Cold start misfires. I think this is more serious than I thought! - Page 9 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JCO2185 · 03-14-2012, 01:29 PM

im telling ya man, do that injector. I replaced mine and so far so good, going on 3 days now with the light not coming back on

TJ91 · 03-14-2012, 01:55 PM

Wow man this thread scares me. Jay wouldnt you have to go to stock to do any of these TSBs? That is going to be a PITA!

Blacktip · 03-14-2012, 01:58 PM

Sweet

bmorecam · 03-14-2012, 02:26 PM

Quote:

Originally Posted by JCO2185

im telling ya man, do that injector. I replaced mine and so far so good, going on 3 days now with the light not coming back on

I'm trying to look for more signs that it's possibly the injectors. I just don't want to go through the hassle of dealing with these injectors and come to find out that it was only choke mode related. I never had any stall or misfire while driving or anytime after the initial choke mode. We just got rid of the choke mode since I didn't even need it in the first place since I have no cats, so if I still get misfires than I will definitely know it's probably those injectors. I guess I will just go down the line. I already did the coil and plug check and actually replaced the plugs, did the cr check. I would also like to try as GM recommend and clean the top of the engine. I'm going to seafoam the car tomorrow.

So far it's been good tho. No misfire when I first start the car and everything seem normal. So we will just have to see

TJ91 · 03-14-2012, 02:48 PM

Quote:

Originally Posted by bmorecam

I'm trying to look for more signs that it's possibly the injectors. I just don't want to go through the hassle of dealing with these injectors and come to find out that it was only choke mode related. I never had any stall or misfire while driving or anytime after the initial choke mode. We just got rid of the choke mode since I didn't even need it in the first place since I have no cats, so if I still get misfires than I will definitely know it's probably those injectors. I guess I will just go down the line. I already did the coil and plug check and actually replaced the plugs, did the cr check. I would also like to try as GM recommend and clean the top of the engine. I'm going to seafoam the car tomorrow.

So far it's been good tho. No misfire when I first start the car and everything seem normal. So we will just have to see

sounds like the best way to go, no need to start replacing things yet, if the the problem persists, then its time to throw an LSX in there ...I mean time for new injectors lol

Mach · 03-14-2012, 03:06 PM

The good news is nobody will be getting cold start misfires until Dec-Jan.

Beauwulf · 03-14-2012, 07:10 PM

On the Sea Foam, you can induce the fluid (best to be atomized) into the intake tract at most any convenient location. Yea, you can do it at the brake booster.... if you have one. I prefer to use a spray bottle with the sea foam right into the TB. The trick is to get the car running then pull the CAI and keep it revved up so it doesn't stall, spray a little in at the throttle body and pop the cai back on. Spray a bit and let it smoke up. Uh... don't do it indoors... it's pretty smokey! Depending on the engine, it can take several applications to get things all cleaned up.

I'd start with 3 rounds (several good squirts from the spray bottle for each "round") the first time, let it run till it will idle and drive it a few miles gently.

Rinse and repeat... When you get her all cleared out, change the oil out and clean the plugs. You can kinda "preclean" by running a bit in the gas tank (per product direction) before you do the direct application. Sometimes, that enough to do the trick....

Something else I was thinking might effect this is the valve clearances... Have you looked at those at all?

ChadG · 03-14-2012, 07:41 PM

That's some interesting information on that TSB - my neighbor across the street did an upper induction service on my car for free (he's a tech at Lindsay Cadillac) I just brought my vehicle in one day and hung out with him in the shop (which I'm sure is against every rule Cadillac has) while he did the work.

I would recommend using that over Seafoam, the chemicals that the dealership uses (BG) as well as the equipment (they use a pressurized release mechanism that sprays into your TB at a constant rate over ~30 minutes) they use are better. If you don't do the Seafoam correctly you run the risk of locking your motor and throwing a rod.

The service is expensive, but it's a good thing to do if you ever drove your vehicle for any period of time without a catch can. Just have a good dealership do it for you (you can take it to my man Mike Kalman at Koon's Chevrolet in Tyson's Corner, he'll take good care of you tell him Chad G sent you).

TooCool5 · 03-15-2012, 10:03 AM

Wow this explains why the cold start misfire went away when I sprayed mystery oil in the intake.
I always suspected the intakes were sticking and this confirms it.
GM has to have a better solution than just cleaning them as the problem just comes back!
Maybe they just want to get us to the point where our warranty goes away?
I still say they are frustrating us LLT camaro owners...

Their SB is a band aid approach!

Blade · 03-15-2012, 10:07 AM

I haven't had misfire issues yet that Jay has encountered. But I wonder what will happen later this year.

TooCool5 · 03-15-2012, 10:09 AM

Quote:

Originally Posted by Blade

I haven't had misfire issues yet that Jay has encountered. But I wonder what will happen later this year.

Why couldn't the GM cust serv rep on this forum help us with this service bulletin, when I asked I got nothing!

Summer is coming and my warranty will be over.

bmorecam · 03-15-2012, 10:51 AM

I'm going to cean the top today with seafoam and run some through the gas tank too. I will let you guys know how dirty she was only after 20k miles.

Mach · 03-15-2012, 11:32 AM

Bemore... Keep us posted.

Some good info here.. http://www.seafoamsales.com/how-to-u...treatment.html

JCO2185 · 03-15-2012, 04:42 PM

well this morning was a little colder than its been over the past week. Start my car before I leave for work, go back inside to grab something to drink. Come back out and the check engine light is back on!!! ARGHHHHHHH

Going to see what code it is this time

03-14-2012, 01:29 PM	#113
JCO2185 RIDING ON AIR Drives: 2010 2LT/RS Summit White Join Date: Dec 2009 Location: Long Island NY Posts: 964	im telling ya man, do that injector. I replaced mine and so far so good, going on 3 days now with the light not coming back on __________________ --John--2010 Camaro 2LT/RS, Summit White Air Ride Suspension, BBK Longtube Headers, Hi-Flo cats, Doug Thorley catback exhaust, Elite Catch-Can, Airraid CAI, Trifecta tune, ZL1 front end with Phantom grille, ZL1 side skirts, MRR228 graphite wheels

03-14-2012, 01:55 PM	#114
TJ91 :chevy: Drives: 2LT/RS Join Date: Jun 2008 Location: Toronto Posts: 13,033	Wow man this thread scares me. Jay wouldnt you have to go to stock to do any of these TSBs? That is going to be a PITA! __________________ CAMARO Consult your doctor before taking Camaro Side effects include Sudden increase in Heart Rate, Insomnia and occasional hallucinations If you experience Permagrin exceeding 4 hours after taking Camaro, seek immediate Camaro5 Help CAMARO Bringing excitment back into the Garage

03-14-2012, 01:58 PM	#115
Blacktip Drives: 2011 1LT Silver RS package Join Date: Mar 2011 Location: West Palm Beach Posts: 461	Sweet __________________ .....Well alright,alright..didn't know it was this kind of party

03-14-2012, 03:06 PM	#118
Mach Drives: White M6 1LT RS Join Date: Mar 2010 Location: Canton, MI Posts: 1,676	The good news is nobody will be getting cold start misfires until Dec-Jan. __________________ Pfadt Sway Bars - FE3 Suspension - Barton Shifter - IdealG's Clutch Master Cylinder - Trifecta - Vmax TB - Vararam Intake - MACE 25mm Insulator - Plenum Insulator - Ported/Gasket Matched Intake Manifold - Rx Catchcan - AAC DRL's - 4 Pack Aux Gauges - Steering Controls - AAC Afterburners - DIY Led Sidemarkers - ZL1 Front End Next mod: Done!

03-14-2012, 07:10 PM	#119
Beauwulf Drives: '10 LT RS A6 & '04 Acura RSX Type S Join Date: Oct 2009 Location: Florida Posts: 1,529	On the Sea Foam, you can induce the fluid (best to be atomized) into the intake tract at most any convenient location. Yea, you can do it at the brake booster.... if you have one. I prefer to use a spray bottle with the sea foam right into the TB. The trick is to get the car running then pull the CAI and keep it revved up so it doesn't stall, spray a little in at the throttle body and pop the cai back on. Spray a bit and let it smoke up. Uh... don't do it indoors... it's pretty smokey! Depending on the engine, it can take several applications to get things all cleaned up. I'd start with 3 rounds (several good squirts from the spray bottle for each "round") the first time, let it run till it will idle and drive it a few miles gently. Rinse and repeat... When you get her all cleared out, change the oil out and clean the plugs. You can kinda "preclean" by running a bit in the gas tank (per product direction) before you do the direct application. Sometimes, that enough to do the trick.... Something else I was thinking might effect this is the valve clearances... Have you looked at those at all? __________________

03-14-2012, 07:41 PM	#120
ChadG Drives: 2010 Black Camaro LS Join Date: Feb 2010 Location: Bay Area, CA Posts: 1,679 View My Garage	That's some interesting information on that TSB - my neighbor across the street did an upper induction service on my car for free (he's a tech at Lindsay Cadillac) I just brought my vehicle in one day and hung out with him in the shop (which I'm sure is against every rule Cadillac has) while he did the work. I would recommend using that over Seafoam, the chemicals that the dealership uses (BG) as well as the equipment (they use a pressurized release mechanism that sprays into your TB at a constant rate over ~30 minutes) they use are better. If you don't do the Seafoam correctly you run the risk of locking your motor and throwing a rod. The service is expensive, but it's a good thing to do if you ever drove your vehicle for any period of time without a catch can. Just have a good dealership do it for you (you can take it to my man Mike Kalman at Koon's Chevrolet in Tyson's Corner, he'll take good care of you tell him Chad G sent you).

03-15-2012, 10:03 AM	#121
TooCool5 Drives: 2010 Camaro 1LS 3.6 LLT V6 325 HP Join Date: May 2009 Location: LS Posts: 4,242 View My Garage	Wow this explains why the cold start misfire went away when I sprayed mystery oil in the intake. I always suspected the intakes were sticking and this confirms it. GM has to have a better solution than just cleaning them as the problem just comes back! Maybe they just want to get us to the point where our warranty goes away? I still say they are frustrating us LLT camaro owners... Their SB is a band aid approach! __________________ 2010 Camaro Auto, Inferno Orange, Titanium Interior, Gearhead Wheels AIRAID CAI

03-15-2012, 10:07 AM	#122
Blade Drives: 2016 Camaro 2SS BVM Join Date: Dec 2009 Location: Charlotte Posts: 4,689 View My Garage	I haven't had misfire issues yet that Jay has encountered. But I wonder what will happen later this year. __________________ Formerly owner of: 2012 2SS/RS Build Thread - Totaled by red light runner 2010 LT/RS Build Thread - Traded in for 2012 2SS 2007 Acura TSX 1992 Oldsmobile Achieva V6 1992 Mercury Sable

03-15-2012, 10:51 AM	#124
bmorecam Account Suspended Drives: jealous vendors mad!! HAHA!! Join Date: Jan 2011 Location: CYBERGMONSTER@GMAIL.COM Posts: 3,658 View My Garage	I'm going to cean the top today with seafoam and run some through the gas tank too. I will let you guys know how dirty she was only after 20k miles.

03-15-2012, 11:32 AM	#125
Mach Drives: White M6 1LT RS Join Date: Mar 2010 Location: Canton, MI Posts: 1,676	Bemore... Keep us posted. Some good info here.. http://www.seafoamsales.com/how-to-u...treatment.html __________________ Pfadt Sway Bars - FE3 Suspension - Barton Shifter - IdealG's Clutch Master Cylinder - Trifecta - Vmax TB - Vararam Intake - MACE 25mm Insulator - Plenum Insulator - Ported/Gasket Matched Intake Manifold - Rx Catchcan - AAC DRL's - 4 Pack Aux Gauges - Steering Controls - AAC Afterburners - DIY Led Sidemarkers - ZL1 Front End Next mod: Done!

03-15-2012, 04:42 PM	#126
JCO2185 RIDING ON AIR Drives: 2010 2LT/RS Summit White Join Date: Dec 2009 Location: Long Island NY Posts: 964	well this morning was a little colder than its been over the past week. Start my car before I leave for work, go back inside to grab something to drink. Come back out and the check engine light is back on!!! ARGHHHHHHH Going to see what code it is this time __________________ --John--2010 Camaro 2LT/RS, Summit White Air Ride Suspension, BBK Longtube Headers, Hi-Flo cats, Doug Thorley catback exhaust, Elite Catch-Can, Airraid CAI, Trifecta tune, ZL1 front end with Phantom grille, ZL1 side skirts, MRR228 graphite wheels

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