spark plugs...

[35thstang99]

just got new spark plugs wanted to make sure they are the correct ones in the book there were two numver ap 104s and ap 764s...i got the 104s is this fine?

 

[40th GT]

They should be fine. I think the 764's replaced the 104's.

 

[35thstang99]

ok sounds good thanks

 

[Mustang5L5]

You could also use Motorcraft SP-493's.

Autolite makes the plugs for motorcraft, so they are the same plug but the motorcrafts are tighter specs. I prefer motorcraft over Autolite

 

[gotchopsticks]

make sure you torque them correctly, and again in a few hundred miles or so. i guess i skipped one on the second pass of torqueing and ended up blowing it out of my head. costs a pretty penny to fix...

 

[40th GT]

Yeah, get'em to about 10-14 ft-lbs.

 

[gotchopsticks]

40th GT has it in the correct range, i heard it was 13 ft. lbs.to be exact, and do it while the motor is cold. be sure to re-torque them soon after.

 

[kirkyg]

Just wanted to ask a related question. I'm changing my sparkies today and the first one I pulled out wasn't too bad except the fact that it has a small amount of oil deposit on the base of the plug. What does this usually mean? Could it be the PCV value or something? I would be surprised if it was some sort of seal leaking on my engine at 81k miles. Thanks,

Kirk