06-28-2016, 05:25 PM | #15 |
Drives: 05 GTO Join Date: May 2015
Location: Weatherford, Texas
Posts: 390
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I would replace the spark plug myself so I know it's been changed IMO.
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06-28-2016, 05:59 PM | #16 | |
WHAT RED LIGHT?!
Drives: 2011 Black Camaro 2SS/RS M6 Join Date: Apr 2011
Location: Miami, Florida
Posts: 1,115
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Possible causes - Faulty spark plug (s)* - Faulty ignition coil (s)* - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure Alot of possible causes, but you can probably check for an intake air leak yourself. Also, you could possibly have a faulty sensor...Too many possibilities to really get to the bottom of it over the web, but this is a start.
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06-28-2016, 06:21 PM | #17 |
Drives: 2018 1SS M6 Join Date: Nov 2014
Location: Houston
Posts: 2,617
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Try a different dealership. Maybe even a Cadillac dealership, they have experience with these engines. Point is some service dept are better than others.
A 300 code is misfire code, but how did they determine cyl 3? I had a coil pack go out on my old pre di caddy, and was a 303 code, meaning misfire cyl 3. |
06-28-2016, 10:47 PM | #18 |
BUMBL Z
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Could be stupid, but if you have a code reader, swap the plug wires with a known functioning cylinder. Recheck codes. If the misfire moved to that cylinder, bad plug wire
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Sold: 2010 2SS, some bolt ons, 415rwhp/400rwtq |
06-29-2016, 10:58 AM | #19 |
Drives: 2010 Camaro 1LS 3.6 LLT V6 325 HP Join Date: May 2009
Location: LS
Posts: 4,242
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Did you try this?
http://www.camaro5.com/forums/showth...light=chemtool
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06-29-2016, 11:34 AM | #20 | |
Drives: GM Vehicles Join Date: Jun 2010
Location: Michigan
Posts: 9,328
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We're very sorry to hear that this concern continues after years of visiting the dealership, and we understand how frustrating and time consuming multiple trips can be. While we recognize that you’re seeking advice from other forum users before taking it back in, please know we’d be happy to help if you decide to do so. Please feel free to private message us if you would like an additional layer of support. Best, Lauren E Chevrolet Customer Care |
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06-29-2016, 12:59 PM | #21 |
Drives: 2016 SS Join Date: Jun 2011
Location: Newark, NY
Posts: 1,283
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My misfires ended up not being cured until they did a complete valve job under warranty. Really needed to clean the crap off the intake valves and the "top end clean" wasn't enough. Yes, it was ok for a couple months or whatever, but I was also getting cat failures / codes and they were replaced under warranty as well. Once the valve job was done, everything has been fine. To be clear, the dealership sent my heads out to a machine shop for steam cleaning, and the shop wouldn't steam clean without also doing a valve job, so my dealership / chevy covered all of it.
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Last edited by Flashpoint135; 06-29-2016 at 03:45 PM. |
06-29-2016, 04:49 PM | #22 | |
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06-29-2016, 04:51 PM | #23 | |
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06-29-2016, 04:55 PM | #24 | |
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06-29-2016, 05:23 PM | #25 |
FIY P0300 is a random multiple cylinder misfire.
which means the ECU cannot determine which cylinder is misfiring or why. otherwise it would state the cylinder number, i.e. P0301, P0302,P0303 etc.. the ecu has extremely good algorithms built in for failed coils, injectors, blown plugs among a million other variables... what it cant determine is external variables. an exhaust leak bad enough for the knock sensor to picking it up will cause this code. or something is rattling at a very specific frequency triggering the random misfire. i.e. only happens at a certain RPM or speed. do you have headers? check header bolt torque. 18ft/lbs if my memory serves me right. check for worn engine mounts anything loose that could be hitting the chassis or engine. among other things to check that have already been discussed is plugs wires coils injectors. but again the ecu is very good at recognizing any of the items above. |
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06-29-2016, 06:08 PM | #26 | |
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06-29-2016, 06:28 PM | #27 |
old school chevy rodder
Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012
Location: Oregon
Posts: 5,587
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As a fellow car enthusiast..Bummer, I would make it to a different shop and make sure they are using the real deal cleaning the carbon with a machine that injects chemicals at the right time and does the job for all the engine, and check and replace all that sides spark plugs checking their condition inspect all coil connections on that side and look for the condition of anything that could be showing buildup/wear. If you do not have a catch can investing in one may be a good idea. things that get old over time like O2 sensors and others can be a problem throwing codes that make you look elsewhere.
I too would check the headers bolts as aluminum expands and contracts a lot more than steel and bolts coming loose are a old problem form the advent of aluminum engines. Heck old chevy luvs that had aluminum engine heads would walk the bolts out of their little hemispherical heads until they were all just loose as heck..... and cleaning the valves at one place can be spraying carb cleaner down the throttle body......and at others they have invested thousands in to state of the art machines. I would worry about the condition of the affected cylinders but if the feeling is not there that its actually misfiring it could be a erratic short somewhere in a plug wire or coil wire connection. I would unclip and re-clip the coil wires check the grounds to the fuel injection especially. Good Luck!
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06-29-2016, 06:36 PM | #28 | |
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2ls, help me please, misfire, service, v6 engine |
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