2016 Chevrolet Silverado 1500 Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2016 Chevrolet Silverado 1500 is crucial for optimal engine performance, fuel efficiency, and longevity. The spark plug is responsible for igniting the air-fuel mixture in your engine's cylinders, and an incorrect plug can lead to a host of problems, from misfires and reduced power to catalytic converter damage.

Key considerations include:

• Heat Range: Spark plugs are designed with a specific "heat range," which refers to their ability to dissipate heat. A plug that runs too hot can cause pre-ignition (where the fuel ignites before the spark), leading to engine knock and potential damage. A plug that runs too cold can lead to fouling, where carbon deposits build up on the plug, preventing a strong spark. Your Silverado's engine is designed for a specific heat range, and using a plug outside of this range can negatively impact performance.

• Electrode Metal: Spark plugs come with different electrode materials, each offering distinct advantages:

  • Iridium: This is the most common and recommended type for your 2016 Silverado. Iridium is extremely durable and has a very high melting point, allowing for very fine electrodes that produce a strong, consistent spark for extended periods. They offer excellent performance and a long service life, typically lasting 97,500 miles.

  • Platinum: Platinum plugs are also durable and offer good performance, often lasting longer than copper plugs. They are a good step up from copper but generally don't match the longevity or ultimate performance of iridium.

  • Copper: While copper plugs offer excellent conductivity, they are less durable than iridium or platinum. They tend to wear out faster, requiring more frequent replacement, and are generally not recommended for modern engines like those in the 2016 Silverado 1500, which are designed for longer-lasting, finer-electrode plugs.

How to gap a spark plug

The spark plug gap is the distance between the center and ground electrodes. An incorrect gap can lead to an inconsistent spark and poor combustion. While ACDelco (and most aftermarket) iridium spark plugs for your 2016 Silverado are typically pre-gapped from the factory, it's always a good idea to double-check the gap before installation.

To gap a spark plug, you'll need a wire-type spark plug gapping tool. Avoid using a ramp-style "coin" gapping tool on iridium or platinum plugs, as they can damage the fine electrode tip. Gently slide the appropriate wire gauge into the gap. If adjustment is needed, very carefully bend the ground electrode only. Never bend the center electrode. A slight bend is all that's usually required. Once the gauge slides in with a slight drag, the gap is correct.

Replacement procedure tips for your 2016 Chevrolet Silverado 1500

Replacing spark plugs on your 2016 Silverado 1500 is a manageable DIY task, but a few tips can make the process smoother:

• Coil-on-Plug Removal: Your Silverado utilizes a coil-on-plug (COP) ignition system, meaning each spark plug has its own ignition coil mounted directly on top. To access the spark plugs, you'll need to disconnect the electrical connector from each coil pack and then remove the bolt holding the coil pack in place. The coil pack can then be pulled straight up and off the spark plug.

• Anti-Seize Debate: There's an ongoing debate about using anti-seize on spark plug threads. For spark plugs with nickel-plated shells, like the factory ACDelco plugs, anti-seize is generally not recommended. The nickel plating acts as a natural anti-seize, and applying additional anti-seize can lead to over-torquing, which can damage the cylinder head threads or even distort the spark plug, affecting its heat range. Refer to the spark plug manufacturer's recommendations. If you choose to use anti-seize on non-plated plugs, reduce the torque specification by approximately 20%.

• Dielectric Grease on Boots: It's good practice to apply a small amount of dielectric grease inside the spark plug boot (the part of the coil pack that connects to the spark plug). This helps to seal out moisture, prevents corrosion, and makes future removal easier. Be careful not to get dielectric grease on the actual electrode of the spark plug.

• One at a Time: To avoid mixing up spark plug wires or coil packs, replace the spark plugs one at a time. Remove one coil pack, remove the old plug, install the new plug, reinstall the coil pack, and then move to the next cylinder.

• Tightening: Always use a torque wrench to tighten your new spark plugs to the specified torque of 11 lb-ft (15 Nm). Over-tightening can strip cylinder head threads, and under-tightening can lead to blown-out plugs or poor electrical contact.

Known issues (not applicable)

Fortunately, the 2016 Chevrolet Silverado 1500 engine families (4.3L LV3 V6, 5.3L L83 V8, and 6.2L L86 V8) do not have widespread, notorious spark plug-related issues like the Ford 5.4L 3-valve engine's propensity for two-piece spark plug breakage. These GM engines are generally robust in this regard, especially when maintained with the correct spark plugs at the recommended intervals.

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