: Time for new spark plugs



BlackedouT STS
01-06-12, 04:13 PM
It's time for me to change my plugs. My car is a 2005 with the N*. How do I find out if my car has AC Delco plugs or Denso plugs without pulling one out? One dealer told me they are AC Delco and another told me they are Denso.

dkozloski
01-06-12, 04:45 PM
Some AC plugs are being made by Denso.

FWIW, Albert Champion was a French bicycle racer in the early 1900s that made spark plugs for a sideline. His investors dropped him and kept his name, Champion for the company. Albert joined forces with GM and became AC sparkplug.

malatu
01-06-12, 04:49 PM
Koz knows that cause he played poker with Al's older brother!

scott9001
01-06-12, 07:09 PM
i wouldent put anything but AC delco in mine and i would hope you would think the same!

dkozloski
01-06-12, 07:34 PM
North*s are notorious for choking on sparkplugs other than OEM.

chazglenn3
01-07-12, 10:12 AM
No doubt...especially the FWD versions.

mckellyb
01-07-12, 02:20 PM
Our old '95 3.5L Dodge Intrepid was very picky about plugs, too, so beware....

"But it's platinum-tipped, it's better!"

Maybe...but that doesn't mean the engine runs properly, afterward.

bbshriver
01-09-12, 12:06 PM
I used Bosch Iridium in my 2005 N*... runs great.

BlackedouT STS
01-10-12, 07:35 PM
Thanks for the input. I'm going to install the new AC Delco plugs this weekend.

dkozloski
01-10-12, 09:32 PM
I used Bosch Iridium in my 2005 N*... runs great.

History has shown that Bosch fine wire plugs in particular, don't last long in a North*. Good luck.

shortfur7
03-01-12, 10:02 PM
What come standard in the 2005 N*? Is it the AC copper, platinum, or iridium? Because the dealer is giving my an option of all 3.
I need to do mine to because there is 120K miles on it and i dont think they have ever been changed.

EChas3
03-01-12, 10:51 PM
I think they are platinum. Acording to my 2006 manual:

V6 (not DI) - GM 12597464 or AC 41-990
V8 (4.4 SC) - GM 12592619 or AC 41-991
V8 (4.6 NA) - GM 12571533 or AC 41-986

shortfur7
03-01-12, 11:05 PM
I think they are platinum. Acording to my 2006 manual:

V6 (not DI) - GM 12597464 or AC 41-990
V8 (4.4 SC) - GM 12592619 or AC 41-991
V8 (4.6 NA) - GM 12571533 or AC 41-986

Thanks for the help.

jmildoc
03-06-12, 08:24 AM
Any harm in changing just 4 plugs??

malatu
03-06-12, 08:59 AM
That would be comparative to buying only three new tires and leaving one old one on the car. Sure you could do it but will when will you replace the remaining plugs at a later date? For practicality purposes, it makes a great deal of sense to change all of them at once. Personally, I wouldn't consider replacing only four plugs.

jmildoc
03-06-12, 05:44 PM
I would change the other four in a month or so yeah. Maintenance record shows they were replaced about 30k ago, but I didn't do it so I just want to know for sure.

EChas3
03-06-12, 08:21 PM
I plan on replacing mine at 100,000 miles (unless I have an issue).