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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: 458
North Carolina
Urshurak776 Offline OP
Urshurak776  Offline OP

Joined: Aug 2012
Posts: 458
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, 138,000 miles, Havoline Pro DS Full Syn 5W-30, WIX 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: 1,917
SD
zrxkawboy Offline
zrxkawboy  Offline

Joined: Nov 2004
Posts: 1,917
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: 18,411
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,411
Deplorable in apple valley, ca
I would not put Autolites in that car. NGk or Denso.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
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Re: Spark Plug Gap weirdness [Re: Urshurak776] #4717121
04/05/18 11:07 AM
04/05/18 11:07 AM
Joined: Apr 2017
Posts: 1,520
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline

Joined: Apr 2017
Posts: 1,520
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: 2,365
Nashville, TN via Memphis
john_pifer Offline
john_pifer  Offline

Joined: Jul 2012
Posts: 2,365
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, 208K
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: 5,650
North Carolina
rooflessVW Online content
rooflessVW  Online Content

Joined: Dec 2011
Posts: 5,650
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: 458
North Carolina
Urshurak776 Offline OP
Urshurak776  Offline OP

Joined: Aug 2012
Posts: 458
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, 138,000 miles, Havoline Pro DS Full Syn 5W-30, WIX 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: 7,893
USA
slacktide_bitog Online content
slacktide_bitog  Online Content

Joined: Mar 2008
Posts: 7,893
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: 225
Chicago
Jooksing Offline
Jooksing  Offline

Joined: Mar 2018
Posts: 225
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: 8,006
Waco, TX
Linctex Online content
Linctex  Online Content

Joined: Dec 2016
Posts: 8,006
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: 10,083
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,083
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: 1,167
Los Gatos, CA
JeffKeryk Offline
JeffKeryk  Offline

Joined: Jan 2010
Posts: 1,167
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...


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Spark Plug Gap weirdness [Re: Urshurak776] #4718036
04/06/18 07:51 AM
04/06/18 07:51 AM
Joined: Nov 2010
Posts: 2,845
California
Errtt Offline
Errtt  Offline

Joined: Nov 2010
Posts: 2,845
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: 458
North Carolina
Urshurak776 Offline OP
Urshurak776  Offline OP

Joined: Aug 2012
Posts: 458
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, 138,000 miles, Havoline Pro DS Full Syn 5W-30, WIX Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter.
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