2009 nice improvement
Thread Starter
Racer
Joined: Sep 2011
Posts: 352
Likes: 6
From: Centreville Maryland
2009 nice improvement
55K miles. Very slight roughness. Almost imperceptible, but there. Today replace the plugs and wires. I can tell the difference. Much smoother, $200 well spent. FYI
Thread Starter
Racer
Joined: Sep 2011
Posts: 352
Likes: 6
From: Centreville Maryland
The plugs were very servicable, clean burn but there was some erosion at the tip. Wires looked good too. Never the less there was a noticable difference in idle and running smoothness.
Pro
Joined: Feb 2005
Posts: 627
Likes: 5
From: Frisco TX
Team Owner
Joined: Sep 2000
Posts: 25,007
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
The tech at our dealership says that when he replaces plugs and wires at 50k miles (he did mine on our 2001 and now 2009), they don't look like they need it. But when he replaces them at 100k miles, they definitely DO need it.
Trying to be objective, it did feel like our cars ran slightly smoother on the new plugs & wires but the difference was small. The bigger advantage is that now I don't have to mess with them till 100k or more.
Trying to be objective, it did feel like our cars ran slightly smoother on the new plugs & wires but the difference was small. The bigger advantage is that now I don't have to mess with them till 100k or more.
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Le Mans Master
Joined: Dec 2004
Posts: 5,492
Likes: 807
From: West coast CA
I changed mine around the same mileage and idle and part-throttle smoothness was noticeably improved. It's not your imagination.
Melting Slicks
Joined: Jul 2011
Posts: 2,083
Likes: 68
From: Carrollton GA
W. GA Events Coordinator
St. Jude Donor '12-'13-'14-'15
Beside miles, There are other factors that can be considered when to decide to change plugs and wires.
The age of the wires, the number of times and how carefully they have been removed. If wires are man handled, you can break them. If the car is over 5 years old I would recommend changing the wires. Heat and age are not your friend when it comes to rubber or plastic.
Also, if the plugs have been out and put back in, if care was not used you could have a cracked insulator, which will cause your engine to run rough.
In the end, if you have an older C6 or purchased used, it might be worth changing them, so you have a level set of where you are on this critical art of your cars ignition system.
The age of the wires, the number of times and how carefully they have been removed. If wires are man handled, you can break them. If the car is over 5 years old I would recommend changing the wires. Heat and age are not your friend when it comes to rubber or plastic.
Also, if the plugs have been out and put back in, if care was not used you could have a cracked insulator, which will cause your engine to run rough.
In the end, if you have an older C6 or purchased used, it might be worth changing them, so you have a level set of where you are on this critical art of your cars ignition system.
Last edited by JKbride; Nov 17, 2013 at 08:18 AM.
Team Owner
Joined: Mar 2005
Posts: 20,933
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From: salem OR
Race Director
Joined: Sep 2007
Posts: 16,557
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
My 6 year old 113K mile car has the original wires and 40K on the plugs. If I decide to change them, it'll be during a test 'n tune day at the dragstrip. I'll want to know if there's a real improvement or just imagined. Timeslips don't lie.
Melting Slicks
Joined: Jul 2011
Posts: 2,083
Likes: 68
From: Carrollton GA
W. GA Events Coordinator
St. Jude Donor '12-'13-'14-'15
If you want to really know I recommend a dyno before and after the change.
Burning Brakes
Joined: Sep 2001
Posts: 937
Likes: 70
From: Ponte Vedra Florida
