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post #1 of 6 (permalink) Old 11-28-04, 01:37 PM Thread Starter
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Spark plugs for 4.0L

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?


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post #2 of 6 (permalink) Old 11-28-04, 03:16 PM
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Re: Spark plugs for 4.0L

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
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post #3 of 6 (permalink) Old 11-28-04, 05:48 PM
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Re: Spark plugs for 4.0L

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.

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post #4 of 6 (permalink) Old 11-28-04, 06:48 PM
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Re: Spark plugs for 4.0L

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

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post #5 of 6 (permalink) Old 11-29-04, 01:49 AM
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Re: Spark plugs for 4.0L

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
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post #6 of 6 (permalink) Old 11-29-04, 04:19 AM
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Re: Spark plugs for 4.0L

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.
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