: 2005 CTS-V Spark plug and MSD wires



Scott2012
08-11-13, 09:08 PM
NGK iridium + MSD 8.5mm

Read up on all the folks on the forum changing plugs and wires- i have 90,000 miles now and the plugs and wires are original.
Got em done today in just about 2 hours. Here are some tips:

1) There is no need to pull the battery, in fact I'm not quite sure how it could make things easier.
2) I can see why some might pull the dip stick- but really may only to get the new plug in... I was able to sneak it in w/o pulling the dipstick.
3) I pulled the coil packs on each side- in addition to space, it's so much easier to plug back in boot first, then remount and plug in the coil.
4). The "dreaded" plug on the back of motor on passenger side was actually pretty easy. If you pull the battery ground cable (15mm) it's a piece of cake.
5) getting the plugs off- it took less than 30 seconds per plug. I used a long needle nose pliers (see photo below) gripped the edge of the metal heat shield, and popped each off. (I did destroy two wires- but that was expected).
6) MSD wires- I could have used the stock heat shields, but didn't want them rattling around, so I didn't use them.
7) MSD wires click once on the spark plug and click twice on the coil- this can take some twisting and elbow grease.

Here's a picture of the parts and all tools used:
135457

Scott2012
08-11-13, 09:08 PM
In case you want to know-
torque setting on strut bar is 81#
Gap for NGK is 0.40.

BigDaddy-V
08-11-13, 10:41 PM
You will have to post up what you think of that combo! I am about to do mine and was thinking that same combo or the ac delco platinum a and wires!

BDV

Scott2012
08-11-13, 10:46 PM
I sure will... I fired her up, runs great ... But haven't taken for a spin yet.
I think it will help even more when I take her in for a tune :)

carlson_mn
08-12-13, 12:26 AM
nice job man. people pay a lot of money to shops to do relatively simple tasks like this.

lollygagger8
08-12-13, 11:27 AM
Good job! Agreed.....battery and dip stick removal are totally not necessary.

Iridium plugs should not be gapped with the small metal disc gauge. The iridium tips will almost certainly break off. They should come pre gapped anyways.

Scott2012
08-12-13, 12:56 PM
Good job! Agreed.....battery and dip stick removal are totally not necessary.

Iridium plugs should not be gapped with the small metal disc gauge. The iridium tips will almost certainly break off. They should come pre gapped anyways.

Well, I had to gap mine... They were anywhere from 0.36-0.38. They needed to be 0.40.
Most of the time pre-gaps are ok, but its always good to double check :)

BigDaddy-V
08-12-13, 03:53 PM
Scott2012,

Ay word on how she is running overall with that combo yet? Wanting to do mine in the next week or so before work gets going crazy.

BDV

Scott2012
08-12-13, 09:30 PM
Scott2012,

Ay word on how she is running overall with that combo yet? Wanting to do mine in the next week or so before work gets going crazy.

BDV

It runs great! I can't say there's a huge noticeable difference, but it fires up on start quicker, and I had a very very light rough idle that was barely noticeable, that's gone now.
So overall I'm happy, plus wont have to do it again for a while- always good maintenance

Naf
08-13-13, 03:34 AM
My own opinion, but MSDs are crap.

I had all my sets fail due to heat issues. I now am using taylor and grantelli. They look like stock wires but offer better insulation and heat protection.

NGK are good plugs, but i took it up a notch and got the double ground R editions. Bosch is good, but these have thicker grounds so i dont mind revving the crap out of them...

BigDaddy-V
08-13-13, 09:33 AM
Naf,

What granatelli wires are you using? I have looked into these too or the magnacore wires but didn't know if I wanted to drop the money on them or not if they didn't really give any more!

BDV

Scott2012
08-13-13, 07:49 PM
Ive had great luck with MSD in the past and also Taylor. But it's good to know others have had issues with heat... I'll keep and eye out and report back if there is any failures or issues.

Naf
08-14-13, 05:20 AM
Naf,

What granatelli wires are you using? I have looked into these too or the magnacore wires but didn't know if I wanted to drop the money on them or not if they didn't really give any more!

BDV

I am using Granatelli 28-1811HTR 2005-2012 GM 6.0L/6.2L LS2/LS3/LSA/

They come prepped and ready for the heat...

May smuggle a set onto my brothers vette

thefulmonty_07
08-14-13, 07:16 AM
I'm running the same set up(NGK&MSD) with some heat sleeves...no issues and runs great.

Scott2012
11-23-13, 01:40 AM
Well, the V is in for the winter... So far the MSDs w/o stock heat shields holding up great!