Engine Misfire when cold, Check Engine Light - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

TooCool5 · 01-19-2011, 10:45 AM

OK so its about 10 degree's out and I start my Camaro to warm and charge it up and my LLT V6 engine is jumping really bad. Couldn't be good for the timing chain.
Then the idle comes down, engine smoothed out and I get the MIL lit up.
I remember there was a service bulletin for this (P10284) and I set DTC P0306 cylinder 6 misfire.
Forecast is for daytime highs only in the 20's.
No big deal, its off to the dealer for a re-flash of the ECU computer.
I'll have to wait for the roads to dry out and the salt to dust off them though.
Here are some pics.

larryt1026 · 01-20-2011, 08:22 AM

Oh man..hope your car gets fixed up soon. How did you hook up your laptop to the car like that? What would you need to run something like that?

TooCool5 · 01-20-2011, 10:51 AM

Quote:

Originally Posted by larryt1026

Oh man..hope your car gets fixed up soon. How did you hook up your laptop to the car like that? What would you need to run something like that?

You can hook your laptop up by getting a USB diagnostic cable, and it comes with the software to read multiple vehicle OBDII platforms.

TooCool5 · 01-23-2011, 04:23 PM

The roads finally dried up, bringing my Camaro in tomorrow for the re-flash.

Update:
May have not been a problem after all. I put dry gas in the car as it is below
zero out.
Car started and ran smooth as a button in the bitter cold. So I asked the Dealer
if I have you re-flash the computer could it effect gas mileage? Service manager said
it could as they probably enriched the mixture in the new program.
So I decided to ask my Camaro5 friends who had the re-flash done.
Can anyone chime in, has it effected mileage, any other changes you have noticed?

vinman · 03-26-2011, 10:01 AM

Quote:

Originally Posted by TooCool5

You can hook your laptop up by getting a USB diagnostic cable, and it comes with the software to read multiple vehicle OBDII platforms.

How much, where did you get it, does it void the warranty?

TooCool5 · 03-26-2011, 10:11 AM

Got it on Ebay for under $20.
I don't use it to change anything or delete codes, just read them.
Check with the dealer on the warranty question, when I brought it in they read the same codes and cleared them for me with no issues.

transamguy · 03-26-2011, 07:04 PM

the check engine light is a common problem for V6's in the cold i had the issue about 6 times over the winter GM has no fix for it so far

TooCool5 · 03-27-2011, 01:02 PM

Quote:

Originally Posted by transamguy

the check engine light is a common problem for V6's in the cold i had the issue about 6 times over the winter GM has no fix for it so far

There is a fix......

transamguy · 03-27-2011, 03:15 PM

Quote:

Originally Posted by TooCool5

There is a fix......

i did read the thread the dealer had reflashed mine way back in december, the problem came back and so far there is no fix yet from gm canada the problem occurs with all of the 3.6L v6s so it is being adressed my car however did not experience any signs of a miss fire no jumping around as you put it, i think we may have had two seperate problems

TheHorse13 · 03-28-2011, 12:18 PM

I hate to hijack the thread but could you link me to the exact OBDII item you bought on EBAY please? I'd love to have one of these handy.

Thanks.

TooCool5 · 03-29-2011, 10:17 AM

Quote:

Originally Posted by transamguy

i did read the thread the dealer had reflashed mine way back in december, the problem came back and so far there is no fix yet from gm canada the problem occurs with all of the 3.6L v6s so it is being adressed my car however did not experience any signs of a miss fire no jumping around as you put it, i think we may have had two seperate problems

I think I had water in the gas or a valve hanging up in #6, but the dealer found 5 or 6 codes set when they scanned it.
http://www.camaro5.com/forums/showthread.php?t=136285

Quote:

Originally Posted by TheHorse13

I hate to hijack the thread but could you link me to the exact OBDII item you bought on EBAY please? I'd love to have one of these handy.

Thanks.

Here is a link, just make sure it is compatible with your PC operating system.

http://cgi.ebay.com/OBDII-OBD-II-2-O...item5643528484

TheHorse13 · 03-29-2011, 12:58 PM

Thanks for this!

jls · 03-29-2011, 05:52 PM

Back in Feb. on a cold -11 day car shook like crazy on start up, shut down and restarted it was ok except check engine light. multiple codes p1380 (miss fire detected , rough road data not aviable)po300 to po600 (missfire detected all 6 cylinders) GM addressed this concern with document #2542524- updated calibration is aviable for the engine controle module. The ecm was reprogramed nd I have not had that condition since. Hope this was helpful.

Merk247 · 03-29-2011, 07:03 PM

i believe and as far as i can diag most often this issue is a result of a fuel blend mismatch/poor fuel. winter blend fuels have a composition to better burn in colder temps so poor gas quality or not as many agents in the fuel causes poor ignition of the fuel and misfires. your gas mileage shouldnt drop as warm up open loop fueling differs form while your driving plus summer blend fuels should be coming out which allow better mileage..

01-19-2011, 10:45 AM	#1
TooCool5 Drives: 2010 Camaro 1LS 3.6 LLT V6 325 HP Join Date: May 2009 Location: LS Posts: 4,244 View My Garage	Engine Misfire when cold, Check Engine Light OK so its about 10 degree's out and I start my Camaro to warm and charge it up and my LLT V6 engine is jumping really bad. Couldn't be good for the timing chain. Then the idle comes down, engine smoothed out and I get the MIL lit up. I remember there was a service bulletin for this (P10284) and I set DTC P0306 cylinder 6 misfire. Forecast is for daytime highs only in the 20's. No big deal, its off to the dealer for a re-flash of the ECU computer. I'll have to wait for the roads to dry out and the salt to dust off them though. Here are some pics. __________________ 2010 Camaro Auto, Inferno Orange, Titanium Interior, Gearhead Wheels AIRAID CAI

01-23-2011, 04:23 PM	#4
TooCool5 Drives: 2010 Camaro 1LS 3.6 LLT V6 325 HP Join Date: May 2009 Location: LS Posts: 4,244 View My Garage	The roads finally dried up, bringing my Camaro in tomorrow for the re-flash. Update: May have not been a problem after all. I put dry gas in the car as it is below zero out. Car started and ran smooth as a button in the bitter cold. So I asked the Dealer if I have you re-flash the computer could it effect gas mileage? Service manager said it could as they probably enriched the mixture in the new program. So I decided to ask my Camaro5 friends who had the re-flash done. Can anyone chime in, has it effected mileage, any other changes you have noticed? __________________ 2010 Camaro Auto, Inferno Orange, Titanium Interior, Gearhead Wheels AIRAID CAI Last edited by TooCool5; 01-24-2011 at 01:44 PM. Reason: Update:

03-29-2011, 07:03 PM	#14
Merk247 Drives: 2003 Subaru wrx Join Date: Mar 2011 Location: Upstate Ny Posts: 4	i believe and as far as i can diag most often this issue is a result of a fuel blend mismatch/poor fuel. winter blend fuels have a composition to better burn in colder temps so poor gas quality or not as many agents in the fuel causes poor ignition of the fuel and misfires. your gas mileage shouldnt drop as warm up open loop fueling differs form while your driving plus summer blend fuels should be coming out which allow better mileage.. __________________ ASE MASTER TECH GM TECH DRIVETRAIN/DIESEL SPECIALIST

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01-20-2011, 08:22 AM	#2
larryt1026 Drives: 2011 Camaro LT Join Date: Jun 2010 Location: Jacksonville, FL Posts: 575	Oh man..hope your car gets fixed up soon. How did you hook up your laptop to the car like that? What would you need to run something like that?

03-26-2011, 10:11 AM	#6
TooCool5 Drives: 2010 Camaro 1LS 3.6 LLT V6 325 HP Join Date: May 2009 Location: LS Posts: 4,244 View My Garage	Got it on Ebay for under $20. I don't use it to change anything or delete codes, just read them. Check with the dealer on the warranty question, when I brought it in they read the same codes and cleared them for me with no issues. __________________ 2010 Camaro Auto, Inferno Orange, Titanium Interior, Gearhead Wheels AIRAID CAI

03-26-2011, 07:04 PM	#7
transamguy Drives: 10 camaro LT(syn) Join Date: Jul 2010 Location: toronto Posts: 40	the check engine light is a common problem for V6's in the cold i had the issue about 6 times over the winter GM has no fix for it so far

03-28-2011, 12:18 PM	#10
TheHorse13 Drives: 2011 Black SS M6 Join Date: Oct 2010 Location: Harpers Ferry, WV Posts: 1,116	I hate to hijack the thread but could you link me to the exact OBDII item you bought on EBAY please? I'd love to have one of these handy. Thanks.

03-29-2011, 12:58 PM	#12
TheHorse13 Drives: 2011 Black SS M6 Join Date: Oct 2010 Location: Harpers Ferry, WV Posts: 1,116	Thanks for this!

03-29-2011, 05:52 PM	#13
jls Drives: 2016 1SS Join Date: Nov 2009 Location: NY Posts: 532	Back in Feb. on a cold -11 day car shook like crazy on start up, shut down and restarted it was ok except check engine light. multiple codes p1380 (miss fire detected , rough road data not aviable)po300 to po600 (missfire detected all 6 cylinders) GM addressed this concern with document #2542524- updated calibration is aviable for the engine controle module. The ecm was reprogramed nd I have not had that condition since. Hope this was helpful.