Misfire issue - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

oramaCamaro · 06-04-2023, 10:38 PM

I have a 2010 ss with just under 50k on it and I have misfire on cylinder 7 code. I was cruising about 40 mph and all of a sudden it started to misfire, I turned around and drove home about 3 miles. I swapped the coil, spark plug and wire to another cylinder, cleared the code and started it up and still get the cylinder 7 misfire code.

I pulled the plug and it was wet and smelled like gas so I don’t think it’s a injector problem. I’m assuming it doesn’t have spark and I’m not sure what to do next. Any help would be greatly appreciated.

gtstorey · 06-05-2023, 08:42 AM

Could still be an injector problem of over fueling. Might be a wiring issue feeding the coil.

Beyond that are more serious issues with valve train followed by cylinder issues.

ElderJ · 06-05-2023, 09:00 AM

Just for clarity, did you hear/feel the misfire, or was it just a flashing MIL? Reason I ask is because a few years ago I was rolling down the highway when my check engine light started flashing. I coasted down to around 50 before pulling over at the next exit, but I didn't feel a single thing wrong with the engine. The light stopped flashing and disappeared, and I returned home like normal w/o any incident. I ended up changing the coil and all the plugs just for kicks. No issues since, and I believe one of the veteran posters on here claimed that it was more than likely just an oil fouled plug, apparently a common issue on my ride (particular the 1 plug).

FasNuf · 06-05-2023, 09:48 AM

Check for spark at the wire end that connects to the plug. You said you swapped all the parts so they're probably good but like gstorey said, it sounds like the harness triggering the coil might be loose of faulty.

oramaCamaro · 06-05-2023, 12:14 PM

Quote:

Originally Posted by ElderJ

Just for clarity, did you hear/feel the misfire, or was it just a flashing MIL? Reason I ask is because a few years ago I was rolling down the highway when my check engine light started flashing. I coasted down to around 50 before pulling over at the next exit, but I didn't feel a single thing wrong with the engine. The light stopped flashing and disappeared, and I returned home like normal w/o any incident. I ended up changing the coil and all the plugs just for kicks. No issues since, and I believe one of the veteran posters on here claimed that it was more than likely just an oil fouled plug, apparently a common issue on my ride (particular the 1 plug).

I didn’t really feel it but I can definitely hear it

oramaCamaro · 06-05-2023, 12:19 PM

Quote:

Originally Posted by FasNuf

Check for spark at the wire end that connects to the plug. You said you swapped all the parts so they're probably good but like gstorey said, it sounds like the harness triggering the coil might be loose of faulty.

I checked the wiring and didn’t see anything wrong with it, I didn’t pull back the wire loom or unwrap the electrical tape though. I thought maybe something at the connector but I didn’t see anything out of the ordinary

acutron42 · 06-05-2023, 08:28 PM

Here is a diagram for 1357. If you need any others let me know.

oramaCamaro · 06-06-2023, 12:41 PM

Quote:

Originally Posted by acutron42

Here is a diagram for 1357. If you need any others let me know.

Thanks, this could come in handy

oramaCamaro · 06-08-2023, 06:00 AM

If it was a injector problem would it throw a injector code?

Rock-It Man · 06-08-2023, 06:45 AM

Take a close look at the injector wiring.

oramaCamaro · 06-08-2023, 09:40 AM

Quote:

Originally Posted by Rock-It Man

Take a close look at the injector wiring.

I did and looks good, I was going to swap the injector to another cylinder and see if the code changes to another cylinder but I thought a bad injector would throw an injector code.

xstuntman · 06-08-2023, 05:33 PM

I check for spark by running a piece of wire up into the plug boot and making contact with metal end. Then get the bare wire fairly close to the plug and have somebody crank it over to see if the spark jumps.

I'll add that I always use a pair of insulated needle nose to hold the wire. That's a mistake I made once on a friend's old Ford LTD. Cleared up my sinuses for a couple days tho.

oramaCamaro · 09-19-2023, 04:05 PM

I finally got some time to work on the car again and used an inline spark tester and it’s getting spark. I swapped the injector to another cylinder and I’m still getting the cylinder 7 code. I’m not sure what to do next, maybe a compression test? I would bring it to a mechanic but it sits so low I’m worried about it getting damaged getting on the flatbed.

06-04-2023, 10:38 PM	#1
oramaCamaro Drives: 2010 SS RS Join Date: Aug 2009 Location: upstate ny Posts: 88	Misfire issue I have a 2010 ss with just under 50k on it and I have misfire on cylinder 7 code. I was cruising about 40 mph and all of a sudden it started to misfire, I turned around and drove home about 3 miles. I swapped the coil, spark plug and wire to another cylinder, cleared the code and started it up and still get the cylinder 7 misfire code. I pulled the plug and it was wet and smelled like gas so I don’t think it’s a injector problem. I’m assuming it doesn’t have spark and I’m not sure what to do next. Any help would be greatly appreciated.

06-05-2023, 08:28 PM	#7
acutron42 Drives: 2013 Camaro 2SS AGM Join Date: Apr 2020 Location: WNY Posts: 738	Here is a diagram for 1357. If you need any others let me know. Attached Images __________________ 2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails.

06-08-2023, 05:33 PM	#12
xstuntman Drives: 2012 Victory Red LFX Join Date: Dec 2012 Location: west central Texas Posts: 1,310	I check for spark by running a piece of wire up into the plug boot and making contact with metal end. Then get the bare wire fairly close to the plug and have somebody crank it over to see if the spark jumps. I'll add that I always use a pair of insulated needle nose to hold the wire. That's a mistake I made once on a friend's old Ford LTD. Cleared up my sinuses for a couple days tho. __________________ 2018 SS wheels, red Heritage grille, actual driving lights, ZL1 strut tower brace, GM Performance billet aluminum fuel door, front grille Bowtie delete, painted red rotors and calipers, 1/4 window American Flags, splash guards, AEM dry panel air filter.

06-05-2023, 08:42 AM	#2
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,178	Could still be an injector problem of over fueling. Might be a wiring issue feeding the coil. Beyond that are more serious issues with valve train followed by cylinder issues.

06-05-2023, 09:00 AM	#3
ElderJ Drives: 2014 Camaro 1LT Join Date: Aug 2019 Location: Central Florida Posts: 372	Just for clarity, did you hear/feel the misfire, or was it just a flashing MIL? Reason I ask is because a few years ago I was rolling down the highway when my check engine light started flashing. I coasted down to around 50 before pulling over at the next exit, but I didn't feel a single thing wrong with the engine. The light stopped flashing and disappeared, and I returned home like normal w/o any incident. I ended up changing the coil and all the plugs just for kicks. No issues since, and I believe one of the veteran posters on here claimed that it was more than likely just an oil fouled plug, apparently a common issue on my ride (particular the 1 plug).

06-05-2023, 09:48 AM	#4
FasNuf Drives: 2014 Camaro ZL1 Join Date: Jul 2019 Location: Oregon Posts: 1,635 View My Garage	Check for spark at the wire end that connects to the plug. You said you swapped all the parts so they're probably good but like gstorey said, it sounds like the harness triggering the coil might be loose of faulty.

06-08-2023, 06:00 AM	#9
oramaCamaro Drives: 2010 SS RS Join Date: Aug 2009 Location: upstate ny Posts: 88	If it was a injector problem would it throw a injector code?

06-08-2023, 06:45 AM	#10
Rock-It Man 376 cubic inches of fun Drives: 2023 Camaro ZL1 A10 Join Date: Jul 2010 Location: MA Posts: 4,033 View My Garage	Take a close look at the injector wiring.

09-19-2023, 04:05 PM	#13
oramaCamaro Drives: 2010 SS RS Join Date: Aug 2009 Location: upstate ny Posts: 88	I finally got some time to work on the car again and used an inline spark tester and it’s getting spark. I swapped the injector to another cylinder and I’m still getting the cylinder 7 code. I’m not sure what to do next, maybe a compression test? I would bring it to a mechanic but it sits so low I’m worried about it getting damaged getting on the flatbed.