08-25-2022, 08:49 PM | #1 |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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P0304 Code
Hello,
Got in my 2013 L99 today and the CEL started flashing with a little roughness to the engine. It goes off, flashes, goes solid. Stabil trac lights all came on too, they went off once, but mostly stay on. Eventually throws a P0304 code. Car shakes, domelight dims a little with the shake. -Switched spark plug wires between cyl 2 and 4, reset CEL, still throws a P0304. Sparkplugs are less than a year old. -Then Swapped plugs, coil, and wires between cyl 2 and 4, still throws a P0304. -Plug 4 did look to have more carbon than plug 2 before the switch -Battery seems good with voltmeter I have a tune that turns AFM off. Those flaps in my exhast pipe towards the end...the driver side one seems to shake with all this. I did get on the gas pretty good for a brief moment while getting on the freeway. Started happening after that. Only drove a couple of miles. Its my daily driver with over 150k miles. Any ideas? Thanks. Last edited by jlsat3; 08-25-2022 at 10:57 PM. |
08-26-2022, 08:41 AM | #2 |
Drives: 2014 Camaro 1LT Join Date: Aug 2019
Location: Central Florida
Posts: 372
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I'm no mechanic, so just throwing out ideas here, but I wonder if it is the fuel injector? You swapped out the coils and plugs and are still seeing a misfire on cylinder 4.
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08-26-2022, 05:56 PM | #3 |
Drives: 2011 SS-RS Join Date: May 2011
Location: FLORIDA
Posts: 11,435
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Check your connectors for that cylinder, unplug it and look at the wires and pins. I have read on her a while ago that someone had an issue with the wiring on one injector, fixed it and the problem went away. Sometimes one of the wires will get too hot and burn thru, or cause a pin malfunction. GL..
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08-26-2022, 10:06 PM | #4 |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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I'm Stumped....
Switch fuel injectors between 2 & 4, still same code. Took spark plug out on 4 and ran engine, the plug sparks. So... -Plug Fires (not plug, not coil, not wire) -Has carbon, so fuel is getting in? (not injector?) Any help is appreciated. Maybe I need to check compression. |
08-27-2022, 04:12 PM | #5 |
Drives: 2011ss/rs camaro Join Date: Sep 2011
Location: florida
Posts: 1,261
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Compression?
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08-28-2022, 08:52 PM | #6 |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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I don't know. Was thinking maybe something is wrong with my valves.
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08-29-2022, 02:47 PM | #7 | |
Drives: 13 CAMARO 2SS LS3-04 SILVERADO LS3 Join Date: Dec 2021
Location: SOUTHERN MARYLAND
Posts: 802
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Quote:
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08-29-2022, 05:10 PM | #8 | |
The ? And the answer
Drives: 2010 2SS SIM M6 Join Date: Jan 2016
Location: Cali
Posts: 148
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Quote:
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08-30-2022, 12:03 AM | #9 | |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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Quote:
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08-30-2022, 06:52 AM | #10 |
Drives: 13 CAMARO 2SS LS3-04 SILVERADO LS3 Join Date: Dec 2021
Location: SOUTHERN MARYLAND
Posts: 802
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If one of the rockers are not moving then the head will have to come off and that lifter will need to be replaced. If I'm doing it, I replace all 4 of the afm lifters while I have the head off. Compression is a good indicator of cylinder condition but keep in mind that if the exhaust lifter is collapsed you will still have compression on your gauge. As easy as the valve covers are to remove, I'd check your rocker arm movement first.
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09-02-2022, 03:05 PM | #11 |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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All the rockers move
Last edited by jlsat3; 09-05-2022 at 02:00 PM. |
09-05-2022, 02:01 PM | #12 |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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Finally checked compression in 2 & 4. They are both good.
One thing that also happens is a lot of white smoke in start up and rev. |
09-05-2022, 02:58 PM | #13 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,155
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Did you check other cylinders to compare to?
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09-05-2022, 03:39 PM | #14 |
Drives: 2013 Camaro Join Date: Mar 2016
Location: Ventura
Posts: 49
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