Chaps,
Did quite a lot of research on the plugs for the +4 (2004).
The correct plugs are motocraft Ford part number 1307093. (1S7J 12405 EB).
Alternative plugs are NGK PTR 6 F 13 or Champion Eon 3.
The gap is set to 1.3 but there is much talk on the Talk Ford site that this gap has been revised to 1.0.
It would seem that the 1.3 gap creates a very strong spark, but puts too much load on the HT leads and coil.
The reduced gap eases the load and lengthens the service of the coil & HT leads.
Apparently there is official acceptance of this variance by Ford but the plugs I got wear set to 1.3!
I got the correct titanium plugs from a Ford dealer at £52 for four, the NGK Packs at Halfords were £21 ish.
Expensive, but I am happy that te original spec is maintained.
+ new air filter and the car is so smoooooth!
All the best
Tony
