Wrong spark plug?

kennerz · December 31, 2019

NGK P/N is ILTR5E11 for the LT1 version of the trusty TR5

This is the iridium version. May sound elementary, but you need to order the same full part number to get the correct plug. There are too many variants where you won't get the right one if you say just order a TR5.

Mozzer · December 31, 2019

NGK P/N is ILTR5E11 for the LT1 version of the trusty TR5

This is the iridium version. May sound elementary, but you need to order the same full part number to get the correct plug. There are too many variants where you won't get the right one if you say just order a TR5.

Thanks very much, so this part number has the longer reach electrode as per your originals? I only question cos the image on NGKs Web page shows the same shorter reach as the others mentioned.

I will definitely not buy anything without seeing it in person anyway.

2014, 5.3, 4x4, work truck

kennerz · January 1, 2020

From what I have seen it's the overall length that matters not just the longer electrode that protrudes into the chamber. With that P/N I provided I have had zero issues. they are just as long as the factory plug. This is on a 6.2 L86. So what I'm saying is the electrode length will not look identical to the factory plug but the thread body is a little longer that makes up the difference. When you see them they look right and you can't distinguish a difference in length vs the OEM. The OAL is what gets it into the right position/depth in the combustion chamber.

The shorter ones are noticeably shorter, and many places have them listed as the correct plug in error. If it makes you feel better find a matching OEM delco, nothing wrong with those either. I prefer NGK then Denso/Delco in that order. all are good.

Mozzer · January 1, 2020

From what I have seen it's the overall length that matters not just the longer electrode that protrudes into the chamber. With that P/N I provided I have had zero issues. they are just as long as the factory plug. This is on a 6.2 L86. So what I'm saying is the electrode length will not look identical to the factory plug but the thread body is a little longer that makes up the difference. When you see them they look right and you can't distinguish a difference in length vs the OEM. The OAL is what gets it into the right position/depth in the combustion chamber.

The shorter ones are noticeably shorter, and many places have them listed as the correct plug in error. If it makes you feel better find a matching OEM delco, nothing wrong with those either. I prefer NGK then Denso/Delco in that order. all are good.

Absolutely, the length from the shoulder to the tip is what decides the location in the head. That's what was off on both other ones I've seen so far.

If this wasn't a spark plug discussion I'd be a bit concerned how the above sentence would sound [emoji23]

2014, 5.3, 4x4, work truck