Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Are you sure its a ping spark knock and not a rattle noise from a valve train concern?
Did 93 octane make any difference at all?
Thanks, ***** ***** spark knock, the fuel is igniting from heat and compression prior to the spark plug igniting the fuel. Running lean, carbon buildup, and high head temps can cause this. Remove a vacuum line from the intake as close to the throttle body as possible. Run the engine at 2000 rpms while someone slowly pours a can of sea foam into this vacuum line to fog the intake and cylinders to remove carbon buildup. Remove the thermostat and drain the coolant. Reinstall the thermostat housing without the thermostat and perform a flush on the cooling system. Install a new thermostat and new coolant. Try these things to see if they help.
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Since it occurs cold, that indicates incorrect spark plugs in use, though it extremely rare to get spark knock (ping) on a cold engine. It is looking more like a valve train noise.
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