what spark plugs in 04 gt

[bigbird04]

What plugs would you recomend for a stock 04 GT ? I've searched and motorcraft copper seem to be a good choice. Is there any chain auto parts store I can buy them at ? Also how about NGK TR55s ? Any sugestions,where to buy and part numbers would be greatly appreciated . The car has 98k on it and I just bought it , gonna do an oil change and figured I might as well do plugs too so I know what I've got there. Sorry for the millionth question on plugs and thanks in advanced for any help.

 

[Deleted member 38176]

I get mine from Americanmuscle. They only sell mustang-specific parts and the plugs pre-gapped for 4.6 motors.

1999-2004 Mustang Ignition Parts at AmericanMuscle.com - Free Shipping!

 

[Winters98GT]

Stock.

 

[trinity_gt]

Stock.

+1 for stock.

Make sure you tighten the spark plugs to spec using a torque wrench.

 

[flstang65]

+ another for stock

 

[Mustang5L5]

autozone sells motor craft spark plugs.


I'd buy Motorcraft plugs first, Autolites 2nd and NGK third.

Stay away from "gimmick" plugs like the Bosch +4

 

[Rejekt]

I went with Bosch Platinums +4.

 

[bigbird04]

Thanks, what is the torque spec and why is it so important to torque to spec ( I know in aperfect world every fastener should be, I work in a diesel engine plant as a QA tech) I've always just used a 3/8 ratchet and snuged them up in my previous cars before. I've never changed plugs in a 4.6 though. It looks like you have to remove the fuel rails, that sucks but it should be alot easier than changing number 8 on a f body though.

 

[Winters98GT]

Thanks, what is the torque spec and why is it so important to torque to spec ( I know in aperfect world every fastener should be, I work in a diesel engine plant as a QA tech) I've always just used a 3/8 ratchet and snuged them up in my previous cars before. I've never changed plugs in a 4.6 though. It looks like you have to remove the fuel rails, that sucks but it should be alot easier than changing number 8 on a f body though.

It is important because these heads are notorious for blowing out plugs. 13 pounds. Make sure not to strip the thread by overtightening.

 

[bigbird04]

Thanks for the fast reply Winters. I'll borrow a torque wrench from work since I don't have one at home.

 

[Rejekt]

I changed mine without removing fuel rails. Only tight spot was the ones closest to the firewall.

 

[bdcardinal]

Stock double platniums. No need for the cheaper copper, there is 0 performance advantage whatsoever on a stock application.