LT4 Spark Plug Fun
Thread Starter
Racer
Joined: Jul 2022
Posts: 470
Likes: 154
From: Wilmington,Delaware
LT4 Spark Plug Fun
Changed out the plugs on the old girl tonight. Must say #8 was indeed quite the pain. L98 engine took me maybe 30 minutes to do them all of them…..I spent that long just on #8. 1-7 went easy enough. Had to move the ASR for 1 and 2. Was able to use a torque wrench on all but #8. Plugs I pulled out were AC Delco 41-943 and had definitely been in there for a while. NGK TR5IX replaced them. Car definitely seemed to respond nicely to them. Tomorrow will be trans and diff fluid change. Anyone else struggle a bit on #8 ? I know it can’t just be me lol.
Melting Slicks
Joined: May 2019
Posts: 3,095
Likes: 1,339
From: Mid-Atlantic
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Changed out the plugs on the old girl tonight. Must say #8 was indeed quite the pain. L98 engine took me maybe 30 minutes to do them all of them…..I spent that long just on #8. 1-7 went easy enough. Had to move the ASR for 1 and 2. Was able to use a torque wrench on all but #8. Plugs I pulled out were AC Delco 41-943 and had definitely been in there for a while. NGK TR5IX replaced them. Car definitely seemed to respond nicely to them. Tomorrow will be trans and diff fluid change. Anyone else struggle a bit on #8 ? I know it can’t just be me lol.
This is getting ridiculous, Face.
It's consistently the rainiest, grayest, gloomiest state I've ever lived in. All it does is rain around here anyore.
It doesn't even rain this consistently in the pacific northwest.
I'm beginning to think it's a damned conspiracy. lol...
Race Director
Joined: Jul 2004
Posts: 12,672
Likes: 329
From: Scottsdale Arizona
Just went through the same thing.
https://www.corvetteforum.com/forums...e-problem.html
Sounds like you weren’t able to exceed my mistake of losing a plug while trying to install #8
https://www.corvetteforum.com/forums...e-problem.html
Sounds like you weren’t able to exceed my mistake of losing a plug while trying to install #8
Thread Starter
Racer
Joined: Jul 2022
Posts: 470
Likes: 154
From: Wilmington,Delaware
Now if we can get at least 1 day of sunshine around here so we can drive the things.
This is getting ridiculous, Face.
It's consistently the rainiest, grayest, gloomiest state I've ever lived in. All it does is rain around here anyore.
It doesn't even rain this consistently in the pacific northwest.
I'm beginning to think it's a damned conspiracy. lol...
This is getting ridiculous, Face.
It's consistently the rainiest, grayest, gloomiest state I've ever lived in. All it does is rain around here anyore.
It doesn't even rain this consistently in the pacific northwest.
I'm beginning to think it's a damned conspiracy. lol...
Thread Starter
Racer
Joined: Jul 2022
Posts: 470
Likes: 154
From: Wilmington,Delaware
Just went through the same thing.
https://www.corvetteforum.com/forums...e-problem.html
Sounds like you weren’t able to exceed my mistake of losing a plug while trying to install #8
https://www.corvetteforum.com/forums...e-problem.html
Sounds like you weren’t able to exceed my mistake of losing a plug while trying to install #8
Thread Starter
Racer
Joined: Jul 2022
Posts: 470
Likes: 154
From: Wilmington,Delaware
On the LTx, the major impediment to accessing #8 are the fuel lines that run vertically between the exhaust manifold and A/C suitcase. With those lines removed, access to #8 isn't a big deal.
I recently went ape-**** crazy on fixing the oil leaks on my LT1. I did everything, including the oil pan. With so much already disassembled for the leaks, I realized that this was the opportune time to do some baseline maintenance such as plugs, wires and fuel filter. I disconnected the fuel lines at the filter and return junction, went above and removed the clamp on the suitcase, the flex lines to the fuel rail, and lifted the lines out of the car. Access to #8 was then a nothing-burger, so was the fuel filter change-out.
If you're changing spark plugs, you should probably also be changing the fuel filter. Once the filter is loose, lifting the fuel lines up and out is 60 seconds tops if you have the spring-loc release tools in your box. The #8 plug is then easy-peasy.
I recently went ape-**** crazy on fixing the oil leaks on my LT1. I did everything, including the oil pan. With so much already disassembled for the leaks, I realized that this was the opportune time to do some baseline maintenance such as plugs, wires and fuel filter. I disconnected the fuel lines at the filter and return junction, went above and removed the clamp on the suitcase, the flex lines to the fuel rail, and lifted the lines out of the car. Access to #8 was then a nothing-burger, so was the fuel filter change-out.
If you're changing spark plugs, you should probably also be changing the fuel filter. Once the filter is loose, lifting the fuel lines up and out is 60 seconds tops if you have the spring-loc release tools in your box. The #8 plug is then easy-peasy.
