spark plug left me lonely

L

lastnthebest88

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Soo I take a trip about 50 miles south in nj towards Pleasantville and get off the expressway and at the light a bang and a boggin' engine occurred. Spark plug shot right out. This happened b4 but this times the threads are messed this time so my day off has a schedule. What is happening? Had it on cruise at about 80 or so no stressing it and i keep up on the maintenance.FML
 
Very common on the 4.6 4V motor. I had it happen twice in my Marauder and I have heard many Marauder owners have the same issue. Its also common on all the 4.6 2V and 5.4 Ford mod motors. They only have 4 threads holding the plug in. The torque setting is 10 ft-lbs with some anti-seize on the threads. The first time was on my way to Indiana about 75mph when I picked up a serious vibration and a tapping noise. I got lucky and was able to re-thread the plug back in. Last time the plug shot out of my engine, the cylinder filled up with gas, it ignited from the hanging coil, detonated and broke the piston. I fixed the thread and had a bad knock in the engine. It was so serious that I had to get a sleeve and ended up boring the block out and went with forged pistons. I also had the machine shop put steel thread inserts in the head to prevent it from happening again.

If you hear a light ticking noise that sounds louder then the normal 4V valvetrain noise, that likely a loose plug. I ignored it and $5K later I learned to be in tune to any kind of tapping noises.
 
cant you just unplug the fuel injector if a plug pops out and your far from home?
 
I would not say it common. At least not in a Mark. In all the years I have maybe read about 3 cases and typically they used Bosch plugs.
 
unity said:
I would not say it common. At least not in a Mark. In all the years I have maybe read about 3 cases and typically they used Bosch plugs.
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+1...mostly a 2v issue, v10s are the worst.
Fixed in 2003 FWIW.
 
yea like i said i had a 50 miles trip or so and i unplugged the injector and took the ride. The first time it happened i was lucky enuff to find the plug and thread it back in becuz i was in eastjabumblef**k, PA. Doing a heli-coil today.
 
Reason I haven't put new plugs in my Mark when it hit 100k.

Just afraid I'll have one plug do this to me and of course it will be the hardest one to get too :mad:
 
Happened to me a few weeks ago with some motorcraft plugs. #8 cylinder. Luckily I had a few plugs in the trunk from "the greaT misfire hunt" because it was beat up pretty good by the time I pulled over.
 
2002WRXSTi said:
Reason I haven't put new plugs in my Mark when it hit 100k.

Just afraid I'll have one plug do this to me and of course it will be the hardest one to get too :mad:
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Bah, I've changed mine enough times, if one was gonna blow it would've happened more than once by now. :rolleyes:
 
driller said:
Bah, I've changed mine enough times, if one was gonna blow it would've happened more than once by now. :rolleyes:
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True but I just fear that someone hasn't done the plugs on it before hand and didn't anti seize them when they did it :(
 
knock on wood for my V10, But then again it is a New 2004 model crate motor.


My 98 spit plugs left and right, till I thred-sert'd em. The 94 did it once.

New Mach engine has been good so far.
 
Dads 06 4.6 f150 did it and my bosses 03 navigator did it too within a week of eachother lol
 
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