Help! Spark Plug keeps blowing out of engine

Kurgan · Dec 9, 2003

This usually happens when a cylinder goes lean, and is especially more prone to happen with a turbo or supercharger on the car. It can happen on an N/A car if you're under full load and the motor spikes REALLY lean (probably over 16:1 or 17:1 AF).

Slithering_Joe · Dec 9, 2003

White360RFnSwee said:
real classy guys.. just rip on him when hes trying to get help. Granted, I think the car looks hideous with that crap on it, but why the immaturity? Grow up.

-Ryan

You just joined their club. Congrats!

san~man · Dec 9, 2003

IronD01GTvert said:
Now when it happened to you did the threads strip out? Mine dont seem to be stripped, although I havent really had the chance to get a really good look at them. The plug threads in no problem without being loose, so i dont think they are stripped. Unfortunately my car is out of warranty, with aftermarket plugs and they game me trouble for my nitrous the last time I went to ford with a cracked intake manifold.

Of course the threads are stripped, why else would the plug keep coming out? Although your plug threads in "ok," the threads are bad.

Ford engineered their heads with a poor design (according to my mechanic/service manager). Instead of the ususal 6 or 7 threads, there are only 3 or 4.

So, you can try the warranty route, and if that doesn't work, the helicoil route will work too.

IronD01GTvert · Dec 9, 2003

Ok so I was using Denso Irridium plugs when they blew out, but the second time i replaced them with bosch copper cheap-os. Also I wasnt driving the car hard when it happened, nor have i driven it hard for a while. I will probably have to go the helicoil route, but what the hell is it and where can i get it, also is it omething i can do my self or am i going to need to see my mechanic and have him do it?

merc123 · Dec 9, 2003

White360RFnSwee said:
real classy guys.. just rip on him when hes trying to get help. Granted, I think the car looks hideous with that crap on it, but why the immaturity? Grow up.

-Ryan

That was the reason I left the forums for my car...

merc123 · Dec 9, 2003

Probably stripped the threading some how. Maybe the pressure from the NOS?

rx7speed · Dec 9, 2003

it might be worth a shot to at least take the car back in there for this fix and see what they have to say
though you might want to take the nitrous out if you do it

tontot77 · Dec 9, 2003

look here ... these guys are wise.

http://www.turbomustangs.com/forums/showthread.php?s=&postid=107822#post107822

Slithering_Joe · Dec 9, 2003

tontot77 said:
look here ... these guys are wise.

http://www.turbomustangs.com/forums/showthread.php?s=&postid=107822#post107822

It wouldn't surprise me if Ford in order to save a few pennies in tooling and casting material, to cheap out on a head.
I will be amazed if Ford is still in business in 10 years. Pretty soon there will be no such thing as an American manufacturer anymore.
...Or, maybe they are so desperate to make a buck because the UAW is sucking them dry!

scothew_gt · Dec 10, 2003

And alot of these comments are the reason why I quit coming to Stangnet.

Anyway onto my perspective. I had the same thing happen. spark plug shooting out of the head. Even though you think the plug is threading in, and tightening up properly, 90% chance that it isnt. Its probably cross threaded due to fouled up threads. You dont want to run it that way at all, it will just screw up worse.

What I had to do in this situation since my warrenty company (3rd party, not ford) wouldnt warrenty my car (i had copper motorcraft plugs in vs. the stock platniums). I ended up pulling the head, taking it to a cylinder head shop and they put a new thread in it. It was a steel sleeve that they put in there. In my guess, it was the strongest part on the entire head from that point. Didnt cost much either. I wanna say about $45 or so.

JonJon · Dec 10, 2003

scothew_gt said:
What I had to do in this situation since my warrenty company (3rd party, not ford) wouldnt warrenty my car (i had copper motorcraft plugs in vs. the stock platniums). I ended up pulling the head, taking it to a cylinder head shop and they put a new thread in it. It was a steel sleeve that they put in there. In my guess, it was the strongest part on the entire head from that point. Didnt cost much either. I wanna say about $45 or so.

How hard is it to take the head off?

scothew_gt · Dec 10, 2003

Honestly, I dont ever want to do it again since it was the drivers side head. It was difficult getting the head around the brake master cylinder. I am sure it wouldnt have been as hard since I was fairly inexperienced at the time.

Oh yeah, just an FYI, this all happened on my 2000 crystal White GT I had.. it wasnt on the cobra.

IronD01GTvert · Dec 14, 2003

Thanks to everyone who offed advice here. I Took the car to my mechanic and he Heli-coiled it for 70 bucks. Car has run great at all speeds and im almost ready to try squeezing again!

Help! Spark Plug keeps blowing out of engine

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