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#4717074 - 04/05/18 10:16 AM Spark Plug Gap weirdness
Urshurak776 Offline


Registered: 08/21/12
Posts: 447
Loc: North Carolina
Hi all. Looking to replace the plugs in My 2014 Kia Rio. I was looking at the plugs on Rock Auto. All the iridium plugs (Denso, NGK, Champion, Autolite, etc.) have different spark plug gaps. Anywhere from .032 to .044. I was thinking of going with the autolites as there is an active rebate. They say .044 gap. Why aren't they all the same?
_________________________
2012 Hyundai Santa Fe, 130,000 miles, Havoline Pro DS Full Syn 5W-20, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter

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#4717094 - 04/05/18 10:38 AM Re: Spark Plug Gap weirdness [Re: Urshurak776]
zrxkawboy Offline


Registered: 11/30/04
Posts: 1770
Loc: SD
Your underhood sticker should list the gap. I'd go with that.
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#4717111 - 04/05/18 11:02 AM Re: Spark Plug Gap weirdness [Re: Urshurak776]
Chris142 Online   content


Registered: 06/05/03
Posts: 16965
Loc: Deplorable in apple valley, ca
I would not put Autolites in that car. NGk or Denso.
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#4717121 - 04/05/18 11:07 AM Re: Spark Plug Gap weirdness [Re: Urshurak776]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1476
Loc: Ontario, Canada
Originally Posted By: Urshurak776
Hi all. Looking to replace the plugs in My 2014 Kia Rio. I was looking at the plugs on Rock Auto. All the iridium plugs (Denso, NGK, Champion, Autolite, etc.) have different spark plug gaps. Anywhere from .032 to .044. I was thinking of going with the autolites as there is an active rebate. They say .044 gap. Why aren't they all the same?


Because they are just generic plugs, not specifically for your vehicle. Use what is listed under your hood, or in the owners manual. Many Iridium plugs can not be gapped though.
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Mighty Mouse Tech
BMW Tech, Former Acura Tech
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#4717133 - 04/05/18 11:16 AM Re: Spark Plug Gap weirdness [Re: Chris142]
john_pifer Online   content


Registered: 07/08/12
Posts: 2030
Loc: Nashville, TN via Memphis
Originally Posted By: Chris142
I would not put Autolites in that car. NGk or Denso.


Uh, why not?
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#4717174 - 04/05/18 11:52 AM Re: Spark Plug Gap weirdness [Re: Urshurak776]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4324
Loc: North Carolina
Most fine-wire iridium plugs have a .40 or .44 gap if the factory gap is lower and the factory plug was copper/nickel/platinum.

The finer electrode of the iridium VS factory means you can run a higher gap with no ill effects. Iridium doesn't really erode either, so you don't need a smaller, less optimal starting gap to account for service life.
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#4717216 - 04/05/18 12:49 PM Re: Spark Plug Gap weirdness [Re: Urshurak776]
Urshurak776 Offline


Registered: 08/21/12
Posts: 447
Loc: North Carolina
Thanks for the reply guys. Looks like no matter what I buy, stick with the gap listed under the hood. I'll have to see what that is for my car. I "think" my car comes with NGK's but not sure. My wife's Hyundai came with Denso.
_________________________
2012 Hyundai Santa Fe, 130,000 miles, Havoline Pro DS Full Syn 5W-20, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter

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#4717223 - 04/05/18 12:58 PM Re: Spark Plug Gap weirdness [Re: Urshurak776]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6374
Loc: USA
Get the NGK. It's the actual OE spark plugs smile

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#4717278 - 04/05/18 02:26 PM Re: Spark Plug Gap weirdness [Re: Urshurak776]
Jooksing Offline


Registered: 03/05/18
Posts: 216
Loc: Chicago
I thought this is weird too. in the early 2000's I put Iridium in my 96 civic. The guy at the autoparts store assured me they are pre-gapped/do not gap them... and that I am good to go. after two distributors failed I took them out .. stuck with the OEM brand and gap size since for safe measure.

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#4717438 - 04/05/18 05:42 PM Re: Spark Plug Gap weirdness [Re: rooflessVW]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Gap to vehicle spec, not what the plug says it is gapped to.

Originally Posted By: rooflessVW
The finer electrode of the iridium VS factory means you can run a higher gap with no ill effects.


+100
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#4717517 - 04/05/18 06:56 PM Re: Spark Plug Gap weirdness [Re: Urshurak776]
Eddie Offline


Registered: 12/07/03
Posts: 9652
Loc: Florida, Cape Coral
I'd put in the same as the factory used be it NGK or whatever. The manufactures spend thousands of hours testing their engines and I don't want to try to outguess them. Life is too short. Ed
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#4717662 - 04/05/18 08:43 PM Re: Spark Plug Gap weirdness [Re: Urshurak776]
JeffKeryk Offline


Registered: 01/09/10
Posts: 320
Loc: Los Gatos, CA
Factory plugs are your safest bet. Our 2006 TSX came from the factory with 2 Densos and 2 NGKs.
I am so confused.
So I use 2 of each; in the proper cylinder, to this day.
Just sayin...

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#4718036 - 04/06/18 07:51 AM Re: Spark Plug Gap weirdness [Re: Urshurak776]
Errtt Offline


Registered: 11/14/10
Posts: 2808
Loc: California
I recently replaced the plugs (and coil packs) on my daily driver.
Removed Denso TT (Twin Tip - each plug has two iridium tips) and installed NGK Iridium.
So far so good, but I'll probably pull the NGK's around 40-50k on them (unless something happens sooner) and at least take a eyeball peek on them.

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#4718236 - 04/06/18 11:22 AM Re: Spark Plug Gap weirdness [Re: Urshurak776]
Urshurak776 Offline


Registered: 08/21/12
Posts: 447
Loc: North Carolina
Rock auto has both the NGK and Denso for my car. Iíll just grab a set of one of them and gap per my owners manual. Thanks everyone.
_________________________
2012 Hyundai Santa Fe, 130,000 miles, Havoline Pro DS Full Syn 5W-20, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter

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