Hey everybody, heard from the engineer at E3 plugs.He said the misfire I was experiencing was due to the hot E3.54 plug that was sold to me.He said the E3.53 was the correct plug for this application.Anyone know what E3 part numbers they have been running?

 

I wouldn't run those things in my lawn mower. Get some Autolite 5143 Copper Core and call it good. Just my 2¢

 

The general consensus is that the E3 plugs are no good at all. I have also heard that the plain old stock Autolite 5143's are as good as anything else.

 

+1, been running 5143's for ahwile now!

 

My car has super low milage on it (3 years old, 17K miles on it). But I'm getting ready to replace the plugs and will be using the 5143"s.