Ref: the thread about the broken electrode in this forum -

yesterday my truck would barely run as I limped it to the shop (appointment to replace the muffler). The mechanic removed the #3 plug per the CELs.



i'm fixin to replace the lot of them - but fixing this plug solved 80%, 90% of whatever ticking I'd heard previously.

The Mechanic said the plug was loose and wobbly. The replacement plug fit fine.

 

What brand plug was in it?

 

I can't tell - but I can read ZH and 4F written on the ceramic.

 

Sounds and looks like it either worked loose or was never tightened properly

 

Twas a plug and coil replaced about six months ago by a shop; truck had same symptoms; barely ran. Had the head been damaged I would have brought them a bill to work something out.