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Re: Spark Plugs [Re: mez] #5279005 11/27/19 03:50 PM
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Kira Offline
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Here's my twist on the "old plugs" issue.

I got a 15 year old Ranger with the 4.0. Not 50K yet but 15 YEARS!

Should I replace mine? I got Motorcraft plugs from RA.

I plan to dose it with Kroil for a week before doing anything.

Re: Spark Plugs [Re: Kira] #5279040 11/27/19 04:18 PM
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atikovi Offline
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Originally Posted by Kira

I got a 15 year old Ranger with the 4.0. Not 50K yet but 15 YEARS!

Should I replace mine?


Did they come with platinum plugs? Not sure? Pull one and check. If yes and they look good and you have no driveability problems, I would pull them all to put anti-seize on the threads and put them back in. Maybe check and adjust gaps. But if you already bought new ones, takes the same time to put those in.

Re: Spark Plugs [Re: Propflux01] #5279061 11/27/19 04:42 PM
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ARCOgraphite Offline
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Originally Posted by Propflux01
At 178K, Those plugs are done, no matter how well you think it runs. You are also straining the coils jumping that gap that has more than likely increased quite a bit. Go RA or someplace legit, spend the $50 bucks and just do it right.You will notice the improvement.

Agreed.
I want to moderate my previous comment. They should have been pulled at 7 years 100K max with Iridium-Rhodium tips. so its really hard to tell a guy " Go ahead and get after it" at this stage at 13 years and 170K+ miles. '

This may end up being more of a challenge for a shade-tree than he anticipates with toasted on secondary insulators and welded in plug nut threads. The spark has to get from the coil to the plug - old insulators don't like to be moved around much before they develop a HV "leak:

But Maybe he will have some good luck smile

p.s: Autolite XP Ir can be had for a decent price most anywhere. I'm going to try some in the Subaru where they require a 60K changeout of Ir plugs (!!) Beware Tons of Chinese counterfeits out there everywhere.

Last edited by ARCOgraphite; 11/27/19 04:43 PM.

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: Spark Plugs [Re: mez] #5279109 11/27/19 05:38 PM
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pitzel Offline
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While the plugs should be replaced, the idea that they can last more than 110k isn't too far fetched on the K24. I threw a brand new set at mine, NGK's, and the 'wear' was only minimal relative to the ones I removed.

My older GM (3.1 V6) ran platinums out to 100k miles or so, successfully, but has a 'waste spark' system (ie: only 3 coils), which should, in theory, halve the life of the plugs. An engine without such system, such as the Hondas with the individual coil-on-plugs, should be able to achieve twice the life from the plug.


Change your thinking...not your oil!
Turn your mind....not your rotors!
Re: Spark Plugs [Re: mez] #5279159 11/27/19 06:26 PM
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benjy Offline
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girlfriends 08 vw 1.8T 50 thou on it running great. new plugs + 3 more mpg calculated, long intervals are for sales, not better performance!!

Re: Spark Plugs [Re: benjy] #5279278 11/27/19 09:01 PM
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reddevil Offline
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You need to understand how the Chinese manufacturing works. Everything is about volume.
Nike may get a chinese factory to make 100K pairs of shoes (just one model). The Factory will not make exactly 100K pairs, they will make 105K pairs. The extra 5K pairs will have many takers in the local market.
Each pair may cost the factory $5 and sold to Nike for $8 (which is over 60% markup) which NIke sells for $$$. So these extra pairs sold to local buyers for $10 which then get sold on Aliexpress or Ebay for $20 including free shipping across the world, which is still way cheaper than a NIke store.
Are these genuine product? of course they are.

Would the chinese local buyer buy a fake product for slightly less e.g. $8? The fake factory do not have the automation to churn out the volume required, so their raw materials are more expensive, requires more manual work, so they can only ask for smaller margin.
The factory producing genuine goods cost them little to churn out the extra 5K. So local buyers too, know that they need to sell genuine product overseas if they were to make good money.

I have visited factories in China and their production cost is low mainly due to automation and volume. The equipment they used are made overseas - Japan/German etc. Although labour cost is still cheap but it is no longer the driving force on cost. it is automation and volume. But buying from ebay and not holding the goods in your hand before purchase do pose a problem.

Of course the biggest buyer of Chinese goods is USA. With Trump tariff, it affected the volume but local automotive volume is still huge. The Chinese companies still sell the same price to USA. But USA importer get slapped a tariff by Uncle Sam. If importer raise the price to consumer, the goods price differential becomes less and therefore less attractive.

How do the Chinese government deal with this? They lower the RMB exchange rate.


Chinese still sells for X RMB . US importer used to pay $8 before tariff but with tariff, it is now $10. Once RMB is devalued, the importer pays $8.50 including the tariff. Good for importer, USA consumer and Uncle Sam.
That is why Trump call them currency manipulator.

Won't the lower currency affects the raw materials since China need to import them from overseas? in theory yes but in practise no, the currency of the rest of the world fell against the USD.
China still buy them at more or less the same price. They will just have less billionaire per year due to the trade-war uncertainty.

Re: Spark Plugs [Re: mez] #5279451 11/28/19 06:23 AM
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Egg_Head Offline
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"Know your jeweler"


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Re: Spark Plugs [Re: mez] #5279584 11/28/19 09:19 AM
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bulwnkl Offline
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I addressed the spark plug cost question for my Ridgeline by buying Autolite Iridium XPs from my local auto parts store. They work flawlessly, and didn’t cost the absurd amount that NGK & Honda want for their plug.


I use speech recognition frequently. Please excuse any consequent grammatical or typographical errors.
Re: Spark Plugs [Re: bulwnkl] #5280578 11/29/19 05:01 PM
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ARCOgraphite Offline
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Originally Posted by bulwnkl
I addressed the spark plug cost question for my Ridgeline by buying Autolite Iridium XPs from my local auto parts store. They work flawlessly, and didn’t cost the absurd amount that NGK & Honda want for their plug.

I think I will do the same for my wife's subaru. Used to run Inconel #63 copper core Autolites in Mitsubishi engines and they had a good heat range and good insulator heat sinking. Ran great. 30 years ago 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
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