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  1. Engine and Technical Discussion
    Hey all, So I changed spark plugs on my Optima 2013 Turbo. I used the NGK 1422, and I can definitely notice a pretty big improvement on both throttle response and Fuel Economy. Heck, my idling RPM went down to 800-1000 RPM (from 1200 or so). Anyway, this was my first time changing spark plugs...
  2. Engine and Technical Discussion
    Hey guys, I was at the dealer earlier and I had a very good experience and conversation with the folks there. Apparently, the new OEM spark plugs are a lot better than before. The tech even showed me. It looks just like my HKS. Can someone confirm if the new OEM plugs are a lot better now or...
  3. Engine and Technical Discussion
    Before anyone says "search" ....I have. I live in montreal which we get very cold winters. I'm looking to change my plugs but not sure what to go with? HKS or NGK 1422. Car is none stock for the time being. Planning on adding down pipe and lap3 tune. Dealer sells stock plugs for 225$ which is nuts.
  4. New Member Introductions
    I own a 2013 Kia Optima with 96000 mile on it and will be changing the spark plugs for the first time on it. Any suggestions on what brand and possibly where I should get them?
  5. 3rd Generation Optima (2011 - 2015)
    Owners manual for this info is of course, useless, as designed. I am finding several different spark plugs on auto zone etc, all with different gaps. Searching here is also returning threads where folks have been tuning their gap / buying different brands.I just want the stock info so I can...
  6. 3rd Generation Optima (2011 - 2015)
    Hi guys Ive owned 12 optima 2.4 turbo l need to change spark plugs Denso 3478, 3479 or NGK 1422? which one is fit for me? Thanks
  7. Engine and Technical Discussion
    Hi, Could someone tell me what the spark plug gap is for a 2014 Optima EX 2.4? Thanks!
  8. The Service Center
    So I've been trying for a few days to source some new plugs for my 2014 SX turbo, and the only place I can find a set is a Kia dealer who needs to special-order them in at $48 PER PLUG. No thanks, especially since they won't lube it up first! :lipsrsealed: I've found that NGK's website(s) do...
  9. 4th Generation Optima (2016 - 2020)
    I wanted to take advantage of the K5 store 4th sale. I want to know what spark plugs comes standard on a 16 SX? Would the 1422 plug be an upgrade for my car?
  10. Engine and Technical Discussion
    I have about 13k miles on these plugs. They are the new ngk plugs that kia switched to a year or so ago. The car has been running great with these plugs for over a year until I started it this morning. i immediately noticed a rough idle and then saw the cel come on. After pulling the plugs, i...
  11. 3rd Generation Optima (2011 - 2015)
    Hello guys. I purchased the HKS spark plugs to get Lap 3 Chip installed and it is causing a problem. A week and a half ago, I installed the spark plugs(gapped to 0.028) along with Lap3 chip(91 octane chip set, 93 fueled). The car was driving fine for a week, so I decided to try chip set to 93...
  12. 3rd Generation Optima (2011 - 2015)
    Good evening optima owners! I have a question about HKS Spark plugs for the lap3 chip tune, and I need some help! I currently got the lap3 chip installed with stock HKS spark plugs from k5 optima store and the OCC. The issue that I currently have is low MPG (around 17~19) and it was once at this...
  13. Engine and Technical Discussion
    I have a spark knock: 2013 LX I switched from regular fuel to mid-grade Kia service said the knock was "normal" for a GDI engine The knock happens on acceleration, the RPM isn't high so these are more short acceleration bursts My question: I switched back to regular fuel when it started to...
  14. New Member Introductions
    Back in October I got a 2013 Kia Optima SX Turbo. The past 2+ months have been great and I'm glad I went with this vehicle. Today I just dinged 40K miles and I figured I'd go ahead and change the plugs while I had the time. I went to Kia and got a set. The 4 plugs they gave me were not the...
  15. Engine and Technical Discussion
    so as the title says, any recommendation for sparks for 2.4L? I've hit 76k and want to get a replacement without braking the bank please lol. I'm looking to replace OEM, i dont have any tune or performance mods.... Just looking for maintenance work, with a slight performance boost would be...
  16. Engine and Technical Discussion
    Ok so when I have thought of great spark plugs hks has never crossed my mind. Sure the make good parts but spark plugs?!?!? So the question comes into this. I live in Chicago and my last car was a 2003 mazdaspeed protege, it was basically a na 2.0 mazda stuffed a turbo kit on. That motor had...
  17. Engine and Technical Discussion
    Product Noob and was looking for clear instruction on an install for both products! Spark plugs are gonna need to be changed soon so...
  18. Engine and Technical Discussion
    Just installed my lap3 tune this weekend and I pulled the stock plugs which had 15000 miles on them only running 93 they looked like this, has anyone checked there spark plugs
  19. The Service Center
    Are there any alternatives for a 2013 non turbo lx 2.4l GDI to the denso 3478 plug? Would the NGK 3478 nickel work? Or? Any help appreciated.
1-19 of 50 Results