Spit out a spark plug

[Stangman]

My buddies mustang starting popping. Found out the spark plug pushed thru the treads. Could not re-tap. Had to heli-coil it. Guy at tha parts counter said happens all the time on 4.6/5.4 motors. I never heard of it. Any one else? How do we run all that boost if this is common?

[2001GTTT]

its very very common ive known a few people that had this happen.

[Slow01GT]

Yeah its common. Happened to my buddy a few months ago.

[Wolfpack Speed]

My buddies mustang starting popping. Found out the spark plug pushed thru the treads. Could not re-tap. Had to heli-coil it. Guy at tha parts counter said happens all the time on 4.6/5.4 motors. I never heard of it. Any one else? How do we run all that boost if this is common?

I have a cobra here at the shop right now for the same thing. This actually happens quite a bit for different reasons...

[03 OW SVT]

Just happened to me in March. Its fixed now and runs like a champ:D

[Ares]

My dads 2001 F250 with 5.4 blew one out. Destroyed coil and I had fixed it with a Heli-Coil sleeved thread insert but that lasted exactly a month before same cylinder did it again. Ripping the plug/insert clean out of head. A mechanic was able to borrow the repair kit off a Ford dealer and fixed it for my dad for $155 including new coil and plug again.

I'm keeping track how long this lasts.

[chugger95]

I know the early 4.6/5.4 trucks had this problem alot. From what I hear there is only a few threads for the plug to catch. I also heard that Ford fixed the problem in the later years.

[03 OW SVT]

I know the early 4.6/5.4 trucks had this problem alot. From what I hear there is only a few threads for the plug to catch. I also heard that Ford fixed the problem in the later years.

3 threads to be exact for the early 03 Cobras