Northstar V8 Spark Plug?s - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-08-2011, 02:31 AM   #11
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with that number i would pull a couple in the front just to see what they look like, i just like knowing whats in my engine.
i might take few of mine out next weekend, and i only have 65k miles on mine
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Old 05-08-2011, 10:40 PM   #12
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I'd change. Thats pushing the given limit a bit and prolly near done. Whats your AVG MPG now?
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Old 05-09-2011, 01:38 AM   #13
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I'll pull one up front because it'* easy. I am getting 18 or 19 mpg mixed driving.
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Old 05-09-2011, 01:53 AM   #14
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yeah we have about the same MPG
but its good to check them, let me know how much fun you have doing the rear ones
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Old 05-09-2011, 12:50 PM   #15
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Yep, mileage doesn't seem to have been affected yet then. Mine is in a 17.3 average and I can squeak out 23.7 on the highway/cruisecontrol/70-75MPH.

My inboard on my boat take gymnastics to change plugs, I waited 6 years to change them this spring. I pulled the front one every spring and this year it looked like they needed some Love. LOL. Probably do the same with the GXP as it approaches 100k
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Old 10-16-2011, 12:19 PM   #16
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Quote:
Originally Posted by GXP Venom View Post
Ya with the bitch of a time to get the back 4, I'd stay with the OEM double clad plats. I believe the service interval for them is 100k. I wouldn't worry about it just yet unless the car is getting sluggish or MPG is beginning to decline. OEM is a proven long term plug. Not much to critique about that.
O common on guys its not really that bad, my OLD'* with the 3.8L was almost worse then the GXP.

Just changed the plugs with 68,000 on the clock and was glad I did! Not because they looked bad or was causing any problems. But when I started to take them out I thought the threads were going to come out with them or they would break off... they kinda grinded, scraped as they came out. It was the worst I experienced in 30 years and on 10 ten different vehicles, aluminum heads or otherwise! all that I would say is I hate to see what it would have been like at 100K mi Just take it slow and easy when your removing high mileage plugs. don't forget the anti-seize when you put them back in. Just a little will do it!

I would comment that I put in Bosch Platinum Plus 4 and they seem to be running great for the last 1K miles. Figured I'd try these because I ran them in my OLDs 3.8 for over 200K miles without any problems or decline in gas mileage.
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Old 10-18-2011, 02:56 PM   #17
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i need help with my breaks everything has been changed and still i dont have any breaks someone help please
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Old 12-27-2011, 08:27 PM   #18
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Don't forget to throw a dab of anti-sieze on the plug threads. You ARE threading in to aluminum.
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Old 01-06-2012, 10:07 PM   #19
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My GXP is gonna get her new plugs time summer hits!!!
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Old 01-08-2012, 11:20 PM   #20
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At about 80k, I was starting to get a rough idle on a cold and wet morning start. I discovered that the old plugs had a bit of crystallization building up. I installed Autolite Double Platinum APP104 plugs. So far so good!
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