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New plugs in 2012 Frontier #5289935 12/09/19 11:02 PM
Joined: Jun 2002
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MolaKule Offline OP
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I had the Spark plugs changed at 78,000 miles since the idle was getting a bit rough and fuel economy was dropping somewhat.

The plugs that were pulled looked good but two had slightly higher resistances than average.

None of them appeared overheated or had any deposits whatsoever.

New NGK Iridium's (LFR5AIX ) went in and now idle is very smooth.


Charlie Eppes: "What do you think we should do now?"
Don Eppes: "The same thing when I was in school and I didn't know the answer – fake it." From NUMB3RS
Re: New plugs in 2012 Frontier [Re: MolaKule] #5289938 12/09/19 11:11 PM
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Dave_Mark Offline
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Were there NGK Rutheniums available for your application?

Re: New plugs in 2012 Frontier [Re: Dave_Mark] #5289940 12/09/19 11:16 PM
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MolaKule Offline OP
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Originally Posted by Dave_Mark
Were there NGK Rutheniums available for your application?


I checked all four local parts stores and they could order them but it would be about a 3-5 day delivery.

However, I needed the plugs changed before I go a short trip this weekend (weather permitting frown )

Last edited by MolaKule; 12/09/19 11:18 PM.

Charlie Eppes: "What do you think we should do now?"
Don Eppes: "The same thing when I was in school and I didn't know the answer – fake it." From NUMB3RS
Re: New plugs in 2012 Frontier [Re: MolaKule] #5289946 12/09/19 11:33 PM
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Marco620 Offline
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Im installing NGK Ruthenium plugs this next oci. Im sure they are good for at least 50HP!


15' Civic 1.8 i-vtec 302,000 mi M1 AP 0w20 & LG Biotech, BP CVT Fluid,GUMOUT W/ PEA
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Re: New plugs in 2012 Frontier [Re: MolaKule] #5290036 12/10/19 06:01 AM
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Sierra048 Offline
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Is that the 4.0 V6. If so, how did you handle the passenger side plugs? Did you remove the air plenum to get to them?


2014 Nissan Frontier
2014 GMC Sierra 1500
Re: New plugs in 2012 Frontier [Re: MolaKule] #5290054 12/10/19 06:35 AM
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daves87rs Offline
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Cool.....


2019 Chevrolet Equinox LS
2006 Chevrolet Cobalt LS
Re: New plugs in 2012 Frontier [Re: MolaKule] #5290084 12/10/19 07:15 AM
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buster Offline
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thumbsup


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: New plugs in 2012 Frontier [Re: MolaKule] #5290114 12/10/19 07:37 AM
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ARCOgraphite Offline
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Sounds like the time for plug service.

The Impedance in the RF resistor doesn't matter much since its very high voltage and you are jumping a spark gap.
You do want read continuity there though as evidence the resistor didn't burn out.

Typically over time contaminants build up around the external insulators and they break down during high humidity and certain engine loads.

The spark doesn't really want to jump the gap if its easier to bridge across under the plug boot and crawl along the alumina insulator.

Glad to hear it ran better after the tune smile
.


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: New plugs in 2012 Frontier [Re: Marco620] #5290141 12/10/19 07:57 AM
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ARCOgraphite Offline
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Originally Posted by Marco620
Im installing NGK Ruthenium plugs this next oci. Im sure they are good for at least 50HP!


From what I've seen on plug changeout video on YouToob for the latest subaru FB20, they employ these plugs and I feel I'd be a dope if I change them out at 60K as Subaru advises. That's a junky old school Pt plug service interval.

So what do I do? I have one of those (joke?) lifetime engine warranties from the dealer,
that requires all service in the manual to be performed.

I guessing the ruthenium is alloyed with Pt to increase hardness and toughness of the Pt
thumbnail on the GND electrode on these plugs. This is likely where the increase ignitability comes from.

With more prevalent wideband Lambda control we may see leaner part-load mixtures than in recent past with simple feedback and mapping.


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: New plugs in 2012 Frontier [Re: MolaKule] #5290159 12/10/19 08:16 AM
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millerbl00 Offline
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I used the NGK Rutheniums in my 2015 Frontier. Good plugs!

Re: New plugs in 2012 Frontier [Re: MolaKule] #5290182 12/10/19 08:31 AM
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BAJA_05 Offline
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Those NGK Iridiums will take care of your Frontier for years down the road. Sleep well at nite. Glad to hear the idle smoothed out.


2017 VW Jetta SE TSI 1.4L Turbo (hers)
PP Euro 0W40 & FU (42K)
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2000 Ram 4X4 5.2L (93K) T6 MV 5W30 & FU
Re: New plugs in 2012 Frontier [Re: MolaKule] #5290208 12/10/19 08:50 AM
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JeffKeryk Offline
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What was the OEM plug? NGK or Denso perhaps?


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Re: New plugs in 2012 Frontier [Re: MolaKule] #5290303 12/10/19 11:04 AM
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paoester Offline
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Originally Posted by MolaKule
The plugs that were pulled looked good but two had slightly higher resistances than average.
What is the usual degradation mechanism? Is it center electrode micro-cracking due to vibration over time? What resistance do they have new, versus the highest allowed used?

Re: New plugs in 2012 Frontier [Re: MolaKule] #5290426 12/10/19 01:02 PM
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benjy Offline
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my 11 fronty 4.0 only has 36 thou on it but prolly change at 50 thou. girlfriends 08 1.8t passat got plugs at 50 thou and several more mpgs!

Re: New plugs in 2012 Frontier [Re: Sierra048] #5290968 12/10/19 10:58 PM
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MolaKule Offline OP
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Originally Posted by Sierra048
Is that the 4.0 V6. If so, how did you handle the passenger side plugs? Did you remove the air plenum to get to them?



Yes, the Plenum had to be removed. A 3.5 hour job in total.

Driver side plugs are a no brainer as the coil-overs are staring you right in the face/


Last edited by MolaKule; 12/10/19 11:29 PM.

Charlie Eppes: "What do you think we should do now?"
Don Eppes: "The same thing when I was in school and I didn't know the answer – fake it." From NUMB3RS
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