
Originally Posted by
derpomz
I may have the wrong spark plugs.
I have read the RAVE on tuning and it keeps talking about up to 99MY and after 99MY.
Can somebody explain what this means. I have a first registered 96 P38A 4.6. What plugs should i suse,
Tha manual says Champion plugs, there are two types
RC11YCC and RC11PYB4, which plugs will suit my Rangie.
The plugs i used are Champion RC11YX, are these the wrong plugs.
No, not the "wrong" plugs
"Stay Calm -read the chart" 
https://www.championsparkplugs.com/l...mbering-system
under "Learning Center" click on Champion's Numbering System... the chart should show immediately ... it won't link direct
In your case,
The "R" means Resistor (to stop radio interference)
C means a 14mmm thread and a 5/8" hex(spanner size) and 3/4"reach into the combustion chamber
11 is the heat range... you can use either 11 or 12 in a 4.6
Y means a standard projected core "nose"
X is a fine wire ; PBY4 is platinum multiple ground electrode, 4 is the wide gap to meet Californian emission regs; YCC means standard nose, double copper (ground and centre electrode)
BTW ...where did you get the RC11YX plugs? there's very little reference to them on the Net... there's reference to RN11YX it's just the hex spanner size 5/8" vs 13/16"
MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
2020 Subaru Impreza S ('SWMBO's Express' )
2023 Ineos Grenadier Trialmaster (diesel)
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