Oil on spark plug cover and misfire

[David Anderson]

The plug looks good to me. But I would swap the plug from another Cyilinder. I think you may have a coil problem. The oil on the plug is nothing to worry about at this time. That is another problem. But a minor one.

Did you change the wires when you changed the plugs. ?

Yep. Tested the wires and their good as well as changed the coil also. That plug looked like that after two months. Here's another plug side by side. That's a plug from cylinder 1 on the left vs the plug from the misfire cylinder 3.

 

[#1taho]

Swap a coil and see what happens. That looks like Unburnt fuel. Not oil. Coils do go from time to time. Not very ofton but it does happen. Then put the plugs back to where they came from.

 

[retiredsparky]

Check compression. You may have oil burning on that plug. The sparking of the plug and combustion leaves the carbon deposit on the plug. It could be from worn rings in that cylinder.

Or, it could be an injector leaking excess fuel into the cylinder. Swap injectors and put a new plug in that cylinder.

 

[Brains646]

Did you ever get to the bottom of this problem?