I have a 2001 F150 with a 5.4. Is there an exact part number I need or did Ford use the same COP for the 97 - 05? I'm looking a picking up a full set off of the retailer on ebay. Their ad appears that what they are selling covers all years.

Also, when I go to replace them, any tips on making the job go smoother? Sounds like the rear cylinders are hard to change?

 

I believe the DG-508's fit all 4.6 and 5.4 2V motors.

 

just did mine, they wernt too bad. i had to lay down on top of my moter basically to get the back ones. make sure you have you dielectric grease and if you havent done so you should put new plugs in while your at it

 

I don't think you can say any certain part number is needed because it seems to change. After pulling mine, I looked at the two, way different number, top sticker, but size etc was dead nuts. So I fugure, what the hell. These were supposedly 2003 or so coils and they work great. I guess you gotta order without a specific number due to when the new ones were made I guess. The sellers usually list what they fit and it's alot. Lightning ones I think differ slightly.

So Brady, the truck run better with them in now? Hopefully.

 

97-03.

 

yup it quit stalling out. mine got pretty bad after i ran through a lot of water, wont do that again. whatever you do dont go to any kind of dealership unless you got money....alot of money

 

Not in every case, shop around, I find the dealer alot more reasonable on some stuff, average with most and only available at so do you're research.

 

I'm learning here, what exactly am I supposed to do with the dielectric grease? Also, any reason not to stick with Ford plugs? I'll probably replace the wires to if there not to expensive. The truck has 59,000 on it and hope to keep it another 5 years or so.

 

The special grease (Dielectric?) will seal the small space between the plug boot and the tip of the spark plug making a good seal keeping moisture out (That's your enemy). Keeping moisture out will ensure your are delivering the full amout of spark the the combustion chamber. Better performance = Better gas mileage! Do it on the COP side and the spark plug side, If you've got wires. FYI, the dielectric will not cause you to blow a fuse in simple terms or cause the spark to jump from the plug to the engine causing a mis. But normal grease will cause you problems, it will degrade the silicone boot and allow the spark to jump to the block and miss on that cylinder(s)! That's if I'm correct. And no! Keep the wire you have, that's not to many at all. You may start to think about a change @ 100k!

 

Try a new COP without grease once - You can pull just after 10 miles or so.

Inspect the inside , you'll see lines - lighter in color . Those are carbon trails.

Without grease your spark freaks the nasty inside the boots , going everywhere it shouldn't.

I don't know if the do now , but they use to call dielectric grease - "tune up grease" - I use to say , "yea right". Not only is it tune up grease , but it can net you ponies overall..

Grease the entire inside of the boots , don't worry if you get a little on the springs - won't hurt it a bit - pays to be liberal..

 

Thanks a bunch