Just replaced spark plugs at 50000 miles two weeks ago.used naked plugs that I got from Napa now the engine is developing misfires.Pulled them from engine they all had a lot of carbon on them a lot more than the ones that had 50000 miles on them those were pretty clean. All the parts stores list the same part number . it has the same number as listed on ngks web site parts finder.i am guessing that they are to cold was going to try denesco but they do not list one for the car.Was wondering what could be wrong and what other plug that I could try thanks for any information anyone could provide thanks joe
2022 Honda civic spark plugs
- Thread starter patfan
- Start date
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- Feb 6, 2025
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Is it possible you got 1.5L Turbo plugs for your 2.0L ?
Because the 1.5L Turbo lists a .030" gap and the 2.0L lists a .044" gap.
Because the 1.5L Turbo lists a .030" gap and the 2.0L lists a .044" gap.
Did the maintenance minder come on, calling for changing the plugs? I thought that most modern cars would have longer change intervals than that?
As grasscutter said a really different gap can cause that. In general but not always a higher compression ratio and forced induction increase cylinder pressure and usually require a tighter gap but other things can change the factors that dictate what the designers decide for the plug gap as well like afr and the bore stroke cam profile duration valve quantity and size the currents that go in and out of the chamber, ignition, vvt. and afr software and likely more things still. The heat range figure annoyingly differs between brands but a slight difference in heat range shouldn't be a big deal though some cars can be very sensitive to different than oe plugs some not. My old trucks aren't picky.
the plugs were the ones for the 1.5 gapped at .30
they have a heavy coat of carbon on them more than i have seen on plugs that have twice that mileage on them also every drop of gas has been mobil super unleaded
What number was actually on the plugs that came out? Often the OEM's just have the actual Denso / NGK number.
they went to the trash i didn't look at the parts number on oems but ngk's website listed the same part number that i put in
I had some NGK's new from RA that I am still confused about. I had a misfire on one at about 5K miles. Replaced it and the coil (was on kids car 2 hours away, didn't want more problems.
A couple weeks later had a different one go. Swapped same thing there.
Could have been the coils. The coils were quite old. But still - what are the odds? I think it may have been bad plugs but I didn't trouble shoot enough to say for sure.
A couple weeks later had a different one go. Swapped same thing there.
Could have been the coils. The coils were quite old. But still - what are the odds? I think it may have been bad plugs but I didn't trouble shoot enough to say for sure.
Why did you need new plugs at 50k? 
What are your driving conditions? A lot of stop and go short trips?
You should also consider using 5w30 oil in addition to filling with premium. The only plugs that seem to be available for your Civic turbo are iridium NGK and Bosch.
What are your driving conditions? A lot of stop and go short trips?
You should also consider using 5w30 oil in addition to filling with premium. The only plugs that seem to be available for your Civic turbo are iridium NGK and Bosch.
What is the part # of the plugs? Do you have a way to check misfires in real time, ie; datalogging through diagnostics port?
If the engine calls for Iridiums, I too am curious as to why you replaced them at 50K. Iridiums last much longer than that. Depending on driving conditions, their good for 100-150K, if not more. Too bad you threw out the originals, I would have just cleaned them up a bit and re-installed them. Then go back to the store and try to get a refund on the ones they sold you.
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VW calls for plug replacement at 40,000 mile intervals.
at first at ran perfectly after a week started stumbling right after startup now it slightly misfires on occasion no lights on dash they have been in only 2-3 weeks no more than 600 miles on them. If i am not able to get ngk would autolight or bosch be better
i change them because i thought a turbo might be harder on them
Please use punctuation and capital letters in your posts. It makes it easier for us to read and provide assistance. Otherwise, I have to assume you’re no older than three or four. And, I should probably not help a four year old get their car on the road.
Buy some OEM plugs, or get your parents to order them for you. It may or may not fix it. But, if it was running ok with the “heavy coat of carbon” on the original plugs, maybe just pull and clean every 30k-50k miles.
Buy some OEM plugs, or get your parents to order them for you. It may or may not fix it. But, if it was running ok with the “heavy coat of carbon” on the original plugs, maybe just pull and clean every 30k-50k miles.
Patman
Staff member
OEM plugs are always the best choice for Honda engines. And they last a long time! Way longer than most people are comfortable leaving them in for. My Civic has the 2.0, so it’s a little easier on plugs but even still, I’m at 181,000 miles on my original plugs and still getting incredibly good MPG and the engine runs smoothly. Once either of those things changes then I’ll change the plugs.
