04whitescab

How can I tell if my spark plugs are the original or if they have been replaced without taking them out?

Is there a way to look at the top of the plug under the COP and tell if my plugs have been changed?

I don't want to tackle the spark plug change job not knowing. If there is a way to know if they have been changed then that would be a big relief off my shoulders. I am worried to start the change and they be the originals and they break. The truck has 134500 miles on it so I would assumed they aren't the original ones(sure as hell hope not).

Basically, will there be any coloring I need to look for? Will the hole be dirty or anything? I took a quick look and they looked pretty new, clean and white but I would assume they would stay clean with the coils on top.

Any info is greatly appreciated.

SuzukiRider

Original Ford plugs have a white or blue dot on the top.

adamv7010

Do any of the replacement 2 piece plugs have any distinctive markings?

04whitescab

I looked and mine didnt have a white or blue dot on the top..it was just that bronze/gold looking color..does this mean that there is a good chance that they have already been replaced?

BkoJoe

how many miles are on the truck and how many miles were on it when you bought it? and is it having some misfire problems or anything?

SuzukiRider

Im not sure about the two piece design I havent paid that close of attention to them, but in all my Motorcraft seminars they say they mark the plugs.

Youve gotta be realistic about the plugs; if you have 80k and they look new then they probably arent original.

ellis4pa

will this mark be on the ceramic?

04whitescab

Had 130k when I bought it and I have put about 4-5k on it now. I would hope they have been changed by now. And I am not having misfires but have drastically decreased mpg. I am getting about 10.5 mpg. I was thinking of changing my plugs and O2 sensors.

Last night I was giving gas and it started stuttering pretty bad and wouldnt gain any speed(Like it was choking). Came to a red light and when I went again I didn't have the problem.(I would guess this is the fuel filter? I really don't know honestly)

And I am trying to be realistic but it has the rubber coil pack over the top, so in theory/realistically it wouldn't be dirty no matter how old it is; that is my thinking. That is why I am asking.

otto457

With the symptoms you're describing plugs and COPs check should be first. Try some of these tricks to avoid breaking.

https://www.f150forum.com/f4/my-spar...tricks-139763/