Ok, I just ordered my motorcraft spark plugs and wires from Rock Auto a couple weeks ago and have been waiting for a chance to put them on.

I pulled out a spark plug off the truck (passenger side, closest to cab) and it was a bosch platinum +2 4305. The replacement plugs I got are Motorcraft SP-498 platinum plugs. Both are correct fitment for my truck according to Rock Auto, but here is what they look like.





Did I order the wrong plugs? Was I running the wrong plugs this whole time? My brother had a shop replace the plugs about 30k miles ago. The truck has been running fine except for eating gas (approx 15 mpg). Let me know what ya guys think.

 

i think whoever owned it before just put dif plugs in it like the plat 2 instead of the reg ones we use just adds more spark i belive :) i might be wrong but i dont think i am altho i have been wrong before lol i use the same motorcraft ones tho in my truck as well

 

it should run about the same also :)

 

I figured if RockAuto says both numbers will work it should be fine... I was really more concerned about the length of it. Maybe the bosch one is short because it gets hotter? Hell, I don't know, lol.

 

Didja try it? they look like they'll be fine.

 

o yea just noticed that the other one is shorter lol i dont thin it will matter tho

 

you have the right plugs......those bosch +2 plugs are complete junk.

 

ive never tryed em always put motorcraft stuff back into my fords lol

 

Well, put em in there as well as some new motorcraft wires... hesitates to start at first, then fires right up and if i give it any gas (in park)... it sounds like it's missing or something. Not rough, but enough to shake the truck a little. I did also just put in a new PCV valve... hmmmmm.... any thoughts? I am double checking I ran the wires correctly as well. No CEL either.

 

hmm very wierd sounds like u have the wires messed up but u said u dont lol let me look into it a bit and ill let u know unless someone gets to it before me lol or u figure it out lol

 

If it isn't too hard to get to them... swap out the new wires with the old wires one at a time to see if you can narrow it down to a bad wire. I bought a set of MSD wires back when I had my Mustang and I had a bad one out of the box. The clip that attaches to the plug wasn't connected properly to the wire.

 

I think I'm just stupid maybe... haha. It was only doing the "missing" when it was park or neutral. I think I remember reading a while back that there is some sort of rpm limiter when it is not in gear. I could be wrong, but if I'm right then that was the issue I think. It was almost exactly at 3000 rpms.

I took it down the road and it ran fine... so I think I'm in the clear... and still no CEL. So... new plugs/wires, PCV valve, cleaned the IAC and MAF again, and rotated the 2 front tires... so my truck loves me again. Any idea if I should have swapped out the coil pack? or should it be ok if it's not having issues? Not sure what interval that should be done, if it needs to be done at all.

 

good to hear :) and u shouldnt have to change ur coil pack that i know of at least :)

 

Good to know. I'm just preparing the truck for a 2300 mile road trip back home to Indiana where it will be stored and rarely driven for 2 years... don't want any issues on the way back so doing maintenance stuff now.

 

There's a rev limiter in neutral and park at around 3000rpm

 

and.. confirmed... I forgot about it. I thought I broke my truck when it first happened... eek, lol.

 

lol good glad it wasnt anything major :)

 

I wouldn't bother changing the coil pack unless something happens that leads you to believe it's going bad!

 

What did you gap them at? I did mine recently and had a heck of a time decided to gap at what everyone says or what the sticker under the hood says? Ford told me i was crazy when i told them the sticker says 072-076 or something like that.

 

I gapped them at .54 or .054... whatever it called for. Not sure where the decimal place is, haha.

 

ya thats it. Thats what i went with, i swear the gas mileage went down but power went up. I Just hit the 100K mark and did them. All motorcraft and its running great.

 

The decimal is .054. Fifty-four thousandths. .54 would be over a half inch. one hell of a spark plug gap

 

Stay away from the Bosch plugs, they are garbage.

 

I did... I went with all motorcraft OEM stuff.