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Old 06-02-2013, 10:31 AM   #1
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Cylinder #5 misfire, oily spark plug....

I've been throwing a code for cylinder #5 misfiring under heavy load.

I checked on some CTS forums to find that the drivers side cylinder order is 1-3-5. So I pulled my plugs just now, here they are in that order, and whatdayaknow? Plug #5 looks funny. Has some oily residue, not a lot, but enough to come off onto the mircofiber. Its not dripping.

Am I off to the dealer? Or is this just a fouled plug that can be replaced?

Pics are plugs 1-3-5, top to bottom.

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Old 06-02-2013, 10:41 AM   #2
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I would go out to autozone and buy a new one, pretty sure they sell them there, just make sure to write down that brand and number on the plug down. That oil seems to be causing the issue.
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Old 06-02-2013, 11:15 AM   #3
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I would go out to autozone and buy a new one, pretty sure they sell them there, just make sure to write down that brand and number on the plug down. That oil seems to be causing the issue.
Its definitely the oil, I'm just wondering if a new plug solves the issue or do I have an issue causing the oil?
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Old 06-02-2013, 11:36 AM   #4
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Its definitely the oil, I'm just wondering if a new plug solves the issue or do I have an issue causing the oil?
Not sure. Only 1 way to find out haha.

According to amazon the iridium plugs (think that is the one our cars have) are 7 bucks with a $2 rebate so that would be $5 for one (but you do have to buy atleast 4 to get the $2 rebate on each). I personally would buy them and switch it out and see how it holds up after a couple hundred miles and see.
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Old 06-02-2013, 12:41 PM   #5
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Cleaned the spark plug off, still misfiring. Oil is getting into the cylinder at high load, high RPM pulls. Off to the damn dealer for I don't know how many times now.
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Old 06-02-2013, 12:46 PM   #6
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That's not good, good luck!
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Old 06-02-2013, 01:02 PM   #7
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That's not good, good luck!
Thanks man, this is extremely frustrating! Nothing is going right for my car right now. Its not running right and on top of that my new bumper set up has been delayed over 2 months now!
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Old 06-02-2013, 01:03 PM   #8
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New bumper? Do tell.
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Old 06-02-2013, 01:06 PM   #9
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New bumper? Do tell.
Modified SS bumper, it will be one of a kind once its done muhahahaha SHOULD be ready within 2-3 weeks but we'll see. Priority is getting this damn thing running right.
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Old 06-02-2013, 01:18 PM   #10
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Modified SS bumper, it will be one of a kind once its done muhahahaha SHOULD be ready within 2-3 weeks but we'll see. Priority is getting this damn thing running right.
Nice , still not sure what I wanna do with my front bumper have a lot of diff ideas lol.
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Old 06-02-2013, 01:24 PM   #11
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How about replacing the number 1 or 3 plug with the number 5 plug. See if number 5 is still misfiring or if the one you replaced it with, is misfiring.
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Old 06-02-2013, 01:30 PM   #12
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those plugs look worn..triangle-shaped, when new they are cylindrical..
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Old 06-02-2013, 06:44 PM   #13
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That plug 5 doesn't look right. Have you tried to put that plug into another cylinder and see if it causes the misfire to happen on the cylinder that you switched the plug to?

Also I don't remember but are you running the stock tune?
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Old 06-02-2013, 10:55 PM   #14
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That plug 5 doesn't look right. Have you tried to put that plug into another cylinder and see if it causes the misfire to happen on the cylinder that you switched the plug to?

Also I don't remember but are you running the stock tune?
Its tip was the same as the others, just oil on the thread. Cleaned it off nice and it looked just like the others, still misfires though. I didn't bother changing it. After talking to Tracy, no point is messing around anymore. A tech needs to fix this, I can't keep messing with it, I'm no mechanic.

And stock tune, just basic bolt on car and not many at that.
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Old 06-03-2013, 05:49 AM   #15
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The pointy tips on those plugs are that way from the factory, not wear.
You could double check the gap (0.043) if you have it back out.

Hopefully it's just a faulty coil and not "blow-by" from bad rings.

How many miles and how many Seafoam treatments?

BTW- I thought the passenger side cyl. were labeled 1-3-5 and drivers was 2-4-6 front to back, but I could have it bass-ackward!

Good luck and keep us posted.
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Old 06-03-2013, 07:41 AM   #16
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The pointy tips on those plugs are that way from the factory, not wear.
You could double check the gap (0.043) if you have it back out.

Hopefully it's just a faulty coil and not "blow-by" from bad rings.

How many miles and how many Seafoam treatments?

BTW- I thought the passenger side cyl. were labeled 1-3-5 and drivers was 2-4-6 front to back, but I could have it bass-ackward!

Good luck and keep us posted.
Looking like its blow by...50,000 miles with a rebuild at 9,000 miles. I looked on the cts forums, I'm assuming they oriented the engine the same way in our cars. Who knows though....

I'll keep you guys posted. I'm running numbers on a V8 today. Looks like I can afford it quite safely.
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Old 06-03-2013, 08:17 AM   #17
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I agree oil means a messed up piston ring. But the plug could just be fouled which is why you getting misfire code. I've had oil before on mine with no misfire. Only when my plug was fouled, but get it all checked out.

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Old 06-03-2013, 10:02 AM   #18
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I agree oil means a messed up piston ring. But the plug could just be fouled which is why you getting misfire code. I've had oil before on mine with no misfire. Only when my plug was fouled, but get it all checked out.

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Looks like I pulled the right plugs. My engine has been bburning a quart every 3000-4000 miles and it went 40,000 without a can. My guess is that my rings didn't seat well off the jump, it was probably going to break eventually anyway.
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Old 06-03-2013, 02:10 PM   #19
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I'm running numbers on a V8 today. Looks like I can afford it quite safely.
I've had a blast modifying the V6, but if I had it all to do over again....

I say go for the V8 man, there's no replacement for displacement! With folks holding out for the refreshed 14's, there's bound to be some deals to be had on some 2013's out there.
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Old 06-03-2013, 04:16 PM   #20
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I've had a blast modifying the V6, but if I had it all to do over again....

I say go for the V8 man, there's no replacement for displacement! With folks holding out for the refreshed 14's, there's bound to be some deals to be had on some 2013's out there.
Yeah I think I've made up my mind lol Main priority right now is to get this car fixed 100%

Already hit up my salesman to see what he can do for me.
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Old 06-08-2013, 07:49 AM   #21
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So how is it coming along DarkneSS? Get things worked out on the uptrade yet?
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Old 06-08-2013, 08:57 AM   #22
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So how is it coming along DarkneSS? Get things worked out on the uptrade yet?
Was just about to post about this, I'm in an interesting situation lol

I brought it to the dealer and got it back the same day, they said there was a bulletin out for misfires that required an ECU update . Great and all but I don't think that addresses the oil on the plug that I told them about
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Old 06-08-2013, 09:03 AM   #23
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I would be surprised if it deals with it too. You may have to keep asking the question until they give an answer for it and not dodge around it. My guess would be they have no clue so you are getting the answers about everything but your question.
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Old 06-08-2013, 09:10 AM   #24
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Was just about to post about this, I'm in an interesting situation lol

I brought it to the dealer and got it back the same day, they said there was a bulletin out for misfires that required an ECU update . Great and all but I don't think that addresses the oil on the plug that I told them about
I had this bulletin done for misfires. Doc ID 2542524 It is mainly on start up during cold temps.
Doesn't sound like your problem though.
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Old 06-08-2013, 10:01 AM   #25
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Willing to bet you have rings stuck on that cylinder from being gunked up so if it is allowing to much oil past now, the only way to free them is tear down and re-ring.

Here is a piston w/only 8 k miles (from a LLT).

Look at the buildup in such a short time. It is critical for the rings to seat properly in the first 500 miles, and to also stop the oil ingestion with a proper catchcan system.

Every now and then simply adding a can that catches all, or nearly all the oil and an upper induction cleaning right after will allow the rings to begin to move freely again, but not always. And, only a couple cans catch most of the oil....and the RX is the only one to catch all, or nearly all the oil:

Hey Tracy, Just wanted to thank you, and everyone at RevXtreme. I bought a catch can from you, for my 2005 CTS. Well since installing it i'm not consuming any oil anymore. I've had a close eye on the oil level since i have installed it and it hasn't used a drop. I don't know how or what that catch can has done to prevent the oil consumption. (I've read your tech tips article and understand the concept of how a catch can work.) I guess i am just baffeled that it something so simple like that could work.

Anyway just wanted to thank you. I was at my last wits end with this car and was about to put it back on the market, after the dealer replaced two motors under warrenty.

I'll be purchasing another catch can from you in the future. I have a 2000 Camaro SS that is getting a turbo as we speak, as a fun project street car.

But thanks again. It was definetly worth the wait.

Gabe Moulden
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