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05-29-2012, 06:13 AM
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#1 |
 
Drives: Camaro ZL1 Join Date: May 2012
Location: Houston
Posts: 233
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Rough Idle
Has anyone else noticed a rough idle (approx 500 rpm)? It isnt always rough, but sometimes at idle the car feels like its missing on a cylinder and shakes the car a bit.
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05-29-2012, 06:21 AM
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#2 |
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DBLCHBY III
Drives: 15 1LE Join Date: Jun 2011
Location: Team Canada
Posts: 2,789
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Absolutely mine does the exact same thing , every once in awhile
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05-29-2012, 06:32 AM
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#3 |
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COTW 5/06/2013
Drives: 2017 Corvette Grand Sport-Ho-Vette Join Date: May 2012
Location: Milford, Michigan
Posts: 3,201
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Its a performance car, a little lope is normal.
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05-29-2012, 06:46 AM
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#4 |
 Drives: 2011 denali hd2500 Join Date: Sep 2011
Location: clarkston, mi
Posts: 186
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Agreed, mine was doing it this morning, it was more than the norm.
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05-29-2012, 06:56 AM
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#5 |
   
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mine does it at every start up and idle.. I would say
totally normal |
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05-29-2012, 07:11 AM
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#6 |
Drives: 2006 Corvette conv/2007 Avalanche Join Date: Jan 2012
Location: Niceville, FL
Posts: 155
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I think it's an LSx thing. My LS1 in my 98 Vette did it, my LS2 in my 2006 does it, my friends's LS3 Vette does it. I would bet the LS7 and the LS9 does it, too.
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05-29-2012, 07:13 AM
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#7 |
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My l99 does this on occaision also. It's the on occaision part the has me wondering. Why only sometimes?
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rx catch can;vmax ported throttle body;bowtie delete;SLP SS emblem;CAI cold air intake
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05-29-2012, 07:25 AM
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#8 |
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Boss Killer
Drives: 2012 ZL1, Black, A6 Join Date: Feb 2012
Location: East Longmeadow, MA
Posts: 78
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580 hp car and people say it has a rough idle. sorry but LOL
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05-29-2012, 07:44 AM
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#9 |
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bcguy
Drives: 2011 ss/rs m6 Join Date: Nov 2011
Location: british columbia canada
Posts: 507
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My 2ss does this and there is a big difference between cam lope and a rough idle that my car has. It's not all the time but sometimes it just runs like its missing. Anyone else have any insite on this
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05-29-2012, 10:20 AM
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#10 |
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Drives: 2017 Corvette Join Date: Jul 2011
Location: Texas
Posts: 258
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My LS3 Corvette had somewhat of a poor idle until I richened the idle mixture. I bumped up my MAF table up around 5% from 2400 frequenty (hz) value down. Much improved idle. I assume GM has these engine tuned lean at idle and part throttle for fuel economy.
Last edited by Bolt-onC6; 05-29-2012 at 02:29 PM. |
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05-29-2012, 12:51 PM
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#11 |
    Drives: 2023 Black ZL1 Auto Join Date: Oct 2009
Location: FEMA Region 4
Posts: 2,935
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Yeah, it could be fuel economy or emissions reasons. I notice mine will idle fine and every once in a while at a light I'll notice it will act like its missing, but then clear itself up. Kind of strange how its sporadic, but thankfully it is. I would have assumed the LSA would idle smoother than an LS3 or LS1 due to the supercharger cam, but there's something else going on.
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05-29-2012, 01:34 PM
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#12 |
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COTW 5/06/2013
Drives: 2017 Corvette Grand Sport-Ho-Vette Join Date: May 2012
Location: Milford, Michigan
Posts: 3,201
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Its just a low idle lump. if it were a true misfire there would be a check engine light for a misfire. Its a performance car. Anyone own a Harley or performance bike, the idle is constantly changing tones and rhythms.
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05-29-2012, 01:40 PM
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#13 |
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3bood
Drives: Camaro 2010 Join Date: Feb 2012
Location: UAE
Posts: 185
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I have same problem and i take the car to the dealer they clean the throttlebody and naw smooth idle
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05-29-2012, 02:11 PM
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#14 |
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Order in on 13' ZL1 vert
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Funny my Dodge Hemi 7 litre does this ever since I added the TVS supercharger. Not sure if it has anything to do with the blower's more complex air routing fuel delivery and the PCM adjusting to that (and I know that the LSx is MAF managed and the Hemi is speed density).....but I do notice a "twitch" during idle that will make the v-belt stumble a bit. It was smooth as silk before the blower so who knows.....maybe fuel quality and DA specifics.
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