2022 GMC Sierra 1500 Spark Plug Specs & Replacement Guide

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2022 GMC Sierra 1500 is crucial for optimal engine performance, fuel efficiency, and longevity. Spark plugs are not "one size fits all." Key factors to consider include heat range and electrode material.

Heat Range: The heat range refers to the spark plug's ability to dissipate heat from the combustion chamber. A "hotter" plug retains more heat, while a "colder" plug dissipates more. An incorrect heat range can lead to pre-ignition (if too hot) or fouling (if too cold), both of which can severely impact engine health.

Electrode Metal:

• Iridium: Most modern vehicles, including the V8 engines in the 2022 Sierra, use iridium spark plugs. Iridium is extremely durable, allowing for very fine electrodes that produce a strong, consistent spark for much longer intervals. This contributes to better fuel economy and reduced emissions over the life of the plug.
• Platinum: Platinum plugs offer good durability, typically lasting longer than copper plugs. They are a step up from copper but generally not as long-lasting or efficient as iridium.
• Copper: Copper plugs have a large copper core that is excellent for conductivity but wears faster. They were common in older vehicles and are sometimes used in high-performance applications where frequent changes are acceptable.

For your 2022 Sierra 1500, stick with the iridium-tipped ACDelco plugs specified by the manufacturer, or their direct iridium aftermarket equivalents.

How to gap a spark plug

While most modern iridium spark plugs come pre-gapped from the factory, it's always a good practice to double-check the gap before installation. An incorrect gap can lead to misfires, reduced fuel economy, and poor engine performance.

To gap a spark plug:

1. Use the correct tool: Only use a wire-type spark plug gapping tool. Never use a disc-style gapper, as it can damage the delicate iridium tip. The wire gauge will accurately measure the distance between the center and ground electrodes.
2. Measure the gap: Carefully slide the appropriate wire gauge through the gap. There should be a slight drag.
3. Adjust if necessary: If the gap is too small, gently pry open the ground electrode with the gapping tool's adjustment feature. If the gap is too wide, carefully tap the ground electrode on a hard, non-abrasive surface to close it slightly. Make very small adjustments to avoid damaging the electrode.
4. Re-measure: Always re-measure after any adjustments to ensure accuracy.

Replacement procedure tips

Replacing spark plugs on your 2022 GMC Sierra 1500 will involve handling coil-on-plug ignition systems. Here are some tips:

• Coil-on-Plug Removal: Each spark plug has its own ignition coil directly mounted on top of it. Carefully disconnect the electrical connector by depressing the release tab and pulling. Then, gently twist and pull the coil straight up to remove it from the spark plug well. Avoid yanking on the wires.
• Inspection: Before inserting the new plug, inspect the spark plug well for any debris. Use compressed air to clear any foreign material to prevent it from falling into the combustion chamber.
• Anti-Seize Debate: Some manufacturers, including GM, advise against using anti-seize on spark plug threads, especially with nickel-plated plugs, as it can alter torque readings and potentially lead to overtightening. The factory plugs usually have a special coating that serves this purpose. If you choose to use anti-seize, apply a very thin amount only to the threads, avoiding the electrode, and reduce the torque specification by approximately 15-20%.
• Dielectric Grease on Boots: A small amount of dielectric grease applied to the inside of the ignition coil boot (where it contacts the ceramic of the spark plug) can help prevent moisture intrusion and make future removals easier. Be careful not to get grease on the electrical contacts of the coil or the spark plug electrodes.
• Torque Wrench is Crucial: Always use a calibrated torque wrench for installation. Overtightening can damage the spark plug threads in the cylinder head, which is an expensive repair. Undertightening can lead to plugs vibrating loose, causing misfires or even ejection from the engine.

Known issues

Fortunately, the 2022 GMC Sierra 1500 engines (2.7L L3B, 5.3L L84/L82, 6.2L L87) do not have widespread, notorious spark plug-related issues akin to the Ford 3-valve 2-piece plug breakage. The coil-on-plug design is robust, and the ionization-sensing technology in GM's modern engines (especially the V8s) helps monitor combustion for optimal performance and can detect early signs of misfires.

Need plugs replaced? Find a shop on Repairius.