What Makes Spark plugs "eject"?

Greetings and Salutations

So the other night (morning), I'm driving home, on the interstate, when "Bang!" right in the middle of a lovely tuba solo, the spark plug ejects itself from the spark plug port. Well, actually, it wasn't till later that I determined that this, in deed, what had occurred. It just launched the ceramic portion of the plug - not very far, but out of the rest of the part

- and left me with a badly missing engine. Well, the engine was still there, but 1/4 the cylinders weren't participating in the process of delivering power to the drive train. Pollutants to the environment, but no power. I drove it back to work, and slept at a bud's place (I figure it is easier to walk 1.5 miles to work, than 65.2. Faster too.), and took it in for a Professional Opinion. (Which was, "Yep, need to replace the sparkplug. That will be a hundred dollars. You need to get the engine tuned too, and your rear tires are starting to get wore down.")

Okay, so the sparkplug failed to hold together under operating conditions, does any one have any explanation why this plug might have "gone west" (so to speak) in this fashion?

Oh yes, I'm driving a 1990 Ranger, 2.3 liter EFI, and I "just" had the plugs replaced during a tune up a year ago.

cheers pyotr

p.s. Taking a Ford into a Chevy dealership (it was that or nothing, small town), provides a number of opportunities for humor. "You do realize, that if I had a Chevy, this wouldn't have happened, and you guys wouldn't be getting paid for this?" . "cool" in a bizarre manner, but very disturbing, especially on the drive back.

Reply to
pyotr filipivich
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ROFLMAO!!!!!

Oh lord, I gotta catch my breath.

Kate

Reply to
SVTKate

The most likely explanation is that it was cracked sightly when installed and took a year for the crack to propagate enough to break off.

Reply to
Al Bundy

I would tend to agree but I have seen engiens with constant detenation problems spit a plug out on occaision.

Reply to
SnoMan

I never have seen one ejected however I have experienced a Bosch and a Champion that had cores loose and leaking gases. It does happen but I don't think it should. I am wondering if it might be worth complaining to the manufacturer of the plug. You might at least score a new set. Randy

Reply to
Randy Zimmerman

Took an automotive tune-up class at a local community college (20+ years ago). The instructor told us there was a reason that when you bought a box of "Champion" spark plugs there were 10 in the box when you only needed 8. Two of them were going to be bad right away, the ceramic portion liked to come loose even when new.

There have probably been great improvements since then and they are just fine now?

Reply to
I. Care

Let the record show that I. Care snipped-for-privacy@whocares.com wrote back on Sun, 14 Aug 2005 16:44:49 -0700 in alt.trucks.ford :

Of course. Now they last a lot longer before failing prematurely.

This was an ACDelco plug. I'm keeping it as a souvenir of some sort.

tschus pyotr

Reply to
pyotr filipivich

Let the record show that "Randy Zimmerman" snipped-for-privacy@shaw.ca wrote back on Sun, 14 Aug 2005 21:03:00 GMT in alt.trucks.ford :

It's been a year, so ... as we used to say at the Shop

"Guaranteed to not rip, rot, rust, bust, or throw dust; mildew, mold, chip, fade, peel, or crack. Good for thirty feet or thirty seconds, provided the customer does not touch the car."

It ran, it runs, it goes.

pyotr

Reply to
pyotr filipivich

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