C6 computer problem ?
Thread Starter
4th Gear
Joined: Jul 2011
Posts: 4
Likes: 0
C6 computer problem ?
4 cylinders are not firing good compression pulled valve covers everything looked good checked fuel inj. good, checked spark good, checked back pressure good, swaped coil packs spark plugs and wires good , computer code is missfire on 5,7 anybody have any suggestions ?
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Burning Brakes
Joined: Feb 2008
Posts: 1,143
Likes: 14
From: Mechanicsville Maryland
I just had my computer replaced in my 2008 with 7k miles...it cost me more than 1k at ECS to correct. Hope that's not your problem. Even though I had the car tuned 500 miles ago they told me they had to put it back on the Dyno to retune the new computer.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I know on the C-5's, there are two ground wires on the rear of the driver's side head that ground the two sets of coil packs. I do not know if its the same on the C-6 and I'm far away from home so I can't go look at my '07 for you. Also, C-5 again, there are fuses for the injectors and I think it was one fuse for each side.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Is it 1 bank that is missfiring. I just had a problem like this and it turned out to be the wiring harness on the coil packs. Try switching those and see if it changes anything. I changed both of mine and the newer ones come with a plastic protector that helps to keep th wires from getting crushed by the coil pack. Good luck.
Intermediate
Joined: Feb 2010
Posts: 25
Likes: 0
I'm having a similar problem with my 09. Stock, misfiring on all cylinders but it starts usually with #7 they still are looking for the issue. Its not injectors plugs or pressure. they say its not the computer as they swapped out with a new one and issue remains.
