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04-19-2012, 09:52 PM
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#1 |
 Drives: 12 LFX SIM M6 Join Date: Apr 2012
Location: SoCal
Posts: 4
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Idle question - 12 LFX
First want to say what a great site!!
 1st post  I just purchased mine in Feb and have enjoyed reading all the information on this site! I want to see if anyone else experiences the same idle tendencies as mine with a cold start up. It will start up, idle high and steady then slowly go down (not to cold in SoCal). The idle will settle down to steady 500 rpm. Question is this - it feels like little tremors, random shakes as it idles down. The tach stays steady and no change in rpm with the tremors. But after it settles to regular rpm they are no longer there. Anyone else feel this? Is this normal? Thanks! |
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04-19-2012, 09:55 PM
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#2 |
            
Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009
Location: Jefferson City, Missouri
Posts: 13,949
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Really hard to say without seeing for myself in person, but sounds perfectly normal really. Unless the car really shakes like its miss-firing or something as it idles down then I doubt it is anything to worry about. Its just little bitty shakes...I wouldn't worry.
Welcome to the site!!
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2016 Camaro 1SS - 8-speed - NPP - Black bowties
2010 Camaro 1LT V6 (Sold. I will miss her!) |
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04-20-2012, 01:46 AM
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#3 |
 Drives: 2012 Camaro 1LT/RS Join Date: Feb 2012
Location: Virginia
Posts: 81
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i have a 12 and mine does the exact same thing but never really thought anything of it.. so good ? anyone have a answer
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04-20-2012, 08:30 AM
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#4 |
Drives: 2012 45th RS Join Date: Jan 2012
Location: Festus, Mo.
Posts: 77
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I get the same thing. Only does it as it idles down to normal. Has never thrown a code and honestly, it's not very noticable. I'm taking mine to the dealer tomorrow to have a new headlight installed (moisture inside). My cousin works in the service department. I'll ask him. I'm sure they're going to say it's normal or wait for a code. If I have any news, I'll post it.
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04-20-2012, 08:46 AM
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#5 |
 
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I've not had this problem with my '12.
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04-20-2012, 09:40 AM
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#6 |
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Account Suspended
Drives: jealous vendors mad!! HAHA!! Join Date: Jan 2011
Location: CYBERGMONSTER@GMAIL.COM
Posts: 3,658
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every GM direct injected vehicles have it. its called cat warm up mode. strictly emission related only to warm up your catalyst converter super fast. it does this by commanding your car's idle to run high super rich, usually at 1k rpm for 20-30 seconds. Just make sure you keep your eye out while in this mode. There's been many guys including myself which include all GM SIDI brands that had their cat warm up mode misfire, causing rough idle, missing, shaking, during this 20-30 seconds. sometimes it will throw an actual misfire codes. There's a TSB for this. it supposed to reflash your ecm with higher idle. Some of us with a tune can't take advantage of this tho... little trembling and just a little shake here and there is completely normal. You will know if your cat warm up mode need attention.
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04-20-2012, 11:15 AM
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#7 |
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Founder - Michigan FBody
Drives: 1994 Camaro LT1, 2012 Camaro 2SS/RS Join Date: Jun 2008
Location: New Haven, MI
Posts: 2,599
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Might just be the air pump. When the air pump kicks on during cold starts you might have a higher idle.
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2012 Camaro 2SS/RS L99 - "Zooma"
1994 Camaro LT1 A4 - "Red Alert" - v6-to-LT1 Swapped Cruiser; Cammed, Stalled, Enjoyed "Gone But Not Forgotten" 2016 Camaro 1LT A8 - "Elmo" 2014 Camaro 1LT M6 - "Cherry Bomb" 2012 Camaro 1LS M6 - "Clifford" Michigan FBody Association http://www.mifbody.com/ |
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04-23-2012, 07:39 AM
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#8 | |
Drives: 2012 2LT/RS Join Date: Oct 2011
Location: Northeast
Posts: 1,443
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Quote:
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04-23-2012, 04:42 PM
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#9 |
Drives: 2011 5.7L Tundra Double-Cab X-SP Join Date: Mar 2012
Location: Birmingham, AL
Posts: 2,031
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I have wondered and felt this exact same thing, I have driven older vehicles that mis-fired and that is the best way to explain it. I understand the fan/idle up and all that but this is a distinct twitch very very similiar to a mis-fire. I have ruled it out but I am going to mention it to my dealer on my first (free) oil change.
It comes and goes meaning it doesn't do this during every cold start. Maybe 2 of 5 times... Seems like this may be something more than just a little shake... |
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05-15-2012, 06:28 PM
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#10 |
Drives: 04 Silverado Join Date: Jun 2010
Location: Floriduh!
Posts: 1,113
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llt i rented for a week did it as well.
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05-15-2012, 07:15 PM
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#11 | |
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Drives: 2012 Summit White 1Ls Join Date: Jan 2012
Location: Diamond Bar, Cali
Posts: 898
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Quote:
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05-16-2012, 01:02 AM
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#12 |
Drives: 1979 Camaro Z28, 2012 Camaro 2LT RS Join Date: Apr 2012
Location: Salem, OR
Posts: 14
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Does anyone have any issue with their LFX on cold start where they will get a very high pitched whistle? My LFX has 800 miles on it and its done it for awhile. I don't know if its normal but its definitely an annoyance. It seems to only do it on a cold start though and eventually goes away. The stereo is off, the fans are off so I know there's not interference through there.
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05-16-2012, 07:52 AM
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#13 |
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Lifetime Philly Fan
Drives: 2015 Spring Edition 2SS M-6 Join Date: Mar 2012
Location: South Central Florida
Posts: 1,862
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Yup, mine too. But to me it's a non-issue. I love my car!
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2015 Green Flash, Delivered 4/10/15
CAI, NPP Exhaust, Short-throw shifter BBK LT HEADERS 1 7/8” Tune by DynoSteve via SCTx4 Tuner One of 82 GF Ragtops built in '15 out of 811 Total [/SIZE]  |
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