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07-26-2012, 11:43 AM
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#1 |
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The Machinist
Drives: 2012 2SS/RS LS3 IBM silver rally Join Date: May 2012
Location: Norman, OK
Posts: 402
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Idle surge after pulling out of gear?
When I pull ut of a gear sometimes I get an idle surge of about 500 rpm. instead of it staying down at around 500rpm it will surge up to about 1000 then back to 500 then to about 750 then finally rests back at 500rpm. Any ideas what this could be? I have a tune from Ted at JRE ....could this be a tune problem? Please help.
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American Racing Headers w/high-flow cats and x-pipe, Flowmaster American Thunder Axle-back mufflers, VMAX ported throttle body, CAI intake, ADM race scoop, RX Catch Can, PEDDERS Street Z package-ZL1 sways-XA Coilovers, PFADT trailing arms-toe rods, RPM 3:91 gears, RPM Stage V Trans, ADM diff bushings, tune by ADM, and still bustin' knuckles!
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07-26-2012, 11:58 AM
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#2 |
       
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Mine does something similar. When I am coasting down and I pop into neutral and let out the clutch - the rpms will blip up to about 1400 and then drop back down to my normal idle of 925 ( high idle because of cam). I've always chalked it up to a small quirk that comes with a cammed tuned car. It does it every time and only in the way I have mentioned it so it doesn't affect drivability or saftey ( I'm in neutral with the clutch out) so I just live with it. Not a biggie for me - just odd. My guess is that it is some time of brief conflict between the MAF and ECU.
note: Mine has been fully dyno and street tuned by Vengeance - and other than this one little oddity - it runs great!
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2016 Camaro 1SS Hyper Blue 6MT NPP
2010 Camaro 2SS Cam/Headers/CAI/3.91 gears 476 rwhp/440 rwtq (sold) Last edited by SSDan; 07-26-2012 at 12:57 PM. |
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07-26-2012, 03:40 PM
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#3 |
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The Machinist
Drives: 2012 2SS/RS LS3 IBM silver rally Join Date: May 2012
Location: Norman, OK
Posts: 402
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I talked to a very reliable source and he said it was more than likely a vacuum leak somewhere.
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American Racing Headers w/high-flow cats and x-pipe, Flowmaster American Thunder Axle-back mufflers, VMAX ported throttle body, CAI intake, ADM race scoop, RX Catch Can, PEDDERS Street Z package-ZL1 sways-XA Coilovers, PFADT trailing arms-toe rods, RPM 3:91 gears, RPM Stage V Trans, ADM diff bushings, tune by ADM, and still bustin' knuckles!
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07-27-2012, 01:20 AM
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#4 |
 
Drives: 2012 45th anniv. Convertible SS LS3 Join Date: Oct 2011
Location: Riverside, CA
Posts: 321
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The last time I had an idle surge such as this I found a vaccum leak in the intake. I have another one that is killing my MPG, but haven't found the source yet.
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07-27-2012, 01:06 PM
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#5 |
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Dont H8 Me Cuz U Aint Me
Drives: 2016 SS Sedan, 2017 Explorer Sport Join Date: Feb 2010
Location: Tulsa, Oklahoma
Posts: 2,910
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Wish I knew how to hunt vacuum leaks on a DIY basis. Im assuming I have one too as my true neutral coasting causes my idle to ramp up about 150-200rpm..
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07-27-2012, 01:30 PM
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#6 |
 Drives: 2011 Camaro 2SS/RS Join Date: May 2011
Location: Boston, MA
Posts: 43
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^^ Mine does too, after headers/CAI/Jannetty tune. Wondering if its a normal thing. Definitally a 100-200 rpm back and forth thingamajig happening after clutch is pressed in at stoplights.
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07-27-2012, 02:02 PM
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#7 |
Drives: 11 IBM n White 2SS/RS M6 Join Date: May 2011
Location: Tewksbury Ma
Posts: 358
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Yep.. I find the same behavior with my LS3 and recent JRE 470 Cam with CIA with ported T Body fed by JRE Scoop headers and tune.
I am sure Ted will add his thoughts once he reads this I am thinking this is new behavior, could be related to the ported t body if anything at least in my case, I surely dont see this as a problem, just new behavior as result of the get gone goodies!! |
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07-27-2012, 05:52 PM
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#8 |
 
Drives: 2011 2SS/RS Camaro Join Date: Apr 2012
Location: SW Ohio
Posts: 73
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Frank
2011 2SS/RS L99 GMPP Exhaust  |
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07-27-2012, 06:01 PM
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#9 |
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Treasure Coast Camaro 5
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Mine also rev's up i never thought it could b a problem. Don't have anything from Ted. So it is not just his tune.
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07-27-2012, 08:40 PM
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#10 |
 Drives: 2010 1SS/RS M6 Join Date: May 2010
Location: Ontario
Posts: 115
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My car has always done it, bone stock except for a ported throttle body.
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07-27-2012, 10:27 PM
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#11 |
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Drives: 2012 45th anniv. Convertible SS LS3 Join Date: Oct 2011
Location: Riverside, CA
Posts: 321
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Common denominator it sounds like is the ported TB. Wondering if it could be the ported TB.
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07-27-2012, 11:49 PM
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#12 |
Drives: 2010 Camaro 2SS/RS M6 Join Date: Dec 2009
Location: Valencia, Ca.
Posts: 141
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No ported TB here but I get the same thing. JRE cam and tune. I'll be lookin' for a vacuum leak tomorrow.
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07-28-2012, 05:51 AM
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Mine bone stock didn't do it, addition of ported throttle body is when it began.
Ed M.
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RJT 2SS/RS, AAM 3.70's, MTI Sway Bars, Shifter & SS brake lines, ZLI calipers, rotors & pads, BMR Trailing & Toe Arms, rear cradle & diff bushes, Pedders XA's, Camber/Toe eccentrics, Radius arm inserts, GTO clutch reservoir, LS9 cam, Comp valve springs, Melling 10296 oil pump, CR5 timing chain, LS6 damper, CAI Cold Air Intake, ARH LT headers w/HF cats, GMPP touring axle back, Elite Engineering Catch Can, Forgeline 20x9.5 & 20x11 DS3 whls, 275/40/20 & 315/35/20 tires, 2011 Convertible spoiler, 1LE front spoiler, Lloyd "SS" Floor Mats, GM Camaro Trunk Mat, wrapped console & Grant steering wheel.
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07-28-2012, 06:48 AM
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#14 |
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LT4 M6
Drives: 2018 ZL1 1LE Join Date: Nov 2010
Location: Bloomington, IN
Posts: 1,249
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Every car does it. With a stock engine and mufflers I bet it goes unnoticed.
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