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Old 04-20-2012, 11:51 AM   #1
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Lightbulb Cylinder misfire

I have a 2010 v6 camaro a year ago I put on bbk long tube headers and ever since my check engine light has been on because of the o2 sensors which is common. The past few days in the morning when u first star it up it has ran sluggish so I decided to hook up me code scanner and it says I have a few cylinders that are misfiring. Because my car runs a little rich I'm thinking carbonation build up. Anyone else experience this?
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Old 04-20-2012, 12:14 PM   #2
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Do you have a ghost cam?
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Old 04-20-2012, 12:38 PM   #3
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Do you have a catchcan on? The oil ingestion can cuse all sorts of issues resulting in a misfire. Also, clean your MAF with MAF cleaner.
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Old 04-20-2012, 03:23 PM   #4
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Quote:
Originally Posted by cjon9657 View Post
I have a 2010 v6 camaro a year ago I put on bbk long tube headers and ever since my check engine light has been on because of the o2 sensors which is common. The past few days in the morning when u first star it up it has ran sluggish so I decided to hook up me code scanner and it says I have a few cylinders that are misfiring. Because my car runs a little rich I'm thinking carbonation build up. Anyone else experience this?
Are you experiencing any rough idle when you first start the car? Or also known as during "cat warm up mode"

If your answer is no then make sure your coil plugs are not loose, check your spark plugs, and do a routine cleaning of your fuel system and perform top engine cleaning with either seafoam or GM TEC(gm top engine cleaner), and as above stated clean your maf. Check your TB for build up too.

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Old 04-20-2012, 04:29 PM   #5
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Rough idle only happens at start up
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Old 04-20-2012, 06:02 PM   #6
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Look like you are experiencing cat warm up cycle misfires. This is a very well known issue that is a real PITA. Just ask the LNF guys and they will tell you all about it. The crazy thing with this is that some have this problem appear overtime and some never. I am one of the unlucky one's that started having this problem around 18k miles. GM realized that this is a problem finally and now they have a TSB reflash for misfire issues. There are a few V6 guys that already got the reflash due to the same problem but it look like there are couple that's still having this problem even after the reflash. If you are tuned you can have the cat warm up mode turned off, but if you are not tuned than simply take the car to the dealer and have them reflash the problem and hope that your car will never have the problem again. Some LNF guys found out that the teflon seal on these direct injected fuel injectors would get burned out and deteriorate over time if you was using e85. I happen to be one of those guys that was using ethanol so that will be my last check or it will have to be turned off unless I just decide to live with 20-30 seconds of cammed like idle and frequent CEL clearing. Keep us posted

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Old 04-20-2012, 06:07 PM   #7
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Old 04-20-2012, 06:23 PM   #8
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I had the same problem when I took mine out of storage I kept getting missfires from bad gas. I did put stabil in before I stored it but idk. I went to the dealership they just told me to put dry gas in it and they cleared the code for me. It has been fine since and that was o 3 weeks ago?
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Old 04-20-2012, 06:55 PM   #9
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Quote:
Originally Posted by cjon9657 View Post
I have a 2010 v6 camaro a year ago I put on bbk long tube headers and ever since my check engine light has been on because of the o2 sensors which is common. The past few days in the morning when u first star it up it has ran sluggish so I decided to hook up me code scanner and it says I have a few cylinders that are misfiring. Because my car runs a little rich I'm thinking carbonation build up. Anyone else experience this?
carbonation build up? did you dump a coke in your tank or something?
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Old 04-20-2012, 10:11 PM   #10
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I had the same problem when I took mine out of storage I kept getting missfires from bad gas. I did put stabil in before I stored it but idk. I went to the dealership they just told me to put dry gas in it and they cleared the code for me. It has been fine since and that was o 3 weeks ago?
dry gas is basically the same formula thats in seafoam or techron fuel system cleaner right? I tried both still no go. different gas stations, no go. checked everything I could check and is all fine. only thing I didn't check is my fuel injectors. once I do that and if they are fine than I will be back to square one. I guess I will just live with the 20-30 seconds of big a$$ cammed like idle and frequently clearing misfire CEL's or just follow everyone's advise and turn the darn cat warm up mode off, which I still wont be satisfied with either. kjkjr, If your misfire went away with dry gas than I don't think the problem was the actual cat warm up cycle misfire problem. you might of just had a bad batch of gas possibly. If you guys have the real cat warm up bug, dry gas wont solve that LOL.

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Old 04-21-2012, 08:56 PM   #11
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What I don't understand is it only acts up at cold start first thing in the morning. I notice no misfiring while I'm driving or loss of power and it does not do it at any other cold start thru ought the day.
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Old 04-21-2012, 09:27 PM   #12
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What I don't understand is it only acts up at cold start first thing in the morning. I notice no misfiring while I'm driving or loss of power and it does not do it at any other cold start thru ought the day.
That's what make this problem such a PITA to deal with. its only for that first 20-30 seconds than everything is fine after that. A dealer reflash supposed to fix the problem so give it a go and see how it work out.

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Old 04-21-2012, 09:34 PM   #13
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what a bizzare PITA, you and Bmore seem to have the same issue. I hope you get it worked out. I guess the silver linning is it is only for 20-30 seconds and not all the time.

Be curious if the reflash solves the issue.
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Old 04-21-2012, 09:55 PM   #14
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GM is aware of this issue and the TSB "supposed" to fix the problem. I only know of two members that are still having issues after the reflash so they possibly could of had other issues unrelated to cat warm up misfire. The rest of the peoples that had the problem seem to be good after the reflash. I just wish I knew what is the reason behind this. This problem go back years, even affecting other brand of cars that has cat warm up cycle on cold start up. Within the GM cars, this problem exist from caddy's, all LNF, and even holden commodores.

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Old 04-22-2012, 09:48 AM   #15
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What I don't understand is it only acts up at cold start first thing in the morning. I notice no misfiring while I'm driving or loss of power and it does not do it at any other cold start thru ought the day.
I had a multiple misfire CEL pop up once during startup two winters ago. It was cold as shit. Like 4 degrees.

This leads me to believe my problem was different from what you guys are going through.

The dealer told me there is new software for really cold starts. Something about raising the choke rpm during the cat warmup phase. So the engine doesn't bog down during the really cold starts.

Take it to the dealer. Describe what is happening. Hopefully they can help you despite having Longtubes.
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Old 04-23-2012, 10:42 AM   #16
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My car does the same thing only when it is below 20 degree's out.

Now that spring is here it is smooth as silk on cold starts.

Re flash did not correct my cold start rough idle.
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Old 04-23-2012, 10:45 AM   #17
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My car does the same thing only when it is below 20 degree's out.

Now that spring is here it is smooth as silk on cold starts.

Re flash did not correct my cold start rough idle.

All cars have a rough idle when started when its below 20 degrees out. The reflash is supposed to fix the cylinder misfire CEL. Question is do you get a cylinder misfire CEL after the reflash?
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Old 04-23-2012, 05:50 PM   #18
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Had the cold start misfire problem about 4 months ago. Took it in they did the reflash and has been fine since then.
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Old 04-23-2012, 06:45 PM   #19
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I really wish I knew what it is that they exactly change in the reflash so I can get vince to tweak mine for me:(

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Old 04-23-2012, 06:50 PM   #20
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Im going to try to get a video of my car at start up in the morning if i can remember.
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Old 04-23-2012, 07:57 PM   #21
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Im going to try to get a video of my car at start up in the morning if i can remember.
does your idle bounce up and down with rough idle in the morning? I always don't get a misfire but is definitely not a normal rough idle either. This thing sound like it has a big arse cam in it for that 20-30 seconds. I'm going to try to get a video too for you guys.

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Old 04-23-2012, 08:02 PM   #22
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Yes it does bounce up and down at idle. I just got done cleaning my mass air flow sensor and it has ran better than ever. BUT i wont really know until first thing in the morning.
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Old 04-23-2012, 08:03 PM   #23
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Knock on wood.
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Old 04-23-2012, 08:23 PM   #24
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Sound like we have the same issue brother LOL. I did all that. From cleaning my maf to seafoam. It would act like its running fine but it all comes back. I think its more of a mind thing after when we change our oil and clean the maf and such, who knows

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Old 04-23-2012, 08:46 PM   #25
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haha you are probably right.
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