Plug change time
 

Well since i have 153k I think its time.And yes they are the original plus and the truck is a 01.What should I be using since its bone stock.What plugs are stock?

try Autolite Double Plat. thats what i use. stay away from Bosch though, i tried them on my truck before and it didn't like em.

when i had my mustang that car hated autolite plugs

our trucks come with motorcraft stock, Ive heard that autolite and motorcraft are basically the same thing. If you want to play it safe just get motorcraft ones.

THEN AGAIN...i have a 3.0, i don't know whats exactly recommended for a 4.0

bump. What is the best spark plug for the 4.0l SOHC? I was thinking autolite double plat., but does anybody have a part # or something. I dont want to get the wrong plug.

if you don't like what the parts store gives you (most likely champions) just ask them if they have the motorcraft plugs for your truck. or go right to ford.

I just went to Ford and got the factory platinums.

Motorcraft plats

motorcraft plugs for sure. dont waste your money on bosch.

I'll be installing the NGK V-Power TR55 3951 tomorrow so hopefully they work good for me

Replaced mine at 50k with Autolite Double Platinums......... and just a word of advice, have the parts store cross reference vs. the part number in the manual........ Autozone showed they didnt stock the plugs I needed until I gave them the actual part number..... crazy computers.....

ill go to Ford dealership this weekend and probably pick some up.

I used Autolite Iridium plugs

UMMMMM yea ^ these plugs wont work i ended up going to ford and getting SP412 since there were a heat range cooler and instock and

NGK V-Power TR55 3951 .054
NGK G-Power Platinum TR55GP 3403 .054
NGK Laser Platinum PTR5F-11 6579 .054
NGK OE Laser Iridium ITR5F13 6044 .054
NGK Iridium IX TR55IX 7164 .054

maybe none of those will work

i replaced the plugs in my 4.0 with motorcraft plugs... sp440

i switched to champion copper plus spark plugs
and my fuel has shot up
i am getting 151 kliks before my fuel gauge even starts to move now

Did you notice any difference in performance? Also what type of driving are you doing? (highway, city)

both
idle is very smooth now
acceleration is kick ass
engine fires after the 2nd crank ( usually took 5 or more with the factory iridium plugs )
my fuel ecomony is still rising

i use Bosch 4"s and my truck fires right up no problem 4,0 ohv 1998 162k miles

so champions are the way to go? Cause I am going to change mine this weekend and I have a 4.0 and was thinking about going with ngk v power plugs but now I read this

No, I never run champion in my vehicles. Champions are stuck to my lawnmowers. Autolite/Motorcraft is the way to go