Which is correct spark plug? 2006 5.3

Cmcolfax

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I keep finding multiple references to two different AC Delco part numbers.

ACDelco 41-110 Professional Iridium*

ACDelco 41-962 Professional Platinum

I'm dealing with the well documented smoky startup, ordered the revised valve cover, gonna clean the TB while I have it off and do the piston soak.



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Bonecollector

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Iridium cost more but last a lot longer than the platinums, both will work just fine in your truck, swap your wires out when your in there


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Cmcolfax

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I keep finding multiple references to two different AC Delco part numbers.

ACDelco 41-110 Professional Iridium*

ACDelco 41-962 Professional Platinum

I'm dealing with the well documented smoky startup, ordered the revised valve cover, gonna clean the TB while I have it off and do the piston soak.



Sent via Turbocharged Droid

I keep finding multiple references to two different AC Delco part numbers.

ACDelco 41-110 Professional Iridium*

ACDelco 41-962 Professional Platinum

I'm dealing with the well documented smoky startup, ordered the revised valve cover, gonna clean the TB while I have it off and do the piston soak.



Sent via Turbocharged Droid


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Bonecollector

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Don't know why you quoted yourself but either plug will work it's just which one will last longer, iridium will outlast platinum, they both ignite gasoline the same


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Cmcolfax

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Don't know why you quoted yourself but either plug will work it's just which one will last longer, iridium will outlast platinum, they both ignite gasoline the same


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Didn't mean to.

Meant to post that I confirmed the Iridium were only specified for 07+

Obviously both will work... Just sharing what I learned after asking a question

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Bonecollector

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All good, which did you decide to go with? Your truck smokes on start up? Have you started tuning it up?


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Cmcolfax

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All good, which did you decide to go with? Your truck smokes on start up? Have you started tuning it up?


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I went with the 962 Platinum

I did the piston soak, TB cleaned, new Denso wires, MAF cleaned, revised DS valve cover replacement.

Mostly better now.

No more P300 random multiple misfire code.

Still throwing Evaporative Emission Canister and Knock Sensor codes...

I'll get to those next.

Gotta deal with stoopid insurance company from the guy who rear ended my DD Jetta...

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cedens

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All i know is the same plug goes on both my 5.3's and my 6.0's

when i replaced on the 06 some years back the parts guy sold me the hotter plugs, noticed zero differenc
 

PrplGld

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I'm dealing with the well documented smoky startup, ordered the revised valve cover, gonna clean the TB while I have it off and do the piston soak.

I've got that also. Not every start, but on most I'll get 2-3 seconds of black smoke. I had been told it was a leaking valve stem seal. Been making plans to replace them soon.

Doesn't burn oil any othe time, engine runs well otherwise. It's an '05 GMC Sierra 4.8L with ~253k miles.

Is there something else I need to check?
 

adriver

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Old thread, but
The Iridium plug, 41-110 (with a .040 gap) was the originally installed plug when they started the NBS/Gen III LS. I think it was in 2003, but at some point early on, they changed the plug to the platinum and it became the superseded part number. The platinum plug 41-962 has a .060 gap. I think I have only seen them come pre-gapped, but you can use either one.

The Iridiums will last about twice as long (100k miles vs ~60K miles) but also cost about twice as much. SUPPOSEDLY the iridiums are two hairs better for performance, but if someone knows details why, they know more than I do about em. I think it has to do with the shorter gap having a "more responsive spark". I felt an improvement when I installed iridiums, but that could obviously be from just putting in new plugs so it's not really fair to mention. My guess is GM only did it, (downgraded) to save a few bucks.

In the 02 owner's manual it has the replacement plug listed as NGK PZTR5A15 (iridium)
NGK PZTR5A-15 - Cross Reference | sparkplug-crossreference.com
(The GM part number for 4.8/5.3 is PTJ14R15. For the 6.0 it is PTZ16R15, yet both have the same NGK plug number).
 

Shaggy

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Old thread, but
The Iridium plug, 41-110 (with a .040 gap) was the originally installed plug when they started the NBS/Gen III LS. I think it was in 2003, but at some point early on, they changed the plug to the platinum and it became the superseded part number. The platinum plug 41-962 has a .060 gap. I think I have only seen them come pre-gapped, but you can use either one.

The Iridiums will last about twice as long (100k miles vs ~60K miles) but also cost about twice as much. SUPPOSEDLY the iridiums are two hairs better for performance, but if someone knows details why, they know more than I do about em. I think it has to do with the shorter gap having a "more responsive spark". I felt an improvement when I installed iridiums, but that could obviously be from just putting in new plugs so it's not really fair to mention. My guess is GM only did it, (downgraded) to save a few bucks.

In the 02 owner's manual it has the replacement plug listed as NGK PZTR5A15 (iridium)
NGK PZTR5A-15 - Cross Reference | sparkplug-crossreference.com
(The GM part number for 4.8/5.3 is PTJ14R15. For the 6.0 it is PTZ16R15, yet both have the same NGK plug number).

Nice info @adriver ! Thanks for posting it.
 

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