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Old 12-29-2012, 04:26 PM   #1
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Exclamation What causes a cylinder 5 misfire

My cel came on, went to autozone they diagnosed it as a cylinder 5 misfire. Also did an onstar diagnostics..they said multiple misfires what can cause this? How can it be fixed?? My car was in the shop for 4 months while I was deployed. Now I come back to this can it be fuel injectors or something? Help! I want to enjoy her lol
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Old 12-29-2012, 05:58 PM   #2
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check the plug and wire?
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Old 12-29-2012, 06:18 PM   #3
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If I do check it, what would I have to look for??
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Old 12-29-2012, 06:37 PM   #4
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Quote:
Originally Posted by usmc-ashton View Post
If I do check it, what would I have to look for??
Make sure plugs aren't cracked and that the plug wire is fully engaged in both ends (clicking into place)

Happened to me before
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I wonder if this could be why my car idles like its retarded...
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Old 12-29-2012, 06:47 PM   #5
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At what RPMs did the misfire happen?
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Old 12-29-2012, 07:01 PM   #6
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You dont really feel a misfire but around 2,000 rpms when you try to do a hard acceleration it'll kinda..well..it just won't pick up like before..and my wires seem fine there in properly. I hope it's nothing serious :(
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Old 12-29-2012, 07:26 PM   #7
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The reason i asked it sounds similar to what i had. when they ran the code it should have told them at what rpms the misfire happened. mine would misfire at about 3000 rpms on the 3rd cylinder. it was not misfiring under 3000 so it was very hard to diagnose. dealer had mine for 2 days tyring to figure it out, even gave it back to me 2 times thinking they fixed it. what finally fixed it was we switched the coils around....so im thinking bad connection maybe... they did put some updates on the computer and one updated rerouted the wiring harness. So not 100% sure what fixed it but that was 10,000 miles ago and all good.
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Old 12-29-2012, 08:45 PM   #8
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On a different car, not my Camaro, but I had misfire cylinder #3 on the diagnostic tool. Turns out the end of the spark plug that meets up with the wire harness came undone, like it wasn't screwed in all the way, which I never knew it could do (autolite spark plug). I changed out all the plugs to Bosch and it has been fine since.

Spark plugs are cheap, easy place to start.
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Old 01-01-2013, 06:56 PM   #9
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misfire? a plug misfire or an injector misfire? Code would me most helpful. Setting for a little bit may be the key - fully charge the battery, run injector cleaner through it, and if it is still there let the dealer figure it out - cheapest in the long run instead of chasing parts.
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Old 01-01-2013, 07:05 PM   #10
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I'd take it to the dealer. Many possible causes from simple to ... needs a new motor. Only way to tell will be to have a technician diagnose it.

A friend of mine went through some misfire problems with an LLT. One dealer farted around with it trying top engine cleaning, a few other things... then another dealer fixed it right by - replacing the engine. Really no way to know until a skilled technician looks at it. There are several bulletins for things to look for ... from minor to order a new engine.
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Old 01-02-2013, 12:05 PM   #11
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Take it to the dealer, there is a re-flash for this.
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Old 01-02-2013, 02:37 PM   #12
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Quote:
Originally Posted by TooCool5 View Post
Take it to the dealer, there is a re-flash for this.

Do you happen to know the TSB to reference for this? I experienced a rough idle/CEL this morning that I believe is related to the weather. A phone call to the service tech resulted with nothing.

If I have a TSB # to give him (and the document number #2542524 referenced in another thread was not a legit TSB number, at least to him) It would greatly help my case.
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Old 01-03-2013, 08:05 PM   #13
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Do you happen to know the TSB to reference for this? I experienced a rough idle/CEL this morning that I believe is related to the weather. A phone call to the service tech resulted with nothing.

If I have a TSB # to give him (and the document number #2542524 referenced in another thread was not a legit TSB number, at least to him) It would greatly help my case.
Its SB PI 0284.
Let us know how it works out.
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Old 01-07-2013, 10:41 PM   #14
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Its SB PI 0284.
Let us know how it works out.

The strangest thing happened.... my CEL light turned off before the shop could look at it. Guess I'll have to wait for it to happen again, IF it happens again.

I had the codes read at Autozone. Random misfires, Misfire in Cyl 01,04,06. Only happened once after letting it sit for a few days when we got a bunch of snow.
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Old 01-08-2013, 11:10 AM   #15
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Its an anomaly in the software that usually happens in cold weather.
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Old 01-09-2013, 03:51 PM   #16
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Mine was a broken valve spring.
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Old 01-14-2013, 02:45 PM   #17
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CEL -> P0301, P0303, P0305

2011 v6 had been on the highway ~30 min in December when all hell broke loose - CEL and huge loss of power. 1st exit off to a gas station, let her sit for 10 min, started - CEL was off and she ran like always. Took her to Autozone - OBD showed P0301, P0303, P0305. I was below 1/4 tank - any idea how low the fuel level needs to be to induce this? Should I be asking the dealer to re-FLASH?
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Old 01-14-2013, 11:05 PM   #18
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I have a l99 but i had a plug wire do this intermittent on #6 plug wire they replaced it and haven't had a problem since. Hope it helps.
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Old 01-15-2013, 01:26 PM   #19
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Quote:
Originally Posted by burnn1 View Post
2011 v6 had been on the highway ~30 min in December when all hell broke loose - CEL and huge loss of power. 1st exit off to a gas station, let her sit for 10 min, started - CEL was off and she ran like always. Took her to Autozone - OBD showed P0301, P0303, P0305. I was below 1/4 tank - any idea how low the fuel level needs to be to induce this? Should I be asking the dealer to re-FLASH?

You may want to get a diagnosis with a dealership to make sure everything checks out okay. Please let us know if you decide to do this.

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Old 01-16-2013, 12:10 PM   #20
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Same issue with another starting on post #6 in thread below:

http://www.camaro5.com/forums/showthread.php?t=267680
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Old 02-14-2013, 12:52 PM   #21
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I am at the dealer now because CEL light came back on 3 months later.
It shows same codes (P301, P303. P305) happening less than one month ago - I've had no loss of power in the past month - the light came on a week ago - thought it might have been the K&N replacement filter I dropped in a few weeks ago
They cleared the codes and asked me to take it home.
I asked about SB PI 0284 - they this SB doesn't exist.
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Old 02-14-2013, 01:18 PM   #22
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I just recently had the same experience. I was getting misfire on cylinder 1 and turned out to be a stuck lifter which ended up eating cam up. I'm supposed to pick it up today. They replaced all the lifters and new cam.

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Old 02-14-2013, 02:20 PM   #23
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Quote:
Originally Posted by burnn1 View Post
I am at the dealer now because CEL light came back on 3 months later.
It shows same codes (P301, P303. P305) happening less than one month ago - I've had no loss of power in the past month - the light came on a week ago - thought it might have been the K&N replacement filter I dropped in a few weeks ago
They cleared the codes and asked me to take it home.
I asked about SB PI 0284 - they this SB doesn't exist.
PI0284 per doc. 2542524 Misfire Data Driveability
Its on my dealer paperwork.
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Old 04-03-2013, 02:16 PM   #24
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Originally Posted by TooCool5 View Post
Its SB PI 0284.
Let us know how it works out.
Hey there TooCool5, I have the same ongoing Misfire, and CEL issue on my 2011 Camaro V6. always when its cold out, the ECM seems to trigger the delivery of excess fuel, car missfires, pukes black liquid out of the pipes and throws the misfire code.

Dealer did the de-carbon thing according to a tsb, but frankly that has nothign to do with the misfire as far as im concerned.

My dealer too (Canada) tells me the SB PI 0284 does not exist.

I searched the web for hte GM TSB's and I cant find it either.

Anyway to scan a copy of your work order (all the confidential parts blocked of course) so I can show the dealer that it does indeed exist.

or

Any idea if a general reflash of the ECM would achieve the same thing ?

thanks in advance
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Old 05-18-2013, 06:17 PM   #25
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I had the issue of misfire one morning and the dash lit up like a Christmas Tree. Took it in and dealer said no. 6 fuel injector went bad. They replaced under extended warranty and had my baby back next day.
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