Hello, I just purchased a 1993 XJS 4.0 6 cylinder. My first project is changing out the spark plugs. Can someone tell me the gaping the plugs need to have and the best spark plugs to get for it. Thanks for the help and looking forward to y’alls input.

 

I like NGK plugs, gap is usually 0.035", but it should be specified on the emission decal under the hood. Depending on where you are, rockauto.com is usually the cheapest place to buy them.

 

Thanks, I’ve been reading .025 for the spacing but that was for V12 only I assume?

 

Yes, 0.025" is for a V12.

 

I went the whole hog and bought OEMl old stock copper core Champions from the UK - cheap shipping and priced well within affordability range. Unnecessary of course, but what else is there to spend money on these days?

Larry