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Re: Are these spark plugs still good? [Re: Deontologist] #5153397 07/06/19 09:00 PM
Joined: May 2002
Posts: 1,527
TheLoneRanger Offline
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Posts: 1,527
Spark plugs have internal resistors that degrade over time. That's why a plug that looks good on the outside might be
firing very weakly when it's under compression. Most plugs have a resistance of about 5K-8K ohms that's easy to check
with a multimeter. If a plug tests substantially over the resistance of it's mates, then it's time for replacement...


Some days you eat the bear, some days the bear eats you.....
Re: Are these spark plugs still good? [Re: dailydriver] #5153694 07/07/19 09:49 AM
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Whimsey Offline
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Originally Posted by dailydriver
Originally Posted by Deontologist
Replaced all 6 with Rutheniums and noticed a huge difference. Idle became glass smooth. Fuel economy went up 1-2 MPG overall and that's with me stomping the pedal harder than ever. I was getting like 18 driving conservatively. After changing I was getting 19-20 and that's with a bunch of 0-60 sprints just to get a feel for the new plugs.


I just replaced my 18K mile (NGK made Motorcraft Iridiums shrug ) factory plugs with the same heat range Rutheniums as well.

The idle is MUCH smoother, but no long trips yet to check the fuel mileage, and I have not been able to drive it in 'anger' yet to see if there is any difference in that realm.


Just curious, how worn was the gap on the factory plugs @18,000 miles compared to installed recommended gap? My wife has a 2017 2.3 EB Explorer with ~45,000 miles. I'm going to change them soon with the same Motorcraft iridium plugs that I got from RA for ~$4.50/ea. Ford says they're 100,000 mile plugs. Currently it's smooth running and still gets the same or very similar mpg as after break in. But I have to guess that the DI Turbo in a smaller engine in a heavier vehicle takes it's toll on the plugs. I look at is a cheap preventative maintenance rather than failing on the road while she's driving. Thank goodness for inline 4 cylinder engines grin2.

Whimsey

Re: Are these spark plugs still good? [Re: hallstevenson] #5153712 07/07/19 10:18 AM
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NavyVet88 Offline
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Originally Posted by hallstevenson
Will you put the original plugs back in ? If not, it really doesn't matter.... What if the majority of folks say they look fine ?

When I replaced plugs in (2) of our cars recently, I kept the old plugs for a few weeks just in case we got a bad one with the new plugs. After that, I kept (2) plugs for each car as back-ups, just in case.

Originally Posted by hallstevenson
Will you put the original plugs back in ? If not, it really doesn't matter.... What if the majority of folks say they look fine ?

When I replaced plugs in (2) of our cars recently, I kept the old plugs for a few weeks just in case we got a bad one with the new plugs. After that, I kept (2) plugs for each car as back-ups, just in case.


I do this too. Especially seeing as the NGK platinum plugs for my civic are $24 a piece. Granted I don’t pay that and get them off rock auto for around $13 a piece.


2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Are these spark plugs still good? [Re: NavyVet88] #5153905 07/07/19 01:26 PM
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Deontologist Offline OP
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Why not get NGK Rutheniums? They're cheaper than iridium and Platinum, at least in my application.

Re: Are these spark plugs still good? [Re: Deontologist] #5153959 07/07/19 02:25 PM
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Posts: 7,229
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doitmyself Offline
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Originally Posted by Deontologist
100k miles in service. Manual calls for 60k change intervals. Spark plug itself is rated for 120k.

Replaced all 6 with Rutheniums and noticed a huge difference. Idle became glass smooth. Fuel economy went up 1-2 MPG overall and that's with me stomping the pedal harder than ever. I was getting like 18 driving conservatively. After changing I was getting 19-20 and that's with a bunch of 0-60 sprints just to get a feel for the new plugs.

Do you think that the Rutheniums actually improve performance vs. OEM plugs or are your differences due to comparing new plugs to old, maybe worn out plugs?

Re: Are these spark plugs still good? [Re: Whimsey] #5153985 07/07/19 02:44 PM
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dailydriver Offline
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Originally Posted by Whimsey
Originally Posted by dailydriver
Originally Posted by Deontologist
Replaced all 6 with Rutheniums and noticed a huge difference. Idle became glass smooth. Fuel economy went up 1-2 MPG overall and that's with me stomping the pedal harder than ever. I was getting like 18 driving conservatively. After changing I was getting 19-20 and that's with a bunch of 0-60 sprints just to get a feel for the new plugs.


I just replaced my 18K mile (NGK made Motorcraft Iridiums shrug ) factory plugs with the same heat range Rutheniums as well.

The idle is MUCH smoother, but no long trips yet to check the fuel mileage, and I have not been able to drive it in 'anger' yet to see if there is any difference in that realm.


Just curious, how worn was the gap on the factory plugs @18,000 miles compared to installed recommended gap? My wife has a 2017 2.3 EB Explorer with ~45,000 miles. I'm going to change them soon with the same Motorcraft iridium plugs that I got from RA for ~$4.50/ea. Ford says they're 100,000 mile plugs. Currently it's smooth running and still gets the same or very similar mpg as after break in. But I have to guess that the DI Turbo in a smaller engine in a heavier vehicle takes it's toll on the plugs. I look at is a cheap preventative maintenance rather than failing on the road while she's driving. Thank goodness for inline 4 cylinder engines grin2.

Whimsey



The factory plugs were at ~.032 gap (factory specs .028).

The reason for that, at that low mileage, may be the way I drive it (like a Hoonigan/WOT/much boost wink ), and possibly (shrug) also because I used an E30/93 blend for a while, when we still had an E85 dispensing station in the area.


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: Are these spark plugs still good? [Re: Deontologist] #5154670 07/08/19 11:43 AM
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PandaBear Offline
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Is that for IS 250 or 350? They don't "wear out" by 60k, and I read a TSB on how to check these plugs by checking if the center electrodes are "shorted" to the side electrodes using a multi-meter (check if they are open or if they have some measurable resistance).


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
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