NGK ILKR7J8 Spark Plugs
End of the saga that started on Halloween, as I began looking for spark plugs between Oct 31st and Nov 1st while on holiday in Normandy. With a tow truck involved on Feb 16th due to fouled new Denso plugs installed just the day before.
I finally opted to buy from JDM specialist Nengun Performance, direct from Japan.
The order was placed on Feb 21st, the package dispatched on Feb 28th and delivered to me on March 10th. As detailed previously, the set of 6 spark plugs cost me roughly the same as a set of 3 from the local Suzuki dealer.
With the car having just reached 28 000 km, it was reasonable enough to proceed with the replacement without delay. The original plugs were showing their mileage, mostly on the ground electrode.
Use of a telescopic magnet is advised to lower the plugs in their openings. Both spark plugs and coils were torqued to their specified rates.
Now a full month and 1500km later, all I can say is that they just work, the fouling had nothing to do with my engine or engine management. Take this last sentence with the caveat that I cannot totally rule out an early effect of a mis-behaved new wideband oxygen sensor that had to be replaced mid-April.
UPDATE early May 2025 : Caterham Parts now lists 170 spark plugs as a 'new' item, they show ILKR on the picture, a good start.
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