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Spark Plugs #5331383 01/24/20 09:00 PM
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A_Spruce Offline OP
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Hey guys,

My 03 Suburban has 153K on it, unknown whether the plugs have ever been out of it. I did a search of the forum for spark plug topics, none really answered my question. The aforementioned topics referred to service bulletins and specific AC Delco plug numbers for the pre and post '03 - '04 model year.

Given a choice, do you stick with ACD, switch to NGK, or go with some other brand? I, personally, like to stick to OEM or name brands that are trusted by the industry, but have been out of the game long enough that I no longer know what brands are acceptable and those that should be shunned like the red headed stepchild of [censored]! grin2


'03 Suburban
Re: Spark Plugs [Re: A_Spruce] #5331384 01/24/20 09:01 PM
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JeffKeryk Offline
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OEM for me. Or maybe those fancy E3 things that increase everything...


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Spark Plugs [Re: A_Spruce] #5331400 01/24/20 09:27 PM
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DrDanger Offline
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Here is the science info on newer spark plug technology:

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5323204/2

I would go with iridium and be good for, well at least as much miles.

Re: Spark Plugs [Re: A_Spruce] #5331401 01/24/20 09:28 PM
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BretK Offline
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I use AC Delco in my 2000 Buick LeSabre. No complaints.

Re: Spark Plugs [Re: A_Spruce] #5331407 01/24/20 09:39 PM
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slacktide_bitog Offline
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Many of the ACDelco iridiums are actually made by NGK. Also, NGK makes good wires that are numbered and come in a pretty blue color smile

If the spark plugs are difficult to change on your Suburban, you may want to consider iridium or even NGK's new ruthenium, so you never have to do them again!

Re: Spark Plugs [Re: slacktide_bitog] #5331416 01/24/20 09:49 PM
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bbhero Online Content
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This is exactly right ^^^^^^^^

In my opinion smile


Nissan Altima 3.5 Coupe
Cam2 SuperproMax 5w30 Carquest r84356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: Spark Plugs [Re: A_Spruce] #5331435 01/24/20 10:19 PM
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A_Spruce Offline OP
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I am concerned about pulling the existing plugs, as I've heard these engines don't like to give originals up easily after 100k.


'03 Suburban
Re: Spark Plugs [Re: slacktide_bitog] #5331436 01/24/20 10:23 PM
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A_Spruce Offline OP
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Originally Posted by slacktide_bitog
If the spark plugs are difficult to change on your Suburban, you may want to consider iridium or even NGK's new ruthenium, so you never have to do them again!


I don't even want to do them now! crzy grin2

The reasoning behind changing them out is that I feel that MPG is a tad lower than it could/should be, and cold idle is a bit rough. Picking up just 2 or 3 MPG will pay for the plugs within a few tanks. cool


'03 Suburban
Re: Spark Plugs [Re: A_Spruce] #5331442 01/24/20 10:28 PM
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GMBoy Offline
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Those plugs are SIMPLE to change -you can do plugs and wires in under 2hours taking your time. I have it down to about 45min-1hr. The only difficult one is the back plug on the paassenger side. Bend the AC drain shield a little to make room and use a 1" extension or just get that one plug from underneath. You will spend more time on that plug than the other 3 on that same side lol. Me personally, I have been running Autolite Iridium XP plugs with good results.

Re: Spark Plugs [Re: A_Spruce] #5331467 01/24/20 11:08 PM
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clinebarger Offline
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I've pulled original plugs out of these past 250K....In a non-corrosive environment, It's not an issue!

#8 is fun on a Suburban with rear Heat & A/C! Seat the plug wires on the spark plugs first....Then the coils!

Use Delco Iridium plugs & Delco plug wires. Your 'Burb takes 2 different plug wires depending on the Ignition Coils you have......Long ones for Hitachi coils & Short ones for the Delco coils. Most dealers & part stores will sell the long wires regardless making the job look hacked-up if you have Delco coils.


LS3 plug wires GM# 19351593 ACD# 748RR fits GMT-800 Delco Coils perfectly! Better than the OE wires even, They are red in color if it matters. WILL NOT fit trucks/SUV's with Hitachi coils.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Spark Plugs [Re: clinebarger] #5331491 01/25/20 12:22 AM
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A_Spruce Offline OP
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Originally Posted by clinebarger
I've pulled original plugs out of these past 250K....In a non-corrosive environment, It's not an issue!

#8 is fun on a Suburban with rear Heat & A/C! Seat the plug wires on the spark plugs first....Then the coils!

Use Delco Iridium plugs & Delco plug wires. Your 'Burb takes 2 different plug wires depending on the Ignition Coils you have......Long ones for Hitachi coils & Short ones for the Delco coils. Most dealers & part stores will sell the long wires regardless making the job look hacked-up if you have Delco coils.


LS3 plug wires GM# 19351593 ACD# 748RR fits GMT-800 Delco Coils perfectly! Better than the OE wires even, They are red in color if it matters. WILL NOT fit trucks/SUV's with Hitachi coils.



This is 100% a California truck, so there is little to no corrosion anywhere. In fact, until the last few years, she's been garage kept, so darned near showroom new looking. I've owned her for a year, previous owner was the son-in-law of the original owner, as far as I can tell. A little neglected here and there, but overall very good bones and has responded well to the TLC I've given her over the past year.

Baby does indeed have the rear HVAC system, which I was surprised was plumbed all the way from the front instead of a "stand alone" unit.

Question for you, should the wires be changed with the plugs? Sorry for the Newb question, but my mechanical knowledge is over 30 years old. Back in the day, you just changed everything out, today seems to take a more surgical approach.


'03 Suburban
Re: Spark Plugs [Re: A_Spruce] #5331513 01/25/20 02:21 AM
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I just changed the plugs on a 2003 Silverado. It had an old set of ACDelco double platinums in it that had ~115k miles on them. (220k on the engine total) The gaps on them ranged from .035" to .065" with the platinum completely gone from 3 of them. The truck ran ok before with no misfires. I put in new NGK TR55IX plugs gapped at .060", along with new Taylor thundervolt wires, and it runs better now. It idles smoother and seems more responsive.

The #8 plug isn't an issue for me. I just use a 3/4" wrench on the end of plug socket. It's out in less than a minute.

I've never understood the move to .040" gap. The best guess I have is to just consolidate inventory. I use NGK TR55 plugs at .060" in my 2002 Tahoe.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Spark Plugs [Re: A_Spruce] #5331515 01/25/20 02:27 AM
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GMBoy Offline
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Yes change wires with the plugs.

Re: Spark Plugs [Re: A_Spruce] #5331571 01/25/20 06:38 AM
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Audios Offline
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Bosch makes a good fine wire platinum plug thats inexpensive for these trucks, 6704.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI-T6 5/40
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: Spark Plugs [Re: A_Spruce] #5331576 01/25/20 06:45 AM
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ka9mnx Offline
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I normally use OEM but if Denso has an Iridium replacement, that's what I use.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
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