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Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: RDY4WAR] #5076681 04/16/19 10:26 AM
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Rhymingmechanic Offline
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Originally Posted by RDY4WAR
That's quite an impressive gap.

My 2002 Tahoe 5.3L called for .060" gap originally but was later changed to recommend .040". I ran two sets of TR55 plugs, one set at .040" and the second at .060", and didn't notice any cold start, hesitation, response, mpg, nor power difference.


Do you remember if that new gap was for the factory platinum plugs, or did it come along with the recommendation for iridiums? I changed my 2001 5.3 to iridiums in about 2007, and their gap spec was .040.

Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: Superflan] #5076747 04/16/19 11:48 AM
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I regapped a set of Denso Platinum TTs to .035" per Subaru spec for a friend's car even though Denso says don't gap them as they are preset to .040" or 1mm. I should have left it alone although it did work. On a previous car, I had 160K on the OEM Denso PK20R-11 plugs that were indexed by Toyota(they were stamped with an A on the terminal end).

The other day ago, I had to look at a Kohler engine on a old Cushman greens rotocutter for dethatching lawn bowling/crochet greens. The previous club members installed a ACDelco R43LTS plug for a SBC when Kohler doesn't use tapered seat plugs(OEM is a Champion RC12YC). Installed a Denso K16PR-U11 and it now starts within 3 pulls. Before, it wouldn't fire until starting fluid was used.

Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: Rhymingmechanic] #5076837 04/16/19 01:38 PM
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RDY4WAR Offline
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Originally Posted by Rhymingmechanic
Originally Posted by RDY4WAR
That's quite an impressive gap.

My 2002 Tahoe 5.3L called for .060" gap originally but was later changed to recommend .040". I ran two sets of TR55 plugs, one set at .040" and the second at .060", and didn't notice any cold start, hesitation, response, mpg, nor power difference.


Do you remember if that new gap was for the factory platinum plugs, or did it come along with the recommendation for iridiums? I changed my 2001 5.3 to iridiums in about 2007, and their gap spec was .040.


I can't remember, but I assume so. The OEM manual in the glovebox says .060", but when I look it up online it says "Updated .040". I'm guessing they may have been having misfire or ignition issues/failures from the wider gap. I just run them at .040" now since that's close to what they are out of the box.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: Superflan] #5076958 04/16/19 03:32 PM
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pandus13 Offline
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Mwahahahaha,

Those looks nothing like the ones I pull from my SIL's '99 Toyota Celica.
They didn't have the little point anymore... all 4 of them. (beside being all black+rusty)

She was like, "what did you do to the car?", it works now....


16 Golf SportWagen
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95 accent
95 mystique
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Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: Superflan] #5076968 04/16/19 03:45 PM
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NGRhodes Offline
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From my old Corolla, old plugs were causing no issues:

[Linked Image]

Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: walterjay] #5076982 04/16/19 04:02 PM
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Propflux01 Offline
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Originally Posted by walterjay
We have a Hyundai SantaFe with 165,000 miles on the original iridium plugs. Runs perfect. I can only imagine the gap on those.


Pull one. You will be surprised at how big of a gap you now have. Plugs are cheap. Coils, not so much.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: Superflan] #5077146 04/16/19 06:53 PM
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JustinH Offline
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I agree, I just wanted for Rockauto to have a deal, and combined that with an Autolite rebate for Iridium plugs for my Sonata. Been running great. Replaced at about 65k.


'16 Ford Escape
'11 Scion XB
Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: Superflan] #5077177 04/16/19 07:21 PM
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The bad about coil on plug (at least on my old Mercedes M272 V6) is them being able to adapt so well to widening gap is that it will run just fine up until the last minute then leave you with needing new plugs ASAP.

My C300 had 80k change intervals and I was closing in on 85k, I was between services so figure it could wait until my next oil change that was about 2 months down the road (prior oil change was ~78k miles). Car was running just fine but pretty much overnight went from starting fine while cold to misfiring horrifically for the first 10-15 seconds of every cold start, after about 4-5 days of this it finally triggered the CEL with misfire codes on 5 of the 6 cylinders. New plugs and everything went back to normal, I got my old plugs back and there was pretty much no electrode left. Never any perceptible misfires while driving, just the cold start issues.


2012 Volkswagen Jetta Sportwagen TDI - 69k - Castrol Edge Professional LL03 5W30
2011 Volkswagen Jetta Sportwagen TDI - 49k - Castrol Edge Professional LL03 5W30
Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: walterjay] #5081226 04/20/19 09:03 PM
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hallstevenson Offline
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Originally Posted by walterjay
We have a Hyundai SantaFe with 165,000 miles on the original iridium plugs. Runs perfect. I can only imagine the gap on those.

Just changed the plugs on my G35 with 121k miles. These were the factory plugs too. 5 of the plugs were gapped at 0.040" and 1 was at 0.045". The spec gap is 0.040".

Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: pezzy669] #5081341 04/20/19 11:06 PM
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The Critic Online Crying
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Originally Posted by pezzy669
The bad about coil on plug (at least on my old Mercedes M272 V6) is them being able to adapt so well to widening gap is that it will run just fine up until the last minute then leave you with needing new plugs ASAP.

My C300 had 80k change intervals and I was closing in on 85k, I was between services so figure it could wait until my next oil change that was about 2 months down the road (prior oil change was ~78k miles). Car was running just fine but pretty much overnight went from starting fine while cold to misfiring horrifically for the first 10-15 seconds of every cold start, after about 4-5 days of this it finally triggered the CEL with misfire codes on 5 of the 6 cylinders. New plugs and everything went back to normal, I got my old plugs back and there was pretty much no electrode left. Never any perceptible misfires while driving, just the cold start issues.

The 272 should have plugs done at 60K intervals. The last one I did showed plugs as part of the 60K service in the manual.


2011 Toyota Prius 1.8L - 202K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 143K - Valvoline Premium Blue Restore 10W-30
Re: THAT Spark plug gap was still running the engine mostly fine ! [Re: walterjay] #5081475 04/21/19 07:24 AM
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Patman Offline
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Originally Posted by walterjay
We have a Hyundai SantaFe with 165,000 miles on the original iridium plugs. Runs perfect. I can only imagine the gap on those.


Iridium plugs can go a lot longer than people think. There is a guy on the 8th gen Civic forum who has over a million miles on his Civic and he has close to that amount of mileage on his iridium plugs. He pulls them out every once in a while to check them and clean them and puts them back in since they are still going strong. I foolishly changed my original iridium plugs in my Civic at 80k, long before they needed replacing, and went with lesser quality iridiums from Champion. A few years later I bought another set of OEM iridiums (which are NGK laser iridiums) and will never need to change them again (I only drive 5k a year on this car)


2018 Corvette, 17k, M1 ESP Formula 5w30 & NAPA Gold
2006 Civic EX Coupe, 154k, PUP 5w20 & Fram Ultra
2010 BMW 328i X-Drive,125k, GC 0w40 & Fram Ultra

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