Spark Plugs and Wires Replacement/Upgrade

Darksky · June 6, 2019

(I searched the forum to no good answer)

My 2015 CCSB 4WD Silverado 1500 L86 6.2L has about 65,000 miles on the clock. I’m considering replacing the spark plugs and wires during my next maintenance day. It is not missing, but the idle isn’t as smooth as it has been, it might have a tiny pause upon acceleration. I’m pretty conscientious regarding maintenance and have serviced the intake/fuel system regularly, so this seems like a logical progression in scheduled maintenance. No big engine mods done, intake and a muffler is about all.

1. Is it appropriate at this mileage and hours/age?

2. Which products have you used and why.

3. Costs and potential bargains.

4. Tips or Tricks to make the process easier or provide a better outcome.

thanks for your input and sharing your experience. If you recommend parts, try and include parts numbers.

Thank you, Dark.

KARNUT · June 6, 2019

In my working years the last time I changed plugs was 1994. I would trade every 2- 21/2 years usually 150K miles. My longest was 2004 Z71 at 180K, needing no change. With that kind of service I would go OEM.

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CamGTP · June 6, 2019

Stick with the OEM AC Delco plugs, no reason to change it up. I think the part number is like 41-114. Any parts store can look up the OEM plug option and you can verify it too on various websites. Should be around $7-9 per plug.

With that low of mileage I wouldn't even replace the wires but that is just me, I'd clean the ends and put new dielectric grease for good measure.

It's not a hard job at all, just takes time. The back two cylinders on each head can take the most time because of how far you need to reach.

FlipZ71 · June 6, 2019

I found it to be easier well liner removed... came in from side ...

RMR · June 6, 2019

I changed mine at 28K. Way early I know. But I don't wait until 40K to change my 40K tires either. I like things to be closer to optimum. I also went with the Taylor 10mm fatty plug wires. Mostly for looks. But I did notice a minuscule improvement in throttle response off idle. I get bored ;)

Darksky · June 7, 2019

Which set of wires? 409?

JONBLARC7 · June 7, 2019

Remove the fender liner makes it so much easier.

RMR · June 7, 2019

409. Had to shed the aluminum shields and springs. But no longer needed.

Snowcamo · June 7, 2019

Denso iridium plugs and Denso wires here.

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FL335i · June 9, 2019

I just replaced the factory plugs in my '14 yesterday at 97,200 miles. They still had a good gap of .040". But they needed replaced. I went with a Denso Twin Tip Iridium plugs. The truck runs a lot better and smoother. I mainly notice it when driving in heavy traffic. I wish I changed them out earlier. I should have done a 75k internal. But then again my truck has seen heavy city commuting daily in the heat, tons of idling on construction sites for hours on end with the a/c, towing etc. It's basically been used in a commercial vehicle sense. The past few months my MPG has gotten unusually worse on my work route. So far with the new plugs my MPG is back up to where it should be. So I don't buy this 100k mile business. I had a 2009 Lincoln MKZ with the V6, which also showed 100k plug interval.... again, heavy use for work, and I had to replace them at 70k because the car would not start on the first crank in the early mornings when cold. After the plug change the car ran perfect up to 100k when I sold it. These 100k intervals are for a vehicle on rollers in a lab, or ideal conditions, not a 1.5hr 25 mile commute in 100*F weather everyday, or idling hours on end like a wood stove with the a/c on. It was $56, change the plugs.