2.4 Headgasket failure

It only has 76,000 miles on it. Today, it started running rough. I opened the hood, and the spark plug wire for Cyl #2 was completely off. I started the engine, and the plug wire came off again, and moved up and down with piston movement.
The plug, is still tight. I am guessing a headgasket failure may be causing this. There is also a puddle of oil on the valve cover, around the spark plug wires.
As this is a 2000, so it should have the MLS headgasket that was phased in during 1999. Early 2.4's were prone to headgasket failure, so this new design was introduced.
Any thought on this? Could it be something more involved than a headgasket?
Thanks,
KM
Reply to
KirkM
KirkM writes:
I'm kind of missing how a blown head gasket would cause a plug wire to fall off, or would cause an oil puddle way up at the valve covers. Also, how do you know the plug wire is actually moving "with" piston movement, or is it just wiggling when the engine is turning?
First thing I'd do is inspect the plug wire. Could the connector to the plug have failed? I'm not familiar with the 2.4, so I'm assuming it's either got a distributor or a coil pack (not coil-on-plug) so you're talking about traditional plug wires.
Second would be a more serious inspection of the plug. It's hard to imagine it failing in a way that would create a passage for gasses to go up and blow the wire off...
Not that this is terribly relevant, but my '78 Newport had a couple of plug wires that fell off continually until I gave up and put a loom on to keep them from swinging around so much.
Reply to
Joe Pfeiffer
Turns out that it was a cracked spark plug, allowing compression to escape and blow off the plug wires.
The valve cover gasket was leaking oil pretty back, so I am not sure if that caused the plug to crack. A new valve cover gasket, plugs, and plug wires, and it is running well again.
From what I hear, the newer MLS headgasket holds up pretty well.
Thanks,
KM
Reply to
Kirk Matheson
blow off the plug wires.
Glad you got it fixed; I was about to post that I have had spark plugs do exactly that!
Reply to
GP49
GP49 writes:
and blow off the plug wires.
OK, I guess I need a better imagination!
Reply to
Joe Pfeiffer
cape and blow off the plug wires.
wow, that would make a nice question for "car talk".
Reply to
u c coskun

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