Spark Plug Analysis Help (1 Viewer)

[DesertCruiser80]

Hello Mud,

I took off my spark plugs from my 92 3FE to see what condition they were in and see if everything is normal. What prompted me to do this was coolant loss so I want to triple check its not HG failure, before replacing everything in the cooling system. These plugs were put in about 6000 miles ago/2 years ago. Please let me know what you think. Plugs are ordered 1-6 top to bottom.

Note: I noticed plug 4 was "wet" on the threads and on the surface of the head. I'm 90% sure its oil, but I could not tell for certain.

 

[BILT4ME]

How about a better pic of the electrode end?

Initially:
#1,2,5,6 look good. No issues

#3 is running rich and maybe a little oil.

#4 may have a little oil, but nothing much.

I see nothing there indicating HG.

 

[Kernal]

For comparison, here's a previous thread showing some really bad plugs:

Fouled worn spark plugs

Recently picked up a neglected 95 FZJ80 and have been going through the PM one area at a time. So just pulled the leaky valve cover to replace the gasket, found it to be cracked and shrunken as expected. Spark plug tube seals, ditto, cracked and leaking, oil in most of the tubes. Removed the...

forum.ih8mud.com

 

[DesertCruiser80]

How about a better pic of the electrode end?

Sure thing. 1st is 1-3 (L to R), 2nd is 4-6 (L to R)

 

[BILT4ME]

Sure thing. 1st is 1-3 (L to R), 2nd is 4-6 (L to R)

View attachment 2474006

View attachment 2474007

I stand by my first statement.

 

[DesertCruiser80]

I stand by my first statement.

Fantastic! Thanks for the good news and quick help.

For comparison, here's a previous thread showing some really bad plugs:

Fouled worn spark plugs

Recently picked up a neglected 95 FZJ80 and have been going through the PM one area at a time. So just pulled the leaky valve cover to replace the gasket, found it to be cracked and shrunken as expected. Spark plug tube seals, ditto, cracked and leaking, oil in most of the tubes. Removed the...

forum.ih8mud.com

Yikes, those look scary!

 

[1911garand]

Looks like them plugs are good for another 60K.