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On my engine ('99, 360 v8 Magnum), I replaced the spark plugs less than 15k miles ago, because of misfires in cylinders 2 and 8. Those two plugs were badly corroded. Today I had to replace them again, and the same 2 were far more corroded than the others.

Because I have found evidence of a head gasket leak (burned coolant smell in exhaust and loss of coolant), I was thinking perhaps the coolant was getting into those 2 cylinders and causing faster corrosion. Is that likely? If not, what's causing the rapid deterioration?

Cylinder 8's plug: enter image description here

Cylinder 2's plug: enter image description here

All the plugs: enter image description here

J. Musser
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2 Answers2

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What you see could very well be burned coolant as well as oil. As the glycerin burns in the combustion process it can take on corrosive properties that degrade the electrodes.

Typically with oil in the combustion chamber you don't see as sever of a an electrode degradation as illustrated in your photos.

I think your head gasket change is looming and should probably get done sooner rather than later.

IMO this is a combination of both coolant and oil in your combustion chamber.

DucatiKiller
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i am sure the engine gasket, pistons rings or cylinders are the problem. if you have high mileage are the rings or cylinders,if you run the car without coolant or is running hot is the gasket. the worst case scenario is a crack in the engine block

edmond
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