Blew a spark plug on the way home... - Page 2

jwillburn119 · 01-07-2006, 08:48 PM

i guess this is just one guy's opinion... but it sounds more like the way i feel than anything else... i truely cant believe... without a screwup... that a spark plug would dislodge itself... physics doesnt agree... the hold strength of the head... and even more so the plug... is way beyond what a single cylinder ever undergoes... otherwise... over time (a short amount) you would reach catastrophic failure on every plain... especially head bolts... connecting rod bolts and in the mains...
http://www.cartalk.com/content/colum...9/June/03.html

Crzypny · 01-07-2006, 09:10 PM

Besides the bottom portion of the threads on the plug being completely destroyed, there is no gap at all left between the contacts on the spark plug.

coupe · 01-07-2006, 09:18 PM

I work with a guy who's Harley-Davidson supercharged F-150 did that very thing. He got some kit that allowed him to thread in a sleeve; he said it wasn't a helicoil. He did this with the head on the truck too...

Another guy I know had a Lightning do it...JB welded a plug back & traded truck in.

Italian LX · 01-07-2006, 09:24 PM

Quote:

Originally Posted by jwillburn119

i guess this is just one guy's opinion... but it sounds more like the way i feel than anything else... i truely cant believe... without a screwup... that a spark plug would dislodge itself... physics doesnt agree... the hold strength of the head... and even more so the plug... is way beyond what a single cylinder ever undergoes... otherwise... over time (a short amount) you would reach catastrophic failure on every plain... especially head bolts... connecting rod bolts and in the mains...
http://www.cartalk.com/content/colum...9/June/03.html

This is a very common problem in the new-edge Mustangs.

Italian LX · 01-07-2006, 09:27 PM

Quote:

Originally Posted by Scott Dunn

I can usually repair the coil pac with a little JB weld and black paint.

There's is no way in hell he could've repaired the coil pack from the '99 Cobra we did.

QWKSNKE · 01-07-2006, 10:02 PM

Quote:

Originally Posted by Italian LX

This is a very common problem in the new-edge Mustangs.

Actually very common with the 4.6's and 5.4's.

Quote:

i guess this is just one guy's opinion... but it sounds more like the way i feel than anything else... i truely cant believe... without a screwup... that a spark plug would dislodge itself... physics doesnt agree... the hold strength of the head... and even more so the plug... is way beyond what a single cylinder ever undergoes... otherwise... over time (a short amount) you would reach catastrophic failure on every plain... especially head bolts... connecting rod bolts and in the mains...

it happens on these motors because there is only 3 threads in the head to put the spark plug in certain year mod motors. I believe around the 03 model year ford corrected this

coupe · 01-07-2006, 10:26 PM

Mark; would be a good time to get some heads for sure. Check VT Engines.

joker · 01-07-2006, 10:26 PM

Quote:

Originally Posted by jwillburn119

i guess this is just one guy's opinion... but it sounds more like the way i feel than anything else... i truely cant believe... without a screwup... that a spark plug would dislodge itself... physics doesnt agree... the hold strength of the head... and even more so the plug... is way beyond what a single cylinder ever undergoes... otherwise... over time (a short amount) you would reach catastrophic failure on every plain... especially head bolts... connecting rod bolts and in the mains...
http://www.cartalk.com/content/colum...9/June/03.html

As Lee, and Brian said it is a common problem with the mod motors due to the lack of threads to hold the plug in. Mark is about the 4th person on this site alone that has had a 4.6 shoot out a spark plug. Mine was lucky, and I didnt have to ahve the head repaired, but most are not so fortunate.

1sicklx · 01-07-2006, 11:32 PM

Quote:

Originally Posted by coupe

Mark; would be a good time to get some heads for sure. Check VT Engines.

that's what I said too

EZ SPEED · 01-08-2006, 04:53 AM

Quote:

Originally Posted by QWKSNKE

Actually very common with the 4.6's and 5.4's.

it happens on these motors because there is only 3 threads in the head to put the spark plug in certain year mod motors. I believe around the 03 model year ford corrected this

There are 4 threads in the older 2V 4.6 and 5.4 heads, early 03 engines got the 8 thread heads

Keeping a check on the tightness as well as using anti-seize goes a long way to keeping the plugs from ejecting.

01-07-2006, 08:48 PM	#11
jwillburn119 Senior Member Join Date: May 2005 Location: temple, tx Posts: 240	Re: Blew a spark plug on the way home... i guess this is just one guy's opinion... but it sounds more like the way i feel than anything else... i truely cant believe... without a screwup... that a spark plug would dislodge itself... physics doesnt agree... the hold strength of the head... and even more so the plug... is way beyond what a single cylinder ever undergoes... otherwise... over time (a short amount) you would reach catastrophic failure on every plain... especially head bolts... connecting rod bolts and in the mains... http://www.cartalk.com/content/colum...9/June/03.html __________________ Whats in your WALLET?

01-07-2006, 09:10 PM	#12
Crzypny Senior Member Join Date: Aug 2005 Location: Hoover, Al Posts: 576	Re: Blew a spark plug on the way home... Besides the bottom portion of the threads on the plug being completely destroyed, there is no gap at all left between the contacts on the spark plug.

01-07-2006, 09:18 PM	#13
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: Blew a spark plug on the way home... I work with a guy who's Harley-Davidson supercharged F-150 did that very thing. He got some kit that allowed him to thread in a sleeve; he said it wasn't a helicoil. He did this with the head on the truck too... Another guy I know had a Lightning do it...JB welded a plug back & traded truck in. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

01-07-2006, 10:26 PM	#17
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: Blew a spark plug on the way home... Mark; would be a good time to get some heads for sure. Check VT Engines. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein