05-20-2020, 06:18 PM | #1 |
Drives: 2018 1SS 1LE Join Date: Jul 2012
Location: Michigan
Posts: 287
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Rough cold start/idol
Finally got to drive my car a little with the PC. Anyone know why the first 60-90seconds is rough and “herky jerky”? After a min or two...it runs great and I can’t duplicate the issue. Only happens on cold starts. Plugs? I’m running PCs Canned tune....for a few more weeks at least.
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2018 SS 1LE—707rwhp, 615rwtq
2009 Pontiac G8 GT—605rwhp, SOLD |
05-20-2020, 08:47 PM | #2 |
Drives: 2016 Hyper Blue 2SS Join Date: Feb 2016
Location: Layton, UT
Posts: 498
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Could be misfiring. I had the same issue where it was rough on cold starts only and then after it calmed down it was fine. I would sometimes get a flashing check engine light indicating misfires. I used hptuners to see what cylinders were misfiring and I had to replace 2 injectors to fix it. I'm not supercharged though so it might not be the same issue.
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2SS Hyper Blue Metallic | A8 | Jet Black Interior | NPP Exhaust
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05-20-2020, 08:53 PM | #3 | |
Drives: 2018 1SS 1LE Join Date: Jul 2012
Location: Michigan
Posts: 287
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Quote:
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2018 SS 1LE—707rwhp, 615rwtq
2009 Pontiac G8 GT—605rwhp, SOLD |
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05-20-2020, 10:01 PM | #4 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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I run 2 steps colder NGK, no issues.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
05-20-2020, 10:17 PM | #5 |
Drives: 2018 1SS 1LE Join Date: Jul 2012
Location: Michigan
Posts: 287
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Does the fact you are significantly more power than me play a factor? Or that I’m running a canned tune? It’s really weird....it only last about one minute and then it runs great.
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2018 SS 1LE—707rwhp, 615rwtq
2009 Pontiac G8 GT—605rwhp, SOLD |
05-21-2020, 07:00 AM | #6 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,751
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What plug gap are you running? Very tight plug gaps tend to make cold starts & idling funky.
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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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05-21-2020, 08:10 AM | #7 |
Drives: 2018 1SS 1LE Join Date: Jul 2012
Location: Michigan
Posts: 287
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I did what the manual said....035.
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2018 SS 1LE—707rwhp, 615rwtq
2009 Pontiac G8 GT—605rwhp, SOLD |
05-21-2020, 08:25 AM | #8 | |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,225
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Quote:
I retune hundreds of procharger cars and everyone is much happier after I get done. Give me a call I will get you headed in the right direction.203-753-7223 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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05-21-2020, 11:13 AM | #9 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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power is irrelevant...my guess is it's the canned tune.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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