Wrenching on your GXP??? - 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 09-07-2009, 12:20 PM   #11
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Iook in the middle of the valve covers. You should see the plug wires. but first remove all the engine covers. Don't remove the plugs on the engine if it'* warm, it has alu. heads. You can mess up the plug threads.
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Old 09-08-2009, 01:56 AM   #12
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There are no plug wires in a GXP LD8. You will see the individual coil packs that sit on top of the plugs, One per plug. There is only one engine cover.
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Old 09-12-2009, 04:24 PM   #13
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thanks John
ill take a look at it today whenever i get a chance.,..

how hard is it to change them? specially the back ones

and any idea what plugs i should be using? or just reg AC delco ones?
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Old 09-18-2009, 09:19 PM   #14
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Quote:
Originally Posted by SAMzGXP View Post
thanks John
ill take a look at it today whenever i get a chance.,..

how hard is it to change them? specially the back ones

and any idea what plugs i should be using? or just reg AC delco ones?
I believe they were iridium plugs. I would go with the ACDELCO Iridium'* or another Iridium plug from another company.
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Old 09-18-2009, 10:13 PM   #15
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Sorry, been in and out here and dealing with a close friend driving a Ninja under a pickup. OEM plugs are Delco Double platinum clad. Supposedly good for 90+ miles. I use Autolite Copper because I get a nitrous hair up my butt often. It eats plat and irridium fast. I would stick with OEM from GM Parts. You'd be hard pressed to find another plug thats proven to go 100k time after time as shown in Caddys for a long while now.

I let the local Caddy Dealer do my plugs and aint afraid to admit it. I dont want to deal with it. Several owners have done it and say it'* moderately to very hard. You need to remove the EGR and strut tower brace, have the patience of a saint, and 7 long effeminate fingers . I was talking to a Caddy owner up to the local garage a few weeks back, and he said it'* alot easier to do from the back with the car up on a lift. Not sure on that one. I'm to fat to fly, or get further under the front than to pull the oil drain plug in my gravel driveway.
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