'94 Ford 4.6 Spark Plugs

[Fifth87]

Just purchased a '94 Grand Marquis, story and pics to follow at a later date.
I am uncertain if the plugs have ever been changed, and with all I have heard/read about the 3 piece plug, threads pulling out or ejection, I am electing to pay to have this done. My question is this: Did Ford ever modify the plug design, so going forward I can change them myself without fear of breakage?

 

[Number_35]

My '07 F150 4.6 2V spit a plug randomly one day, so any model year can be affected

D

Thread 'Ford 2V spit a plug'

May 13, 2023

'07 4.6 in F150. About 235k miles

Yesterday it spit the #3 plug.

Can anyone identify this broken metal piece? It's .2485" with calipers, not mic. Edit: it's magnetic, thus ferrous

I still get 140# compression on this hole so valve stem seems unlikely?

The spark plug is in intact. The strap is closed up but other than that I can't make out an impact mark to the outside of the strap (if it appears so, it's just glare from camera/lighting)

• D60
• Replies: 16
• Forum: Mechanical/Maintenance Forum

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Is it still OK?

 

[D60]

Is it still OK?

Yeah I just torqued a new plug and it's been great since '23

 

[ARCOgraphite]

Denso plugs are trash, 2 sets of IT24s and both were total junk compared to NGKs.
Ford doesn't use Denso plugs on their supercharged builds for a reason.

Yeah, I have seen some nasty Denso TT out of the box last decade - far cry from the excellent OE Nippon Denso Toyota and Hot-U days in the 90's. NGK green stripe USA V power were garbage also.

Just saying - If you have waste spark they tend to run better with twin tips.

Wires? there used to be only one good carbon wire maker - Packard. Must be Secret sauce in the insulator.

These 4.6 engines don't make any power stock. less than 100 hp per bank. Used to call 'em two escorts joined at the hip