edv8wagon

Which spark plugs do most peolpe use in their EL 4.0L, the NGK specified for XR6, the NGK specified for "4.0L except XR6" , not sure what the difference is? or JMM's Autolite plugs? which ones are they anyway?

__________________
My tag line sucks, can I borrow yours?

johnydep

XR6 & LPG use a smaller gap
I have had good results with Denso plugs, which are also the genuine plug.

Standard - W16EXRU-11 this is 1.1mm
XR6 & LPG - W16EXRU this is .08mm

madmelon

Atm has ford plugs in it. used to have NGK's..they were pretty good till they all burned out...my fault, not plugs. Can widen the gap well past 1.1mm if you want to without hurting idle.

__________________
1987 Jaguar Sovereign - Metallic Green
3.6L DOHC 24 Valve
140KW@4750rpm
307Nm@3750rpm (Flywheel)

SiX_iN_a_RoW

In my EA i used the NGK XR6 plugs ( slightly cooler heatrange ) which gave better idle, havent noticed any difference between the standard and XR6 plugs on the EF though. All I can say is stay away from the Bosch plugs, ran like crap and didnt last long at all

__________________
Lets go find that Hotdog tree I planted

Lowered EF Futura
Black Steelies ( too cheap to buy proper mags )

smee

I was going to try the autolite 985 (like jmm) but i think they are going to be too hot plug - ngk equiv ZFR4F-11 or ZF4A11 - the 4 indicades hotter than standard = 5 XR6=6 (bigger number the cooler)

NGK XR6 = ZGR6B-11 @ 1.1mm

needturbo6

im using iridiums atm and until something else went wrong on my car, it definitly pulled a lot better though for 15 bucks each they oughta, plus u get 100,000 k's out of em.
a cheap mod that is effective is to grind/file the plugs' ground electrode down, ill post a thread on this sometime soon.