any help would be appreciated!!!!
Thread Starter
Racer
Joined: Jul 2007
Posts: 250
Likes: 13
any help would be appreciated!!!!
My 05 C6 started skipping; codes that came up were P0302 & P0352.
P0302=Misfire in cyl #2
P0352= Ignition Coil No. 2
So, I replaced coil #2, spark plug, and plug wire.. Still skipping and same codes... Pulled plug and checked "no spark"
[B]Anyone got any ideas???????[/B
P0302=Misfire in cyl #2
P0352= Ignition Coil No. 2
So, I replaced coil #2, spark plug, and plug wire.. Still skipping and same codes... Pulled plug and checked "no spark"
[B]Anyone got any ideas???????[/B
Last edited by vinnie12345; Jan 27, 2010 at 09:45 PM.
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
Check the wires. Maybe you have a broken wire. Also pull the connector and check the pins. Sometimes the wires can back off the pins inside the connector in there and cause a lack of connection. I see it on aircraft all the time. your vette obviously isnt a plane but I would start there. If thats not it go to the next highest component in the system.
Thread Starter
Racer
Joined: Jul 2007
Posts: 250
Likes: 13
Check the wires. Maybe you have a broken wire. Also pull the connector and check the pins. Sometimes the wires can back off the pins inside the connector in there and cause a lack of connection. I see it on aircraft all the time. your vette obviously isnt a plane but I would start there. If thats not it go to the next highest component in the system.
Racer
Joined: Sep 2005
Posts: 279
Likes: 1
From: montrose colorado
Engine misfire
You have replace all the parts but still no spark #2. Just for grins I would swap the coil with the one next to it and see if the miss moves. The only thing else would be that the coil is not getting a signal from the ecm to fire, may-be a bad connection at the coil or the main connection to the bank of coils, bent pin or loose. May be able to check voltage to coil. A service manual would help here. I am at work or I would look up the trouble shooting for the coil. Sometimes a valve spring will break and cause a miss but you said you are not getting spark at the plug so that is not the problem.
If you fix it let us know how.
Later
If you fix it let us know how.
Later
Thread Starter
Racer
Joined: Jul 2007
Posts: 250
Likes: 13
You have replace all the parts but still no spark #2. Just for grins I would swap the coil with the one next to it and see if the miss moves. The only thing else would be that the coil is not getting a signal from the ecm to fire, may-be a bad connection at the coil or the main connection to the bank of coils, bent pin or loose. May be able to check voltage to coil. A service manual would help here. I am at work or I would look up the trouble shooting for the coil. Sometimes a valve spring will break and cause a miss but you said you are not getting spark at the plug so that is not the problem.
If you fix it let us know how.
Later
If you fix it let us know how.
Later
Racer
Joined: Sep 2005
Posts: 279
Likes: 1
From: montrose colorado
more info
I just thought of something, Some autos when the ecm thinks the engine is missing on a given cylinder it will shut down the injector to that cylinder and it may shut down the coil too. However when you clear the codes it will bring the cylinder back up.
Just for grins do a quick compression check on #2, dont pull all the plugs and disable the injectors just unplug the main harness to the coils on each side, screw in the compression gage and turn the engine over a few times. If all is well it will show good.
Just for grins do a quick compression check on #2, dont pull all the plugs and disable the injectors just unplug the main harness to the coils on each side, screw in the compression gage and turn the engine over a few times. If all is well it will show good.
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Racer
Joined: Sep 2005
Posts: 279
Likes: 1
From: montrose colorado
You are correct, that would not directly effect the spark on #2, unless the ecm is cutting off the coil for some reason after is thinks there is a problem. I know we do a lot of quessing. 
You may consider a good local tuner shop rather than the dealer.
You may consider a good local tuner shop rather than the dealer.
Thread Starter
Racer
Joined: Jul 2007
Posts: 250
Likes: 13
Thx... My tuner is booked till end of next week thats why i was thinking the dealer, I'm just impaitient.lol I'm guessing ecu or bad connection, because it was doing it the other day then stopped for a day then doing it again. If it was something serious with engine or compression it wouldn't come and go..IMHO
Racer
Joined: Sep 2005
Posts: 279
Likes: 1
From: montrose colorado
Thx... My tuner is booked till end of next week thats why i was thinking the dealer, I'm just impaitient.lol I'm guessing ecu or bad connection, because it was doing it the other day then stopped for a day then doing it again. If it was something serious with engine or compression it wouldn't come and go..IMHO
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
I would get it out of there. Alot of dealer techs don't like working on modded cars. It's a fairly simple circuit and should not be hard to find the problem. at the #2 coil 4 wire connector, check for power on the pink wire and gronud on the black wire. then put a test light across the pink and orange/white wire. Make sure the test light has more resistance than a known good coil (between terminals c&d). Start the engine, if the light is not flashing you may have an open or a fried coil driver in the ecm. PM me if you need help.
Instructor
Joined: May 2009
Posts: 211
Likes: 3
From: Dallas, TX
Check the wires. Maybe you have a broken wire. Also pull the connector and check the pins. Sometimes the wires can back off the pins inside the connector in there and cause a lack of connection. I see it on aircraft all the time. your vette obviously isnt a plane but I would start there. If thats not it go to the next highest component in the system.
Like stated above the best way to diag this would be to swap coil / plug / wire from a known good cylinder and see if the problem follows the parts or stays with the cylinder.
As you probably know P0302 is a misfire for cylinder #2 which is a general code that could mean anything (injector, coil, plug, compression, etc. etc).
P0352 is for a ignition confirmation signal from the coil. If you have this code it is most likely a coil, circuit, or ECU issue, but check the easy stuff first with a parts swap!
Best of luck with your diag!
Last edited by 1988Bullitt; Jan 28, 2010 at 10:02 PM.
Drifting
Joined: Oct 2006
Posts: 1,569
Likes: 4
From: Phoenix AZ
St. Jude Donor '09-'10-'11
Diagnosis
I'd say once you follow the above suggestions and have no luck, based on the info you've provided, I'd say it's the ECM. Has it been flashed with a handheld or dyno'd by computer? The dealer will undoubtedly groan about the mods (not sure if you're under warranty), and may set the ECM to stock specs. You tuner is probably the best bet. JMHO. Hope you get it squared-away.
Thread Starter
Racer
Joined: Jul 2007
Posts: 250
Likes: 13
Well would you believe the dealer found it. It was an open circuit after the ecm. My dealer is cool, and the service writer is a friend. They're cool with all my mods. He first thought it was the ecm, and was going to warranty it but then found the issue. It took a bit to find it with all the extra wiring from the supercharger and gauges. I was expecting a lot of labor hrs after two days of looking, but he only charged me $200.. Thanks for all the help guys!!!! There are a lot of knowledgeable guys on here...
