How often should you change your spark plugs is my first question. Second is what brand is a good one to go with other than stock. Gonna replace the plugs with the coil packs.

 

Personally, NGK is my plug of choice, inexpensive but very high quality, unless you go iridium, which is TOP quality, and pretty pricey at like $8-12 a plug.

 

I've been happy with Autolite. But unless you have some serious mods, it's really not worth spending top dollar for a set of plugs.

As far as how often? If it's not specified in the maintenance schedule, then i wouln't worry about it unless you have a performance problem or a misfire, or somthing of the sort, but no more than 50,000 miles. You will see mild performance and milage gains after replacing worn out plugs.

Spend an extra dollar or two on a spark plug gap tool, make sure your plugs are properly gaped before you install them.

 

I don't mind spending a little more on plugs if its worth it. As far as installation im not installing them going to have one of my mechanics at my work do it. Truck has 92,000 miles on it i just figured its time to change them and the coil packs also on it. Ill look at NGK and Autolites.

 

stick with your basic motorcraft platnum supressor. cant go wrong with em. always check your gap.

about 80k miles or manufacture specs as far as changing em. my brothers car recommended it after 50k.

 

I hate saying it, but some mechanics are lazy and will just toss in a set of plugs and call it good. Even tube ASE certified ones. Spark plugs are one of those simple things i'd rather do myself and know it's up to my standards. As far as the coil packs, I wouldn't replace them unless they need to be. Coil packs don't wear out like the old distributors do.

 

What he said. There is no reason you should change your COPs unless they stop working. They aren't cheap to replace, I think motorcraft COPs are like $40 each.

 

Agree 110% don't replace the cops until they are bad.

 

Motorcraft for everything. 03 trucks don't really have spark plug hole thread problems, so if you feel the need to change them, go ahead. As far as the coils go, they are pretty spendy, I wouldn't change them until they go bad. If you buy new coils, make sure they come with the boots and springs. The updated rubber boots keep rain water/condensation out better than the original stuff.

 

Oh i know about water getting in them had to replace 2 from water getting into them and misfiring them.