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Spark Plug Change Interval on 5.3L

FL335i

By FL335i
in Engines & Drivetrain

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ic3man5 Enthusiast

ic3man5

Posted
Posted

Just did a plug and wire change trying to track down other problems. These plugs in the pictures had 63K miles on them. 2015 Silverado 5.3L. There was one or two that looked worn on an angle but nothing I'd worry about. I would consider these put under extreme service and more wear than normal (My truck very rarely doesn't see red-line and a lot of towing). I might have noticed a little bit better idle but probably all in my head.

 

AC Delco 12622441

AC Delco 758EE

 

 

Passenger Front:

passenger_side_spark.jpg

 

Passenger Side:

passenger_side_spark_side.jpg

 

Driver Side:

driver_side_spark_side.jpg

 

Driver Front:

driver_side_spark.jpg

Doublebase Enthusiast

Doublebase

Posted
Posted

Those plugs look like they could easily go another 50,000 miles. Very nice! 
 

I think one of the worst things that happened to technicians was the development of long lasting plugs (iridium, platinum, etc). We used to change these things every 30,000 miles, along with coolant. Oil changes every 3,000 miles. Now? Techs are chasing electrical issues that the manufacturer won’t pay them for.

ic3man5 Enthusiast

ic3man5

Posted
Posted
12 hours ago, Doublebase said:

Those plugs look like they could easily go another 50,000 miles. Very nice! 
 

I think one of the worst things that happened to technicians was the development of long lasting plugs (iridium, platinum, etc). We used to change these things every 30,000 miles, along with coolant. Oil changes every 3,000 miles. Now? Techs are chasing electrical issues that the manufacturer won’t pay them for. 

 

oh yeah and the labor to change these plugs isn't worth it unless you have a lot of free time on your hands and like swearing. #8 cylinder (passenger back) took about 25 minutes alone to figure out how to get out. I'd like to meet the engineer that decided we didn't need that extra 1/2" there. My idle does seem to have improved but I'm OCD and no one else in the world would notice it.

  • 2 months later...
davester Senior Enthusiast

davester

Posted
Posted

If the truck is running properly, 100k change intervals are fine.  If it isn't, then the plugs can get fouled or damaged, and need earlier replacement, but you'll also want to fix the underlying problem causing the plugs to need replacing...

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