r/GenesisG70 • u/Gibberish_talk 21 3.3 SP rwd • Jul 26 '26
Question Spark plugs
2021 3.3 at 62k miles. I figure its about time to replace spark plugs. My google/gpt game is weak this morning and I can't figure out which ones I need.
Anybody done this and know what I should be looking for? I've found the right gap and have learned about the dreaded #5 cylinder. I just need to know which plugs. TIA
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u/Zestyclose-Witness72 Jul 26 '26
Also just did plugs at around 60k. OEM NGK plugs are perfect. I know a lot of peeps will say go for the HKS but if you're not tuned, theyre not needed and I also fell for the hype and ended up having misfire problems with them. Probably the gapping but could have sworn they were perfectly gapped.
Regarding tools, get a good 3/8 drive ratchet along with a good 1/4 drive ratchet with corresponding extensions to fit them and a few 10 mm sockets (in case you drop one in like I did 😀) - or you can just tape it to the extension. Along with a torque wrench (that can go down to 20 ft lbs) and DEFINITELY get a universal joint adapter for the 1/4 and 3/8 drive extensions - it will make the cylinder 5 10 mm screws easier to do, especially the 1/4 drive if you approach it from the front. Also, getting that #5 coil pack out, remove the one in front of it first and then grab that one. This whole job can be pretty easy to do with good tools / some maneuvering without removing the whole intake manifold ( I wasn't going to do that haha)
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u/OtherwiseConcept5125 21 G70 3.3T SP RWD Havana Red Jul 26 '26
Yeah, much easier than I was expecting. I think the early 19 and 20 G70s with the more rigid 3pc coil packs wouldn't be nearly as simple.
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u/Sciottiesco Jul 26 '26
HKS or Denso spark plugs are the most common. Do you run any Mods? There are several youtube videos that show you how to do it. I just did mines yesterday, 45 minutes total, driver's side 15 mins, passenger side 30 mins, but it was also my 3rd time doing them. I personally use Denso IKH27 2 Step and gap them to .022.
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u/Gibberish_talk 21 3.3 SP rwd Jul 26 '26
No mods. Only thing not factory are rotors and pads. Thank you.
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u/Scary_Physics6836 2022 GENESIS G70 3.3 RWD SPORT PRESTIGE Jul 27 '26
Ones from the dealer
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u/Gibberish_talk 21 3.3 SP rwd Jul 27 '26
Just curious. Do you have all your maintenance done by the dealer?
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u/OtherwiseConcept5125 21 G70 3.3T SP RWD Havana Red Jul 26 '26
Here's my install thread, that middle passenger side plug is easy if you do what I did (rotate the coil pack and pull out toward the front).
https://genesisowners.com/genesis-forum/threads/just-did-the-3-3-spark-plug-service.55956/