#3 Cylinder Spark Plug Came Out Looking New

Picking your brain. I have no misfire, no codes, no smoke, no water in oil and visa versa. Engine runs fine but when I change the SPs all were normal were except #3 which came out looking new. What can cause this issue?

 

Are you losing coolant?

 

No coolant loss

 

Smell it. Fragrance du coolant? If it's "steam cleaned", only one way that happens.

 

Did you buy it new? If not, maybe the PO was chasing a #3 misfire and only replaced that plug so it is cleaner than the rest?

 

Bought brand new. First SP change. Good thought. I also do all my maintenance work, no one else has touched this.

 

Maybe it was new and you put the old one back?

 

That's a good thought, but I'm sure it was what I pulled out. I always check the plug when I remove them.

 

I do appreciate all these comments, it is very strange and I have never came across this situation w/o a misfire or running condition.

 

First of all I want to thank everyone that responded. It made me think about it. The issue was I changed #1 twice and never changed #3. OPS! Bonehead mistake but I'm admitting it. Mistakes happens. Thanks again for the imputs.

 

Glad you found it. Reminds me of all the times I have laid down a wrench and spent an hour trying to find it when it was right in front of me. Everyone who has ever turned a wrench has stories like this.

 

Eh, it happens. Get my age and if you walk away from a project while in the middle of it, you had better take your time to get reoriented before you carry on.

 

Thanks guys. I have been turning wrenches a very long time and both of you are 100% correct. I laugh at this mistake.

 

If you leave them in there long enough, there will be no mistake when removing them. .
You'll know it, because they will fight the whole way out.

I might know a guy that that procrastinates when it comes to "turning wrenches".