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GM 5.3L DoD 100k miles spark plugs #4447799
07/02/17 08:51 PM
07/02/17 08:51 PM
Joined: May 2005
Posts: 533
Idaho
sprite1741 Offline OP
sprite1741  Offline OP

Joined: May 2005
Posts: 533
Idaho
Just did spark plugs on my 2005. ACDelco #110 iridium went in from AZ with new wires. 4 of those are from DoD cylinders. In for 12 years, came right out no problems. No worries with these plugs. Always Chevron Supreme 5w30 and Sinclair ethanol free whenever possible for fuel. Probably could have went a lot longer.


2005 Grand Prix GXP 5.3L Supertech Synthetic Dexos 5w30 Fram Ultra 3506
1986 Dodge Lancer 2.2L Turbo, Supertech Synthetic 10w30 Fram Ultra 3614
Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4447813
07/02/17 09:04 PM
07/02/17 09:04 PM
Joined: Dec 2005
Posts: 750
Virginia
cpayne5 Offline
cpayne5  Offline

Joined: Dec 2005
Posts: 750
Virginia
Just got in from doing the same job in our '05 Suburban. Looks about the same as what I pulled (mine has 112k). NGK TR5IXs went back in.

Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4447815
07/02/17 09:05 PM
07/02/17 09:05 PM
Joined: Feb 2014
Posts: 142
ga
faltic Offline
faltic  Offline

Joined: Feb 2014
Posts: 142
ga
Look good to me. Now I don't feel so bad about the OEM plugs still being in the '03 Honda Element for thirteen years and 204,000 miles.


--------------------------------
17 Highlander 3.5 2wd AT 20k+
95 Tacoma 2.4 2wd AT 187k+
07 EX250 21k+
09 EN500 11k+
11 PCX 125 5K+
Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4447823
07/02/17 09:11 PM
07/02/17 09:11 PM
Joined: May 2010
Posts: 9,857
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 9,857
out there
I have been thinking about changing them in the avalanche, 75k or so, but a lot of towing in third gear. Yours look good, maybe i'm ok till 100k.


13 elantra 75k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 9500 miles m1 0w30
Re: GM 5.3L DoD 100k miles spark plugs [Re: spasm3] #4447835
07/02/17 09:25 PM
07/02/17 09:25 PM
Joined: Dec 2005
Posts: 750
Virginia
cpayne5 Offline
cpayne5  Offline

Joined: Dec 2005
Posts: 750
Virginia
Originally Posted By: spasm3
I have been thinking about changing them in the avalanche, 75k or so, but a lot of towing in third gear. Yours look good, maybe i'm ok till 100k.


No doubt you're fine.

Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4447837
07/02/17 09:26 PM
07/02/17 09:26 PM
Joined: May 2016
Posts: 725
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline

Joined: May 2016
Posts: 725
Canada


Did you measure the gap on the plugs? they do open up by burning back the iridium, but slowly.
The tips are so small to see the burn, you need a magnifier to see it.

The kicker is these days you can't wait for plugs to misfire or the unburned HCs will damage
the cat converters!!

Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4447914
07/02/17 11:04 PM
07/02/17 11:04 PM
Joined: Jun 2002
Posts: 19,764
Iowegia - USA
MolaKule Offline
Global Moderator
MolaKule  Offline
Global Moderator

Joined: Jun 2002
Posts: 19,764
Iowegia - USA
The DOD plugs are better than I expected. I would have suspected more deposits.

I changed mine (on 2008 TrailBlazer) at about 85,000 miles with about the same amount of deposits.

Last edited by MolaKule; 07/02/17 11:04 PM.

"I can't change the direction of the wind, but I can adjust my sails to always reach my destination." Jimmy Dean
Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4447945
07/02/17 11:50 PM
07/02/17 11:50 PM
Joined: Oct 2014
Posts: 4,284
Utah
CKN Offline
CKN  Offline

Joined: Oct 2014
Posts: 4,284
Utah
If you believe the Internet every 5.3 motor is on the verge of being an oil burner because of AFM.

Last edited by CKN; 07/02/17 11:51 PM.
Re: GM 5.3L DoD 100k miles spark plugs [Re: sprite1741] #4448348
07/03/17 01:18 PM
07/03/17 01:18 PM
Joined: Dec 2006
Posts: 1,852
NY, NY
NYEngineer Offline
NYEngineer  Offline

Joined: Dec 2006
Posts: 1,852
NY, NY
I changed the plugs in my 09 Suburban yesterday. They did not look as good as Sprite's plugs. We have oxygenated, ethanol gas in NY so I guess that's harder on plugs. I have my DOD system blocked by a module right now.

Re: GM 5.3L DoD 100k miles spark plugs [Re: faltic] #4449032
07/04/17 05:40 AM
07/04/17 05:40 AM
Joined: Jan 2011
Posts: 2,938
N.Ohio
Lubener Offline
Lubener  Offline

Joined: Jan 2011
Posts: 2,938
N.Ohio
Originally Posted By: faltic
Look good to me. Now I don't feel so bad about the OEM plugs still being in the '03 Honda Element for thirteen years and 204,000 miles.

You will feel the pain when you try to remove them someday.


The "thinking" man's friend.
Re: GM 5.3L DoD 100k miles spark plugs [Re: NYEngineer] #4449224
07/04/17 10:00 AM
07/04/17 10:00 AM
Joined: Mar 2010
Posts: 5,411
Iowa
The_Eric Offline
The_Eric  Offline

Joined: Mar 2010
Posts: 5,411
Iowa
Originally Posted By: NYEngineer
I changed the plugs in my 09 Suburban yesterday. They did not look as good as Sprite's plugs. We have oxygenated, ethanol gas in NY so I guess that's harder on plugs. I have my DOD system blocked by a module right now.


It is not. Take it from someone who has used it for practically all of his driving life. Someone who has been toying with car's and trucks for better than 20 years- the last 8 professionally. Ethanol at normal percentages is not the devil, and it certainly isn't harder on plugs.


2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M
Re: GM 5.3L DoD 100k miles spark plugs [Re: Lubener] #4449227
07/04/17 10:01 AM
07/04/17 10:01 AM
Joined: Mar 2010
Posts: 5,411
Iowa
The_Eric Offline
The_Eric  Offline

Joined: Mar 2010
Posts: 5,411
Iowa
Originally Posted By: Lubener
Originally Posted By: faltic
Look good to me. Now I don't feel so bad about the OEM plugs still being in the '03 Honda Element for thirteen years and 204,000 miles.

You will feel the pain when you try to remove them someday.


I doubt it. I've pulled plenty out at that mileage, and they always let loose without much drama.


2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M
Re: GM 5.3L DoD 100k miles spark plugs [Re: faltic] #4449271
07/04/17 10:39 AM
07/04/17 10:39 AM
Joined: Apr 2017
Posts: 1,520
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline

Joined: Apr 2017
Posts: 1,520
Ontario, Canada
Originally Posted By: faltic
Look good to me. Now I don't feel so bad about the OEM plugs still being in the '03 Honda Element for thirteen years and 204,000 miles.


And you don't have misfires? That is double what the factory says to go.

If they are Denso plugs, I am surprised they have not blown out of the head.

Last edited by mightymousetech; 07/04/17 10:40 AM.

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