Ford Motor Company
Ford Bad engine and spark plug design in 04-08 F150 5.4L excessive replacement costs
A Ford TSP on the plugs indicates Ford is aware of the poor engine and 2-part spark plug design Ford used in their 04 - 08 F150 5.4L 3V trucks.in fact acknowledged this awareness by reporting they fixed the problem in 2008. Nevertheless, of the hundreds of thousands of trucks Ford sold from 04 - 08 ...