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How to Replace the Spark Plugs on a Silverado/Sierra

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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby JCunningham » Mar 04 2011, 6:11am

use a platinum gaper for platinum plugs. If you use a regular gaper you will damage the plugs.
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Re: How to replace spark plugs (Pics coming soon)

Postby fz1rider » Jul 13 2011, 2:10am

lzn197 wrote:ALWAYS stick with as close to original equipment Spark Plugs as you can. Lots of crap and hype out there in the aftermarket world.

Truer words were never spoken. AC Delco Platinum are Primo!
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Re: How to replace spark plugs (Pics coming soon)

Postby BlackZ71 » Feb 14 2012, 4:12am

EKinMN wrote:nutter, that is great advice about screwing the new plug in by hand as far as possible. I cross-threaded a plug and forced it with a socket in an aluminum head once. Had to have the thing re-tapped, and probably got chucks of stuff into the cylinder. Coat 'em with anti-sieze, and screw 'em in gently! Just use the socket or torque wrench to snug them up.


I learned 30 years ago about changing plugs in aluminum headed motorcycles. Its always wise to use some antisieze cream on the plug threads when installing them and the best tool I found for this process is to use an older stiff PVC hose about 10" long with a 90 degree bend in the end. I loosen up the plugs with a socket then I push the rubber hose over the plug and unscrew it by hand. I reverse this process when installing new plugs. The hose is stiff anough to hold the plug tightly while you are threading it into the motor yet flexible enough to bend around the tight angles to allow you to get the plug started in the head. All I have to use the socket for is to tighten it.
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby velocanman » Apr 17 2012, 3:05am

Two things I'd like to add from my experience. I just changed the plugs on my 2006 Z71, so this is fresh in my mind:

1. Use an old spark plug boot to hand-thread the spark plugs. You will NEVER cross-thread one this way because the boot will just spin on the plug. I credit my dad who is a heavy equipment mechanic for this one. BTW, I am pretty sure the old plug boot I am using is from my 1972 Chevelle back in the 80s.

2. Use dielectric grease on the plugs to keep the boots from sticking to the plug. Whoever changes the plugs in 5+ years or 100,000 miles will thank you. :)
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby drwilkins3 » Jul 04 2012, 6:42pm

Nice write up, I need to do this.
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby scooter2008 » Jul 10 2012, 4:50am

I"m glad this includes the kid in the tool box...lol too true!
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby toolsinbox » Nov 28 2012, 5:49am

I would not use anything on the threads for any sparkplug. If you do it will interfere with the cooling of the plug. The sparkplug relys on metal to metal contact to properly sink the heat out of the plug.
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby lzn197 » Nov 28 2012, 8:15pm

Not true. The is what the flat and tapered seat is for. I worked in AC Spark Plug Engineering. You have MORE danger from insufficient torque. Have you ever tried to remove a Spark Plug from an aluminum head after it has been in there for 100,000 miles?
That is why OEM Spark Plugs have a coating on them if the product goes into a aluminum head. It's not a goop you can see, just a very light coating and it's clear.
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby JCunningham » Nov 28 2012, 8:23pm

lzn197 wrote:Not true. The is what the flat and tapered seat is for. I worked in AC Spark Plug Engineering. You have MORE danger from insufficient torque. Have you ever tried to remove a Spark Plug from an aluminum head after it has been in there for 100,000 miles?
That is why OEM Spark Plugs have a coating on them if the product goes into a aluminum head. It's not a goop you can see, just a very light coating and it's clear.

so we dont need to take the oem plugs out of our new trucks and put anti seize on them?
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Re: How to Replace the Spark Plugs on a Silverado/Sierra

Postby lzn197 » Nov 28 2012, 8:25pm

If you remove them then yes you do! Most of the original coating will be rubbed off when you remove them.
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