Changed my Mustang spark plugs today {Gt S-197 4.6L}

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Apr 29, 2015 | 12:22 PM

#21

SpeedCostsMoney

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Joined: April 26, 2012

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From: Charleston, SC

I was about to change my plugs myself. Any issues with the 2010 GT's plugs? I assume since it was a late 4.6 they had worked all the bugs out of it.

Apr 29, 2015 | 05:07 PM

#22

pmbss396

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Joined: April 5, 2015

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2010 should not have these problems.

Apr 30, 2015 | 01:03 AM

#23

m05fastbackGT

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Joined: May 11, 2006

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From: Carnegie, PA

Quote:

Originally Posted by SpeedCostsMoney

I was about to change my plugs myself. Any issues with the 2010 GT's plugs? I assume since it was a late 4.6 they had worked all the bugs out of it.

Ford changed the plug design during the job 2 2008MY model year, as they went back to the standard 12mm one piece design and also revised the heads to correct the bugs involved with the 2005- early 2008 models which had the 2 piece 16mm high threaded plugs that were prone to breaking inside the heads..

Apr 30, 2015 | 01:06 AM

#24

m05fastbackGT

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From: Carnegie, PA

Quote:

Originally Posted by 05YellowGT

Rocky, Brisk makes a one piece plug and has them in 1 & 2 heat range colder.

Thanks Steve, I totally forgot that Brisk offers them in both 1 & 2 degree colder heat ranges

Apr 30, 2015 | 04:49 PM

#25

Scarpi

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Joined: October 17, 2004

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From: Phoenix, AZ.

My Champion 7989 plugs are doing fine. Car runs great.

Jun 14, 2025 | 05:37 PM

#26

m05fastbackGT

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From: Carnegie, PA

Just a follow up for those who have questions/concerns about changing the dreaded 2-piece 3v design spark plugs for all 2005-early 2008 GT models... Watch this YouTube video provided by Autolite which covers all the recommended procedures by the manufacturer when changing out spark plugs properly in order to prevent any potential plug separation from taking place during the extraction process...

In the meantime, hope you'll find the video as a useful tool resource...