P0303 Code - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

idealneil · 01-16-2013, 07:08 PM

My car has been at the dealership for 2 days
Code P0303 is cylinder 3 misfire. They have ruled out everything from computer, injectors coils plugs wires all electrical.
Service Stabiltrak would light up and check engine light flash and turn off after 20 seconds or so with a hard acceleration. But I have no loss of power.
I can reproduce this same code with a hard acceleration everytime.
They have an internalist specialist looking at it tommorow.
This is a 2ss/rs A6 23K miles
Anybody else have any answers or had similiar issues resolved on the V8?
Most of the searches I have done nobody really lets anyone know what the final problem was but I can see where others have had a similiar issue.
I did see a Service Bulletin on the head gasket but looks like it is #8 cylinder
Thanks for any information I can get.

newcamaroguy7 · 11-15-2014, 02:48 PM

Im getting the same code after new spark plugs

Gee · 11-15-2014, 03:10 PM

Loss of spark could be so many things. These engines are known for carbon build up which can cause spark knock. How many miles on her, and do you use a catch can/use seafoam?

GSoccerCam · 10-31-2015, 03:05 PM

Quote:

Originally Posted by idealneil

My car has been at the dealership for 2 days
Code P0303 is cylinder 3 misfire. They have ruled out everything from computer, injectors coils plugs wires all electrical.
Service Stabiltrak would light up and check engine light flash and turn off after 20 seconds or so with a hard acceleration. But I have no loss of power.
I can reproduce this same code with a hard acceleration everytime.
They have an internalist specialist looking at it tommorow.
This is a 2ss/rs A6 23K miles
Anybody else have any answers or had similiar issues resolved on the V8?
Most of the searches I have done nobody really lets anyone know what the final problem was but I can see where others have had a similiar issue.
I did see a Service Bulletin on the head gasket but looks like it is #8 cylinder
Thanks for any information I can get.

what did you get for a solution.. same problem even after new spark new coilpack new rail system new injectors and even changed around the spark wires. still cylinder 3 is not working and doesnt go over 140 temp while the others land around 300

MarylandSpeed · 10-31-2015, 10:37 PM

If you did not remove the plugs when doing the header install, one could be cracked. Same if you removed them, you could have dropped one. Whenever I see this after a header install it is the first thing I think of.

derklug1 · 10-31-2015, 10:43 PM

It's elementary, and the dealership should know this, but have they done a cam/crank relearn?

Jalberdi99 · 12-30-2021, 01:58 PM

Any solution to this problem? Any updates? Having same problem with mine

Jalberdi99 · 12-30-2021, 03:54 PM

I got code p0303. Switch sparkplug , coil and cable from cylinder 3 to cylinder 1 to see if the code would transfer to cylinder 1, but it did not. What else could it be? I did the screwdriver test to see if the fuel injector was firing (ticking sound) like the rest and it does. What else could it be? Any help would be apriciated. Battery voltage when cars off it's about 12.5 (around there) , when running it's around 14.something. HELP!!!!!!

01-16-2013, 07:08 PM	#1
idealneil Drives: 2011 SS/RS And 2011 LT Join Date: Sep 2011 Location: Central Texas Posts: 61	P0303 Code My car has been at the dealership for 2 days Code P0303 is cylinder 3 misfire. They have ruled out everything from computer, injectors coils plugs wires all electrical. Service Stabiltrak would light up and check engine light flash and turn off after 20 seconds or so with a hard acceleration. But I have no loss of power. I can reproduce this same code with a hard acceleration everytime. They have an internalist specialist looking at it tommorow. This is a 2ss/rs A6 23K miles Anybody else have any answers or had similiar issues resolved on the V8? Most of the searches I have done nobody really lets anyone know what the final problem was but I can see where others have had a similiar issue. I did see a Service Bulletin on the head gasket but looks like it is #8 cylinder Thanks for any information I can get.

11-15-2014, 02:48 PM	#2
newcamaroguy7 Drives: red camaro ss 2010 Join Date: Dec 2013 Location: la feria tx Posts: 321	Im getting the same code after new spark plugs __________________ mods: ported tb,1 7/8 TSP lth, adm Cai and scoop, 3:73 gears,exhaust and RPT Tune. best time before headers: 12.6@111

10-31-2015, 10:43 PM	#6
derklug1 Drives: 2016 GT350 Join Date: May 2015 Location: grand rapids mi Posts: 145	It's elementary, and the dealership should know this, but have they done a cam/crank relearn? __________________ "Life is hard, it's harder if you're stupid" John Wayne

12-30-2021, 01:58 PM	#7
Jalberdi99 Drives: 2014 Summit White 2SS/RS M6 Join Date: Aug 2012 Location: @ ur moms house in VA Posts: 1,405	Any solution to this problem? Any updates? Having same problem with mine __________________

11-15-2014, 03:10 PM	#3
Gee Silver Ice Drives: 2011 1LT Coupe SIM Join Date: Nov 2013 Location: MA Posts: 1,420 View My Garage	Loss of spark could be so many things. These engines are known for carbon build up which can cause spark knock. How many miles on her, and do you use a catch can/use seafoam?

10-31-2015, 10:37 PM	#5
MarylandSpeed Account Suspended Drives: 2012 ZL1 & 2010 2SS/RS Join Date: Jul 2009 Location: Maryland Posts: 3,378	If you did not remove the plugs when doing the header install, one could be cracked. Same if you removed them, you could have dropped one. Whenever I see this after a header install it is the first thing I think of.

12-30-2021, 03:54 PM	#8
Jalberdi99 Drives: 2014 Summit White 2SS/RS M6 Join Date: Aug 2012 Location: @ ur moms house in VA Posts: 1,405	I got code p0303. Switch sparkplug , coil and cable from cylinder 3 to cylinder 1 to see if the code would transfer to cylinder 1, but it did not. What else could it be? I did the screwdriver test to see if the fuel injector was firing (ticking sound) like the rest and it does. What else could it be? Any help would be apriciated. Battery voltage when cars off it's about 12.5 (around there) , when running it's around 14.something. HELP!!!!!! __________________