I have a MK6 GTI and I replaced the Spark Plugs using the NGK recommended ones from Rock Auto and they were the OEM replacements.
I have the projected NGKs and they work great.
I run these on my stage 2 2019. Runs great. Like zero knock. Sometimes idle seems a bit less smooth when engine really hot but tach holds dead steady. Ran a set for 5k, inspected and put back in for another 5k then replaced with a fresh set and have another 2k on the new set.
I use NGK... it's the same 1/16 turn instructions on my Suzuki outboard (also NGK) and I use the same method of 1/4 -1/2 turn. Been good with those over 6 or 7 changes.
I was told that the Motorcraft iridium's are made by NGK?
I opted for the NGK DIFR6D13, since these were suggested by a local Honda dealership. These seem to be perfectly fine for the CR-Z. No complaints at all.
I've been running the NGK "rs7" plugs 06K905601M in my wagon since I went IS20 with an APR stage 3 91 tune. Stock gap out of the box was .026. I've now put about 6k on them and have had zero issues.
I have NGK ruthenium’s and it is noticeably smoother at idle vs iridium’s. Literally zero idle “pop” or misfires
That’s curious….. if you look closely at the end of the shorter plug you can see another set of threads, it looks like there an insert threaded onto that spark plug. It would appear that it wouldn’t be sitting where it needs to in the combustion chamber so that may explain your misfire.
after putting the new ones i changed all the spark plugs too, to fit them properly with new wires. but the car runned roughly, so bad..and when mechanic unscrew the new spark plugs to see, they were carbonized black, with just a ride around.
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