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Re: Ford 4.0l cracking porcelain on spark plugs
Posted to Technical Discussion Forum on 3/15/2005

Make that 5 that agree.

I've had success checking for a leak on this engine by pressurizing the cooling system after removing the spark plug.

Let it set for a while. Disable the fuel system. I place an inspection mirror by the plug hole and have someone cr... Login to read more.