2004 Yukon spark plugs

[poffpilot]

Hello, I’m looking to replace the spark plugs on my 2004 5.3 flex Yukon but I’m having a challenge finding the correct replacement. Note, I have not pulled any yet as I’d like to have the new ones in hand first. It is still running fine with 190k with original plugs. Advanced Auto only shows Denso IT16TT for the iridium plugs. A cross reference from Denso shows Delco 41-100 as equivalent but I’m also reading that plug has been updated to the 41-162. Amazon indicates than neither fit my truck. I’m about to go with the delco 41-162 anyway but I thought I’d run this question by the experts here. Recommendations?
Thank You

 

[wjburken]

Hello, I’m looking to replace the spark plugs on my 2004 5.3 flex Yukon but I’m having a challenge finding the correct replacement. Note, I have not pulled any yet as I’d like to have the new ones in hand first. It is still running fine with 190k with original plugs. Advanced Auto only shows Denso IT16TT for the iridium plugs. A cross reference from Denso shows Delco 41-100 as equivalent but I’m also reading that plug has been updated to the 41-162. Amazon indicates than neither fit my truck. I’m about to go with the delco 41-162 anyway but I thought I’d run this question by the experts here. Recommendations?
Thank You

I’d go with AC Delco 41-962. Rockauto is where I’d get them before I’d buy from Amazon as Amazon has issues with counterfeit parts sometimes.

 

[poffpilot]

I’d go with AC Delco 41-962. Rockauto is where I’d get them before I’d buy from Amazon as Amazon has issues with counterfeit parts sometimes.

Thank you. I believe the 41-962 is a platinum plug. I’m trying to stay with iridium.

 

[OR VietVet]

I looked at RA. They do not list an AC Delco plug. They do list a Denso #4713 instead. I looked at Genuine GM Parts and they list a genuine gm part #19299585 and that crosses to the Denso #4713. These are the Iridium plugs.

 

[OR VietVet]

By the way. Welcome to your first posts at the forum. You been a member longer than me.

By the way, you should never leave a spark plug in that long, no matter how well it runs.

 

[poffpilot]

By the way. Welcome to your first posts at the forum. You been a member longer than me.

By the way, you should never leave a spark plug in that long, no matter how well it runs.

Thank our very much. I realize they should have been replaced long ago. I also realize that I have to be super careful removing them. I’ll go take a look at Rock Auto, I’ve ordered from them before.
Thank you again.

 

[Fless]

This thread might answer your questions, or confuse you more (link starts at my post, but feel free to start at the beginning):

Question on AC Delco plugs

Which spark plugs do you use? Anyone know the part number for Iridium AC Delco plugs? This is going into a 2001 Yukon XL 5.3 4x4

www.tahoeyukonforum.com

 

[S33k3r]

Thank our very much. I realize they should have been replaced long ago. I also realize that I have to be super careful removing them. I’ll go take a look at Rock Auto, I’ve ordered from them before.
Thank you again.

Don't forget the forum discount from Rock Auto!

 

[poffpilot]

This thread might answer your questions, or confuse you more (link starts at my post, but feel free to start at the beginning):

Question on AC Delco plugs

Which spark plugs do you use? Anyone know the part number for Iridium AC Delco plugs? This is going into a 2001 Yukon XL 5.3 4x4

www.tahoeyukonforum.com

Thank you for the previous answer. I just removed a single plug and found mine are Bosch HR8LII33U Double Iridium. It is in excellent shape after 20 years and 190k miles. I’ll be hard pressed to go with anything else at this point. Rock Auto list this as Bosch 9602.

 

[S33k3r]

Be careful. I've seen a lot of people across multiple GMT800 boards have problems with non-Delco plugs. This is on 4.8s, 5.3s, and 6.0s. I hope you have good luck with what you pick.

I kind of wonder if those Bosch came from the factory, though. I would think your plugs have been changed at least once.

 

[Fless]

Thank you for the previous answer. I just removed a single plug and found mine are Bosch HR8LII33U Double Iridium. It is in excellent shape after 20 years and 190k miles. I’ll be hard pressed to go with anything else at this point. Rock Auto list this as Bosch 9602.

Then those aren't the OE plugs; the originals were changed at some point.

 

[poffpilot]

Perhaps so, but I bought the truck with 5k miles from the dealership and it had not been registered before I got it. So they have at least 185k miles and still look good. I really expected to see delco 41-110s. Point is, I’m very impressed with the Bosch Double Iridium plugs, OEM or not.

 

[Doubeleive]

Perhaps so, but I bought the truck with 5k miles from the dealership and it had not been registered before I got it. So they have at least 185k miles and still look good. I really expected to see delco 41-110s. Point is, I’m very impressed with the Bosch Double Iridium plugs, OEM or not.

Are you sure you didn't have a "tune up" at some point in the last 190k? The earliest I can find those plugs even being available is either 2007 or 2011

 

[Fless]

Are you sure you didn't have a "tune up" at some point in the last 190k? The earliest I can find those plugs even being available is either 2007 or 2011

It'll be interesting to know if all the plugs are Bosch or if that one was replaced tracking down a misfire or something else.

 

[poffpilot]

Are you sure you didn't have a "tune up" at some point in the last 190k? The earliest I can find those plugs even being available is either 2007 or 2011

You are correct I my memory has apparently faded. I checked my records and found that I replaced the plugs (ACDelco -12571164) in 2015 with 96,560 miles on them. That’s when I went to the Bosch.
I stand corrected

 

[poffpilot]

It'll be interesting to know if all the plugs are Bosch or if that one was replaced tracking down a misfire or something else.

Thank you for being persist. I checked my records (finally) and apparently my memory has faded a bit. I did in fact change the plugs in 2015 with 96560 miles them. The original were ACDelco 12571164. That’s when I installed the Bosch. I also changed the ignition leads as well. I appreciate all of the responses.

 

[poffpilot]

By the way. Welcome to your first posts at the forum. You been a member longer than me.

By the way, you should never leave a spark plug in that long, no matter how well it runs.

Apparently my memory has faded a bit. I checked my records (finally) and I did in fact change the plugs in 2015 with 96560 miles on them. The originals were ACDelco 12571164. That’s when I installed the Bosch 9602 Double Iridium. Thank you for your responses.

 

[wjburken]

Apparently my memory has faded a bit. I checked my records (finally) and I did in fact change the plugs in 2015 with 96560 miles on them. The originals were ACDelco 12571164. That’s when I installed the Bosch 9602 Double Iridium. Thank you for your responses.

If you’re married, I hope you do a better job of remembering your anniversary.

 

[wjburken]

If you’re married, I hope you do a better job of remembering your anniversary.

Or that you are even married.

 

[poffpilot]

Or that you are even married.

As my daughter would say: Just another reason you’re single.