4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Blew a spark plug and COP clean out of the head

Old 10-23-2012, 03:26 PM
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Originally Posted by cliffyk View Post
The recommended torque is 11 lb-ft, this is from the 2000 Shop Manual:

Plug manufacturers usually say 13 to 15 lb-ft, or 1/16th turn for 14 mm tapered seat plugs; 1/4 turn got you up to 45+ lb-ft

If you have not already done so you need to remove and re-torque the other seven...
That is a very good pictoral representation!

For the record, the 1/4 turn is intended as a guide for older flat seat plugs with the crush washers. The 1/4 turn was to fully crush and seat the washer.

Newer tapered seat plugs that don't use a crush washer need far less TQ to be secured.
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Old 10-23-2012, 05:17 PM
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Yes, and the 1/4 turn was for NEW plugs with new crush washers, 1/10th turn for used plugs/washers...
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Old 10-23-2012, 06:14 PM
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Just got the car back and it feels great! I didn't realize how much power I was missing, especially down low. Whether that's from the the new FRPS, COPs, spark plugs, etc I can't tell, but it was worth the wait.

Now time for the brake and engine accessory upgrades...
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Old 10-23-2012, 06:37 PM
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+1 to that. I am slowly combing over mine, tho it's got more power then any car i've ever owned
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Old 10-24-2012, 09:19 AM
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Originally Posted by Syracuse315 View Post
Sorry, I missed the picture (didn't show up when I looked on my phone). You can see the same feature on the middle of the ceramic portion too. I'm assuming melted/sprayed metal wouldn't stick very well to that type of surface.

It's going to be 1000x easier to tell once I get to the shop and either those marks are going to be gone (if it's water), or there is going to be metal still there.
I checked out the spark plug and there is no melted metal. I'm assuming the droplets were just rain. (whew)
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Old 10-25-2012, 10:01 PM
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Hopefully all goes well.

I did a helicoil in my 99 and just spit out another plug shortly after.

I did learn a hell of a lot doing the cylinder head replacement though
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Old 07-22-2015, 11:29 PM
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CliffyK, I know this is old but do you have any more info on that spark plug socket? The links you provided no longer work. Im doing plugs soon on my 02 GT and want to do it right the first time. Thanks.
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