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09-22-2019, 11:05 AM
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#1 | |
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Former GM Technician
Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009
Location: Switzerland
Posts: 341
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Colder plugs, bad idle
My car is tuned, lower pulley and they also put Brisk RR14s plugs in it. (gapped between 0.027 and 0.031) Since that the car has a bad idle every cold start. Missing and surging. The colder, the worse.
Here the link to the video took a few weeks ago, check the 29sec, and the 42sec mark:* I changed the plugs today and put the stock ones back in (gapped to factory specs 0.040), to find out if maybe the colder plugs caused this. And sure enough my idle is back to normal. My question now, am I risking burning a hole in my pistons running the stock plugs, or should I better go back to the colder plugs, and suffer a little driveability when cold.
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2018 Camaro ZL1 A10
Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980 Last edited by swisstyphoon; 09-22-2019 at 03:18 PM. |
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09-22-2019, 04:30 PM
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#2 |
     Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018
Location: RGV Texas
Posts: 1,527
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Might want to talk with your tuner about that. I changed my plugs to the NGKs and have had no problems after a good tune. My first tune was not so good. Car would idle low and sound as if it was going to shut down. Then at times the car would buck a bit at certain RPMs. Once I took it to another tuner, it all got corrected and the car is outstanding.
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09-22-2019, 08:46 PM
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#3 |
     
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,808
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put a one range colder NGK in it and everything will be perfect
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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09-22-2019, 08:52 PM
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#4 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,734
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Quote:
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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09-23-2019, 11:02 AM
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#5 |
 
Drives: 2017 ZL1 Join Date: Mar 2014
Location: DFW, TX
Posts: 302
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IMHO, NGK >> Brisk
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09-24-2019, 06:52 PM
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#6 |
Drives: 2023 ZL1 M6 Join Date: Sep 2018
Location: Pace FL
Posts: 416
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That sounds like fueling isnt correct. After it warms up some it goes into closed loop and 02's will correct fueling. If VE table isnt dailed it it will act crazy.
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2024 Riverside Blue ZL1 M6
Magnuson 2650R, NW 103, Roto Fab Big Gulp, ARH 2 inch LT's, Stainless Works NPP Signature Forged 20x10.5/20x11.5, BMR springs, BMR Cradle lockout, AAD Billet Control/Trailing arms 2023 Vivid Orange ZL1 M6 - sold 2019 Riverside Blue ZL1 A10 - sold |
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09-24-2019, 07:14 PM
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#7 |
 
Drives: 2019 2SS Join Date: Mar 2019
Location: WA
Posts: 67
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I found the same problem with various cars over the years.
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09-28-2019, 12:21 PM
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#8 |
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Former GM Technician
Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009
Location: Switzerland
Posts: 341
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Thanks for the input guys, switching to NGKs now.
__________________
2018 Camaro ZL1 A10
Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980 |
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09-28-2019, 01:04 PM
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#9 |
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Account Suspended
Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011
Location: St. Charles, IL
Posts: 18,663
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We run NGK TR7s on the LT4s with a lot of success
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