U NV Drives: The Wife Crazy Join Date: Jul 2009 Location: TAMPA BAY Posts: 550	My L99 runs rough for about 3 to 5 seconds when I first crank it up & after sitting all night. I have a Roto-fab CAI now, but it has done it since it was new with a stock intake. Only does it if it has been parked overnight. __________________ "God is great, beer is good and people are crazy" 2010 2SS IOM/IOM L99 Black Rally Stripes, Polished Wheels, Loudmouth II, Rotofab CAI, IOM Heritage Grille,Tune by Jeremy Formato (Fasterproms Tuning).

12-13-2009, 08:32 PM	#10
gwbates3 Ruby & Blu Imp Drives: 2010 LS3 2SSRS M6 & LLT RS A6 Join Date: Dec 2009 Location: Charlotte, NC Posts: 293	I noticed the same thing on mine (V6 A6) the last week down under 45 deg in the AM. __________________ Ruby 2SSRS M6 - Blown & LLT RS A6

12-09-2009, 05:44 PM	#6
ffrcobra_65 Account Suspended Drives: SuperCharged 2SS/RS IOM MN6 Join Date: May 2009 Location: CA Posts: 5,094	yep, it has been cold in SoCal lately. I have a LS3 as well and it actually seems to fire up quicker in the cold mornings but like you said, for about 10 seconds, it does idle rougher and takes longer to settle to 500rpm than normal morning temps. It doesn't bother me except, you tend to hear the panels rattle when it is idling rough before it settles.

12-10-2009, 11:45 AM	#8
Easy Go Drives: LLT MV5 B34 N65... period. Join Date: Nov 2009 Location: - Posts: 283	Keeps emmissions down to run lean at start up. Don't worry about it - just thank the EPA.

12-13-2009, 08:40 PM	#11
mtcwby High on "The Camaro Life" Drives: 2010 2SS, IOM, LS3, Vortech, LG cam Join Date: May 2009 Location: Big Sandy, MT & Yuma, AZ Posts: 1,028 View My Garage	Quit whining, we'd give anything to have 40 degree mornings right now in CO. LOL We had 4 mornings in a row last week that were below 0. One morning was 17 below zero. By the way, the camaro started right up that morning. __________________ "The democracy will cease to exist when you take away from those who are willing to work and give to those who are not."-Thomas Jefferson------Going Strong at 39,250 miles

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