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Opinions on used spark plugs #4683507
03/03/18 07:52 PM
03/03/18 07:52 PM
Joined: Jun 2004
Posts: 377
Va
FFeng7 Online content OP
FFeng7  Online Content OP
Joined: Jun 2004
Posts: 377
Va
I finally changed the spark plugs in my Dodge. I have no idea of the mileage on these. At least 65-70K because that's how long I've owned the truck. Still ran great on the old sparkplugs and runs the same on the new ones. Replaced with NGK V Power. Also replaced the wires, cap and rotor. What's you guys opinion on the old ones??


2002 Dakota Quad Cab 4x4-Delo XLE 10w30-Fram PH16 Filter
2007 Cobalt LT-Supertech High Mileage Synthetic 5w30-Parts Plus Filter
Re: Opinions on used spark plugs [Re: FFeng7] #4683510
03/03/18 07:54 PM
03/03/18 07:54 PM
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
They look pretty goo on the cylinder side. The outside looks like poo...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Opinions on used spark plugs [Re: FFeng7] #4683521
03/03/18 08:01 PM
03/03/18 08:01 PM
Joined: Sep 2015
Posts: 1,553
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,553
USA
Those are worn out. Conventional plugs should have a sharp edge on the center electrode.

Re: Opinions on used spark plugs [Re: FFeng7] #4683522
03/03/18 08:03 PM
03/03/18 08:03 PM
Joined: Nov 2006
Posts: 20,145
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,145
MA, Mittelfranken.de
Valve cover gasket leaking on one side? The first one looks off a bit, check the wire to that plug and the terminal inside the cap.


ASE L1, Master. Deutsch Meisterbrief.
Re: Opinions on used spark plugs [Re: FFeng7] #4683633
03/03/18 09:45 PM
03/03/18 09:45 PM
Joined: Jun 2012
Posts: 1,722
USA
oldhp Offline
oldhp  Offline
Joined: Jun 2012
Posts: 1,722
USA
Those are Autolite Platinums. That's why the center electrode is shaped the way it is. Cylinders look to be firing very clean.

Last edited by oldhp; 03/03/18 09:45 PM.

2018 RAM 1500 3.6/8 speed.
2017 Jeep Sahara Unlimited 3.6
"U kan't fixe it......if'n it ain't broke."
Re: Opinions on used spark plugs [Re: FFeng7] #4683645
03/03/18 09:59 PM
03/03/18 09:59 PM
Joined: Jan 2009
Posts: 6,328
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,328
New England
How far off from spec are they on gap?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter
Re: Opinions on used spark plugs [Re: FFeng7] #4683685
03/03/18 11:02 PM
03/03/18 11:02 PM
Joined: Jun 2004
Posts: 377
Va
FFeng7 Online content OP
FFeng7  Online Content OP
Joined: Jun 2004
Posts: 377
Va
The gap on these were not that bad. I didn't actually gap the old ones but compared to the correct gap on the new ones they looked reasonably close. I think the spec was supposed to be .040.


2002 Dakota Quad Cab 4x4-Delo XLE 10w30-Fram PH16 Filter
2007 Cobalt LT-Supertech High Mileage Synthetic 5w30-Parts Plus Filter
Re: Opinions on used spark plugs [Re: FFeng7] #4683743
03/04/18 12:57 AM
03/04/18 12:57 AM
Joined: Apr 2004
Posts: 347
Tennessee
SWS Offline
SWS  Offline
Joined: Apr 2004
Posts: 347
Tennessee
IMO, good preventative maintenance, and you were able to do it yourself - good for you!
You could not have known their condition otherwise.
What time s the total mileage on the vehicle?
Many years ago, I had 2 issues ( different cars, small-block Chevy, and VW Rabbit) in which the internal resistor messed up somehow. Plugs were not that old as I recall, but combustion side turned black from occasional missing. I could read greatly different resistance on the bad ones. Changed the plugs and restored perfect operation. Years later, changed those plugs and they were all perfect light brown.
Similar experience on common Briggs & Stratton lawnmower - changing last years perfect-looking plug with correct gap changes a non-start into first-time start. One variable!

Re: Opinions on used spark plugs [Re: FFeng7] #4683796
03/04/18 07:14 AM
03/04/18 07:14 AM
Joined: May 2015
Posts: 919
Frogland / Brittany
Popsy Online content
Popsy  Online Content
Joined: May 2015
Posts: 919
Frogland / Brittany
Inside part : Look pretty clean, gap seems fairly consistent cheers
Outside part : not so good smile I don't often see rusty plugs on the outside like that...well all my car have their plugs hidden under one million stuff, that could explain !

Well, if they had 65-70K, I still think you did good changing them (especially since you did it yourself), just to prevent some later removing issues, if the rust had gone worse.


96 Barchetta, Motul 300V 5W40 | 98 Barchetta, Quartz 9000 energy 5W40
05 Forfour 95, SHU 0W40 (gf's car) | 10 Colt Ralliart, 300V 0W40
Re: Opinions on used spark plugs [Re: FFeng7] #4683815
03/04/18 08:20 AM
03/04/18 08:20 AM
Joined: Feb 2018
Posts: 509
Chester County/Pa.
BAJA_05 Offline
BAJA_05  Offline
Joined: Feb 2018
Posts: 509
Chester County/Pa.
The two plugs that have some oil/residue on them -- where they the back two on either side closest to the cab of the truck? Asking that because, I changed the plugs on my neighbors truck -- 2000 Dodge Ram 5.2L -- and his back two plugs on opposite sides looked like yours. I replaced with OEM Champion Coppers.


2017 VW Jetta SE TSI 1.4L Turbo (hers)
M1 Euro 0W40 & FU (19K)
2008 Acura TL 3.2L PPPP 0W20 & FU (108K)
2005 Subaru Baja AWD 2.5L N/A 5spd.
QSHM 5W30 & FU (96K)
2000 Ram 4X4 5.9L (93K) PYB 10W30 & FU
Re: Opinions on used spark plugs [Re: FFeng7] #4683871
03/04/18 09:36 AM
03/04/18 09:36 AM
Joined: Dec 2016
Posts: 6,481
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,481
Waco, TX
In aviation, Sparks plugs are never changed until needed.

Those dont look bad at all.

I think a lot of plugs get tossed for no really good reason.


"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: Opinions on used spark plugs [Re: BAJA_05] #4683875
03/04/18 09:39 AM
03/04/18 09:39 AM
Joined: Aug 2010
Posts: 5,746
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,746
Champlain/Hudson Valley
I assume in the photos they are 1-6 left to right and top to bottom.
So which ones had oil deposits?
Looks more like a penetrant was shot on before removal.

I agree with Popsy on the rust. Preventative maintenance is rarely a wasted effort.
I also agree with Linctex in that many a plug is replaced too soon.
My car's plugs were 10K overdue when I got it. Of course there was no change in operation. No sweat there.
It gave me a chance to look things over--just like looking around during an oil change. Get off on the view!

Also, someone could've installed cheap/incorrect ones. This goes for any vehicle.

A friend had an S-10. We changed plugs only a bit early. There was an improvement so that was good.

Re: Opinions on used spark plugs [Re: FFeng7] #4683887
03/04/18 09:51 AM
03/04/18 09:51 AM
Joined: May 2009
Posts: 12,255
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,255
N.H, U.S.A.
One cyl looks to have higher than average deposits possibly a valve/seal guide worn passing oil into CC. Of the Plug in that one was way out of index. causing a higher misfire rate.

Nothing Horrendous.

That gap looks WAY bigger than 1.1MM more at 0.07"


2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Opinions on used spark plugs [Re: ARCOgraphite] #4683908
03/04/18 10:14 AM
03/04/18 10:14 AM
Joined: Nov 2006
Posts: 20,145
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,145
MA, Mittelfranken.de
Indexing usually isn't an issue and it looks to be running a bit richer than the others not oil fouled. Having cap and wires it could be from a terminal or cable causing a slightly higher misfire count (not high enough to set a CEL) or an injector causing a bit of trouble. Checking the wire Ohms and cleaning the terminal cost nothing.

These engines use a Deka injector that are known to have some issues at this age, not a lot but more than I usually see. The ones with issues I see usually have a very slight drip, like one drop every 5-10 seconds.
They are not repairable and should be replace once the issue is confirmed.


ASE L1, Master. Deutsch Meisterbrief.
Re: Opinions on used spark plugs [Re: FFeng7] #4683912
03/04/18 10:21 AM
03/04/18 10:21 AM
Joined: Apr 2004
Posts: 7,760
New York
pbm Offline
pbm  Offline
Joined: Apr 2004
Posts: 7,760
New York
My opinion is that the car is running well according to the look of the plugs....but I would have changed them and probably used the same model plug.


'Journalism is Dead'
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