03-16-2014, 04:43 PM | #1 |
Drives: Black 2014 2SS/RS Join Date: Sep 2013
Location: Texas
Posts: 24
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Throttle Response Hesitation
I have a 2014 SS automatic with most of the toys on it and about 8K miles. No mods. I absolutely LOVE this car! One minor thing that is a little annoying at times. It seems that when leaving a stop sign/light in normal driving, there is often a momentary lag in throttle response for about the first 1/2 in. or so of pedal travel, then the engine responds a bit more than I intended for the traffic situation. Makes it hard to take off briskly, but with good smooth control. I haven't taken it in to the dealer yet. Is this a common characteristic or can it be fixed with a PCM update or sensor swap, aftermarket tune, etc.? Anyone had a similar issue? Thanks in advance for any advice.
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03-16-2014, 04:51 PM | #2 |
Buick 455 Fan
Drives: 1970 Buick, 2012 1SS LS3 Join Date: Jun 2010
Location: Boston MA
Posts: 5,957
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if you have a vacuum assisted secondary, you want to check the vacuum can and hoses. maybe a hose is off or the can is cracked. If it's an electric choke you might need to re-set it due to the warmer weather anyway, so do that while you're under there. Then check to see if your secondaries are allowing fuel to pool, and then rebuild the accelerator pump in your carbure....oh wait.
is traction control influencing this?
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03-16-2014, 04:57 PM | #3 | |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
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Quote:
The L99s are kind of known for slow throttle response. Induction upgrades, specifically the throttle body, tend to improve it. Tuning can help as well but you will probably want to avoid that for a while with a brand new car. |
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03-16-2014, 05:29 PM | #4 |
Drives: 2013 Camaro SS Join Date: Nov 2013
Location: Saudi Arabia
Posts: 86
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throttle body?
do tell... |
03-16-2014, 07:15 PM | #5 |
Drives: '12 2SS/RS, '13 Vette, '13 Wrangler Join Date: May 2012
Location: wherever the Navy sends me
Posts: 740
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Its called AFM. The lag is your car changing from 4 to 8 cylinders. Mine did it too until I tuned AFM out.
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2012 Camaro Ashen Grey Metallic 2SS/RS "Timberwolf". Custom exhaust, RX oil catch can and oil breather, CAI inc intake, SLP 160* thermostat, TSP 2" LT headers w/ off road pipes, custom cam, tuned. 467rwhp 450rwtq.
2013 Corvette Torch Red LS3. 378rwhp/375rwtq SAE corrected, tuned. ROCK CHALK JAYHAWK GO KU! |
03-16-2014, 08:49 PM | #6 | |
Drives: Black 2014 2SS/RS Join Date: Sep 2013
Location: Texas
Posts: 24
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Quote:
As the gentleman from the 1960's suggested, could traction control be an issue? I'll try turning it off and see how it affects response. |
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03-16-2014, 09:08 PM | #7 |
Drives: 02 Z06, 95 Trans Am, 2012 ZL1 Join Date: Mar 2012
Location: Southeast
Posts: 1,838
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It's burst knock.
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Bryan 2018 ZL1 M6
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03-16-2014, 09:13 PM | #8 |
Drives: 2011 2SS/RS Vert Join Date: Nov 2013
Location: Florida Panhandle
Posts: 86
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The mpg difference with the AFM turned off is not much of a difference. it depends on your driving habits. some people say they have seen an increase in mpg with AFM turned off. My milage stayed about the same with it off, but the throttle response is night and day diff. The best part is no more farting sound when the AFM kicks in, I hated that sound.
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Gelugon
2011 2SS/RS Vert |
03-16-2014, 09:22 PM | #9 |
Do somethin fun every day
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After checking hoses as suggested my vote is for a VMAX CNC ported throttle body. No tune and if you keep your stock throttle body you can always take it back to stock, for the extra $ of course.
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03-17-2014, 05:19 AM | #10 |
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Get the V-Max TB and get a CAI cold air intake. That will help out allot.
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03-17-2014, 07:28 AM | #11 |
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I don't think it's AFM causing this but regardless, you should get the Range AFM disable device. Best $200 you can spend on a SS/L99 - and it won't void warranty and you can unplug it in a second, should you ever actually want AFM activated.
I do think a V-Max CNC throttle body would help, if not cure, your situation (another well spent $150). Perhaps a fuse pull is in order as well.
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2013 1SS/RS Coupe L99, Stainless Power Works LT Headers, SCT X4 Custom Tune from RDP, CAI Inc. Air Intake w/ Apex Scoop, VMAX CNC Ported Throttle Body, Solo Axle-Back Exhaust w/ J-pipes, Apex Catch Can, Husky Splash Guards, Heritage Grille, 3D Carbon Rear Spoiler, Oracle Chrome Turn Signal Bulbs, GM Reverse Light Trim Billets, Gorilla Black Locking Lugs, Emblem Pros Retro SS Badges/Custom Retro SS Kickplates/Under-hood Bowtie, 35% window Tint, Nitto Motivo Tires (6-8-18)
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03-17-2014, 07:40 AM | #12 |
B.O.D. 02/16/10
Drives: 2010 SGM Sp. Edition 2017 RS Conver Join Date: Jun 2010
Location: Albia,Iowa
Posts: 3,959
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ported throttle body took care of that problem in my V6.
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03-20-2014, 11:52 AM | #13 |
Wind Rider
Drives: ZL1 19 White; Jeep 5.7 GC 15 Join Date: Jan 2010
Location: Muscat
Posts: 2,059
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I know that AFM virus is common in L99, what is the best tune available now to disable it and gives the best performance overall.
I dont have a plan to add mods to my car.
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03-21-2014, 09:58 AM | #14 | |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,218
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Quote:
Some will cause problems without Proper Custom tuning, which JRE can provide. Ted.
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Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com |
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