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03-03-2019, 11:48 AM
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#1 |
    
Drives: 2011 2SS Join Date: Mar 2015
Location: Arlington, Texas
Posts: 1,333
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Help me solve my misfire issue
Hey guys,
I recently relocated my coils and made longer spark plug wires to reach the new location. The wires I made worked fine and didn’t misfire. I then ordered some much nicer wires and after installing those, the car began misfiring. I tested the resistance on the new wires and they’re all about 30 ohms of resistance per foot. After this I went back to the old wires that I had made and the car is still misfiring leading me to believe the issue is not the wires. I didn’t change anything else besides the wires between the time that the car ran fine and when it began misfiring. I’ll double check that all harnesses are connected but is there anything obvious I’m missing? What else should I check for? How would you guys go about diagnosing this?
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2011 SS L99
LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears  |
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03-03-2019, 01:11 PM
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#2 |
    Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,438
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Broken or cracked plug?
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03-03-2019, 01:14 PM
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#3 | |
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Drives: 2011 2SS Join Date: Mar 2015
Location: Arlington, Texas
Posts: 1,333
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Quote:
I wouldn’t think that to be the case because I haven’t messed with any of them, and the car ran fine, I changed the wires, now the car misfires regardless of the wires on it. I’m kind of leaning towards a harness not getting a great connection. My HP tuners VCM scanner isn’t reading misfires either so I don’t know what cylinder(s) it’s misfiring on. I guess I could pull each spark plug and double check just to be safe
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2011 SS L99
LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears |
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03-03-2019, 06:21 PM
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#4 | |
 
Drives: 2018 Camaro 2SS, Hyper Blue Join Date: Jun 2016
Location: Next Level Tuning - Chicago
Posts: 186
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Quote:
Maybe you took something off after the MAF and don't have it sealed well and the car is dumping fuel thinking it's lean. What are your o2 sensors reading? My brother hooked his exhaust on a bump previously and pulled the exhaust apart enough to let air in at the o2 and man did it run bad. Misfire central it felt like with no misfire codes.
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2018 2SS, A8, NAV, NPP, MRC, Sunroof, Hyperblue, LT4 S/C, LT4 Fuel System, RotoFab CAI, Headers, HiFlo Cats
2016 2SS, A8, NAV, NPP, MRC, Sunroof, Hyperblue (GM buyback) 1999 Trans Am Firehawk, M6, headers, no-cats, slp exhaust, hot cam, intake, 3:73 gears. Red/Blk Last edited by BlueCamaro6; 03-03-2019 at 06:22 PM. Reason: added info |
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03-03-2019, 06:56 PM
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#5 |
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Drives: 2011 2SS Join Date: Mar 2015
Location: Arlington, Texas
Posts: 1,333
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So I put the new wires back on and it’s not misfiring. I swear sometimes this car has a mind of its own
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2011 SS L99
LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears |
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