Champion plugs and misfire 5.4L 3v MUST READ
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Champion plugs and misfire 5.4L 3v MUST READ
If you recently installed the one piece Champion plugs part number 7989 and are experiencing misfires you need to double check the plugs.
Basically what happened to me is the porcelain broke inside the tip of the plug and it was sliding up and down causing a short inside the plug.
The plug may look perfectly fine, but using your finger nail, try to move the porcelain up and down. Movement is BAD. I do not know if this happened in shipping, manufacturing or installation but you need to check your plugs.
Read more here about my troubles here:
https://www.f150online.com/forums/en...-stumbles.html
Basically what happened to me is the porcelain broke inside the tip of the plug and it was sliding up and down causing a short inside the plug.
The plug may look perfectly fine, but using your finger nail, try to move the porcelain up and down. Movement is BAD. I do not know if this happened in shipping, manufacturing or installation but you need to check your plugs.
Read more here about my troubles here:
https://www.f150online.com/forums/en...-stumbles.html