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Which iridium plugs for my avalanche? #4496448
08/23/17 08:31 PM
08/23/17 08:31 PM
Joined: May 2010
Posts: 9,190
North Carolina
spasm3 Online content OP
spasm3  Online Content OP
Joined: May 2010
Posts: 9,190
North Carolina
2003 avalanche 5.3 used for towing, usually in 3rd not OD.

Looking on rock auto, i see

Denso iridium long life 5090
Denso iridium TT 4713
NGK 1465 laser iridium
NGK 7397 iridium IX

Any experiences with one over the others?

Also what is a good set of coil wires?
Standard Motor Products Blue Streak
or
AC Delco professional?


Thanks

Last edited by spasm3; 08/23/17 08:33 PM.

13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496452
08/23/17 08:34 PM
08/23/17 08:34 PM
Joined: Jan 2008
Posts: 10,821
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,821
OH
Originally Posted By: 123
The laser is the best plug the ix the worst, the IX has a single precious metal electrode, the long like a thicker core and the laser has precious metal on both electrodes.


I just asked someone one here about this recently. Since this was via pm I changed their name in the quote above.

Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496478
08/23/17 09:02 PM
08/23/17 09:02 PM
Joined: Apr 2017
Posts: 103
NY
Kage860 Offline
Kage860  Offline
Joined: Apr 2017
Posts: 103
NY
When I did my research for my vehicles I decided to go with the denso iridium long life. Best out of the platinum/iridium ones anyway.


2007 Jeep Liberty
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496527
08/23/17 10:13 PM
08/23/17 10:13 PM
Joined: Nov 2006
Posts: 20,133
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,133
MA, Mittelfranken.de
Laser iridium and Delco OE wires if they are available.


ASE L1, Master. Deutsch Meisterbrief.
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496539
08/23/17 10:43 PM
08/23/17 10:43 PM
Joined: Apr 2016
Posts: 766
Specific Ocean
Kibitoshin Online content
Kibitoshin  Online Content
Joined: Apr 2016
Posts: 766
Specific Ocean
You can't do wrong with the top three listed in your post. The Denso iridium LL's are the cheapest dual element spark plugs out there.

I have Denso's newly released Iridium TT's in my 5.3L right now. Can't really tell if it made a difference from the iridiums I pulled out.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496547
08/23/17 11:01 PM
08/23/17 11:01 PM
Joined: Nov 2004
Posts: 1,814
SD
zrxkawboy Offline
zrxkawboy  Offline
Joined: Nov 2004
Posts: 1,814
SD
I used the Denso 5090 plugs and NAPA Belden wires and they seem to work fine.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Which iridium plugs for my avalanche? [Re: Kibitoshin] #4496579
08/24/17 12:59 AM
08/24/17 12:59 AM
Joined: Nov 2004
Posts: 7,766
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,766
Texas
Originally Posted By: Kibitoshin
You can't do wrong with the top three listed in your post. The Denso iridium LL's are the cheapest dual element spark plugs out there.

I have Denso's newly released Iridium TT's in my 5.3L right now. Can't really tell if it made a difference from the iridiums I pulled out.


The TT's are a good plug. They aren't that new because I installed a set 2 years ago in a little Saturn SC2.

Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496745
08/24/17 08:34 AM
08/24/17 08:34 AM
Joined: Aug 2011
Posts: 3,210
n.c.
gman2304 Offline
gman2304  Offline
Joined: Aug 2011
Posts: 3,210
n.c.
I used new OEM Delco plugs in my 2005 5.3 Avalanche last year. The original Delco plugs lasted for over 100,000 miles, so I didn't see a need to switch brands. I reused my old wires which still looked good and haven't had a problem with them so far. The wire boots are a bear to remove from the plugs without damaging the shields. I bought a wire removal tool, and used a can of PBblaster to get mine off. IIRC I had to loosen the PS pump to get the left front plug out. It also helps to be a contortionist for both rear plugs. YMMV.

Re: Which iridium plugs for my avalanche? [Re: gman2304] #4496809
08/24/17 09:24 AM
08/24/17 09:24 AM
Joined: Nov 2004
Posts: 7,766
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,766
Texas
Originally Posted By: gman2304
I used new OEM Delco plugs in my 2005 5.3 Avalanche last year. The original Delco plugs lasted for over 100,000 miles, so I didn't see a need to switch brands. I reused my old wires which still looked good and haven't had a problem with them so far. The wire boots are a bear to remove from the plugs without damaging the shields. I bought a wire removal tool, and used a can of PBblaster to get mine off. IIRC I had to loosen the PS pump to get the left front plug out. It also helps to be a contortionist for both rear plugs. YMMV.


I would have replaced the wires too. AC Delco replacements are only about $40 on rockauto.

Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496939
08/24/17 12:30 PM
08/24/17 12:30 PM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
Boston, MA
Delcos +1,000


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4496964
08/24/17 12:59 PM
08/24/17 12:59 PM
Joined: Jan 2004
Posts: 4,248
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,248
California
I believe Denso or NGK makes the OEM Delco double-iridium plug, use any of them with confidence. I wouldn't waste time with single-iridium(NGK IX/Denso Iridium Power). GM used to make their own spark plugs, but it seems like Denso/NGK makes the Delco OE series, and Autolite/Federal-Mogul makes their copper and single-platinum/Rapidfire plugs.

OEM wires(Delco OE) are best, I did use the Professional line in a friend's truck and so far, so good.

Last edited by nthach; 08/24/17 01:01 PM.
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4497398
08/24/17 10:59 PM
08/24/17 10:59 PM
Joined: Mar 2014
Posts: 61
The Rockies
Blang Offline
Blang  Offline
Joined: Mar 2014
Posts: 61
The Rockies
I've had good luck with ACDelco Iridium in Vortec V8s and my Ecotec. They're usually a decent deal, and even better you can get manufacture rebates as well right now.


03 Cavalier 239k M1HM 5w30
96 Mazda B2300 207k PennzPlat HM 5w30
11 200 105k PPHM 5w30
01 K1500 4.8 184k M1HM 5w30
Acdelco, Mopar, and MC filters
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4497572
08/25/17 08:24 AM
08/25/17 08:24 AM
Joined: May 2008
Posts: 2,034
SoCal
UG_Passat Offline
UG_Passat  Offline
Joined: May 2008
Posts: 2,034
SoCal
Originally Posted By: spasm3
2003 avalanche 5.3 used for towing, usually in 3rd not OD.

Looking on rock auto, i see

Denso iridium long life 5090
Denso iridium TT 4713
NGK 1465 laser iridium
NGK 7397 iridium IX

Any experiences with one over the others?

Also what is a good set of coil wires?
Standard Motor Products Blue Streak
or
AC Delco professional?


Thanks


NGK Laser Iridium (.6mm wire) and Denso Iridium Long Life (.7mm wire) compete against each other with the iridium tipped center electrode & platinum disc on the ground electrode.

Then Denso TT is the .4mm wire with a platinum alloy cylinder welded to the ground electrode, to reduce quenching of the flame kernel). It tries to balance performance with longevity

the NGK Iridium IX has a .6mm iridium wire with a tapered ground electrode to reduce quenching of the flame kernel. It would have the worst longevity, so if you don't mind replacing spark plugs more often, that's your choice.


2016 VW Tiguan|APR Stage 1|Neuspeed P-Flo|Osram CBI|Redline 5w30
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4497677
08/25/17 11:02 AM
08/25/17 11:02 AM
Joined: Nov 2003
Posts: 1,140
Middle of Iowa
DriveHard Offline
DriveHard  Offline
Joined: Nov 2003
Posts: 1,140
Middle of Iowa
I run the Denso TT's in my LS chevy.


Smile, it increases your face value
2011 Silverado Crew Cab LT 6.2L/6spd
2017 Jeep Renegade Trailhawk (wife's)
2007 Nissan Xterra (trail toy)
2013 Fiat 500 Abarth (my DD)
Elio...?
Re: Which iridium plugs for my avalanche? [Re: spasm3] #4497748
08/25/17 12:37 PM
08/25/17 12:37 PM
Joined: Oct 2008
Posts: 19,139
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,139
Sunny Florida
Those NGK hybrids (plat/iridium) are hard to beat, same as OEM. We try to get those out by 100k miles but depending on circumstances we have run them to ridiculous mileages.

The newer 6.0's with VVT seem to be the most fussy yet, they like new plugs at 100k miles or so.

Always change the wires, all you guys moaning about your pickups make sure and do a van some time!!!


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
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