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Spark Plug Gap weirdness #4717074
04/05/18 10:16 AM
04/05/18 10:16 AM
Joined: Aug 2012
Posts: 447
North Carolina
Urshurak776 Offline OP
Urshurak776  Offline OP
Joined: Aug 2012
Posts: 447
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
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717094
04/05/18 10:38 AM
04/05/18 10:38 AM
Joined: Nov 2004
Posts: 1,803
SD
zrxkawboy Online content
zrxkawboy  Online Content
Joined: Nov 2004
Posts: 1,803
SD
Your underhood sticker should list the gap. I'd go with that.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717111
04/05/18 11:02 AM
04/05/18 11:02 AM
Joined: Jun 2003
Posts: 17,374
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,374
Deplorable in apple valley, ca
I would not put Autolites in that car. NGk or Denso.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717121
04/05/18 11:07 AM
04/05/18 11:07 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
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.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Spark Plug Gap weirdness [Re: Chris142] #4717133
04/05/18 11:16 AM
04/05/18 11:16 AM
Joined: Jul 2012
Posts: 2,103
Nashville, TN via Memphis
john_pifer Offline
john_pifer  Offline
Joined: Jul 2012
Posts: 2,103
Nashville, TN via Memphis
Originally Posted By: Chris142
I would not put Autolites in that car. NGk or Denso.


Uh, why not?


16 WRX - PPPP
07 Tacoma V6 - M1 EP 5W-30, Fram Ultra, 10K OCIs, 198K
07 Yamaha R1 - Rotella T6 5W-40, Bosch 3300
07 Yamaha YZ-250, Klotz, Rotella

Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717174
04/05/18 11:52 AM
04/05/18 11:52 AM
Joined: Dec 2011
Posts: 4,755
North Carolina
rooflessVW Online content
rooflessVW  Online Content
Joined: Dec 2011
Posts: 4,755
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.


"Zed's dead baby, Zed's dead."
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717216
04/05/18 12:49 PM
04/05/18 12:49 PM
Joined: Aug 2012
Posts: 447
North Carolina
Urshurak776 Offline OP
Urshurak776  Offline OP
Joined: Aug 2012
Posts: 447
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
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717223
04/05/18 12:58 PM
04/05/18 12:58 PM
Joined: Mar 2008
Posts: 6,837
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,837
USA
Get the NGK. It's the actual OE spark plugs smile

Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717278
04/05/18 02:26 PM
04/05/18 02:26 PM
Joined: Mar 2018
Posts: 216
Chicago
Jooksing Offline
Jooksing  Offline
Joined: Mar 2018
Posts: 216
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.

Re: Spark Plug Gap weirdness [Re: rooflessVW] #4717438
04/05/18 05:42 PM
04/05/18 05:42 PM
Joined: Dec 2016
Posts: 6,262
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,262
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


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717517
04/05/18 06:56 PM
04/05/18 06:56 PM
Joined: Dec 2003
Posts: 9,806
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,806
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


CX5 Touring 2.5L :-)
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717662
04/05/18 08:43 PM
04/05/18 08:43 PM
Joined: Jan 2010
Posts: 455
Los Gatos, CA
JeffKeryk Offline
JeffKeryk  Offline
Joined: Jan 2010
Posts: 455
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...

Re: Spark Plug Gap weirdness [Re: Urshurak776] #4718036
04/06/18 07:51 AM
04/06/18 07:51 AM
Joined: Nov 2010
Posts: 2,814
California
Errtt Offline
Errtt  Offline
Joined: Nov 2010
Posts: 2,814
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.

Re: Spark Plug Gap weirdness [Re: Urshurak776] #4718236
04/06/18 11:22 AM
04/06/18 11:22 AM
Joined: Aug 2012
Posts: 447
North Carolina
Urshurak776 Offline OP
Urshurak776  Offline OP
Joined: Aug 2012
Posts: 447
North Carolina
Rock auto has both the NGK and Denso for my car. I’ll 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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