2021 Chevrolet Equinox Spark Plug Type & Gap

Quick reference

Why the right plug matters

Spark plugs are a small but mighty component in your engine's ignition system. They provide the spark that ignites the air-fuel mixture, powering your vehicle. Using the wrong spark plug can lead to a host of problems, including reduced fuel economy, misfires, poor acceleration, and even engine damage.

Several factors make a spark plug "right" for your engine:

• Heat Range: This refers to the plug's ability to dissipate heat. A "hot" plug retains more heat, while a "cold" plug dissipates it quickly. Modern engines, like those in the 2021 Equinox, require precise heat ranges to prevent pre-ignition (where the fuel ignites before the spark) or fouling (where carbon deposits build up on the plug). The OEM plugs are carefully chosen for the specific heat characteristics of your engine.

• Electrode Metal:

  • Iridium: This is the most common and longest-lasting electrode material in modern vehicles. Iridium plugs offer superior durability and a finer electrode tip, leading to a more consistent and powerful spark. They are standard in the 2021 Equinox and are designed for extended service intervals.
  • Platinum: Platinum plugs also offer excellent durability and a longer lifespan than copper. They were a popular choice before iridium became widespread.
  • Copper: While copper is an excellent conductor, copper-tipped plugs wear out much faster due to the softer metal. They are generally found in older vehicles or specific high-performance applications where frequent changes are acceptable.

How to gap a spark plug

While many modern iridium spark plugs come pre-gapped from the factory, it's always a good idea to double-check the gap before installation, especially if you're using an aftermarket plug. The gap is the distance between the center and ground electrodes. An incorrect gap can lead to misfires and inefficient combustion.

To gap a spark plug:

1. Use the Right Tool: A wire-type feeler gauge is ideal for iridium and platinum plugs. Avoid using coin-style gapping tools, as they can damage the fine electrode tip.
2. Measure Carefully: Slide the appropriate wire gauge between the electrodes. It should have a slight drag.
3. Adjust (if necessary): If the gap needs adjustment, gently bend the ground electrode. For a wider gap, use the gapping tool to lightly pry the ground electrode away from the center electrode. For a narrower gap, gently tap the ground electrode on a clean, hard surface. Never bend or apply pressure to the center electrode, as this can damage the plug.

Replacement procedure tips

The 2021 Chevrolet Equinox uses a coil-on-plug (COP) ignition system. This means each spark plug has its own individual ignition coil mounted directly above it. This design eliminates spark plug wires, reducing potential points of failure.

Here are some tips for replacing spark plugs on your Equinox:

• Cool Engine: Always allow the engine to cool completely before attempting spark plug removal or installation. Working on a hot engine can increase the risk of damaging the cylinder head threads or burning yourself.
• Coil Pack Removal: Carefully disconnect the electrical connector from each coil pack, then remove the bolt(s) securing the coil pack. Gently twist and pull upwards to remove the coil pack from the spark plug well. Inspect the coil boots for cracks or signs of deterioration.
• Anti-Seize Debate: There's ongoing debate about the use of anti-seize on spark plug threads. Most modern spark plugs have a special coating on the threads that acts as an anti-seize. Applying additional anti-seize can alter the torque readings, potentially leading to over-tightening and damage. Follow the spark plug manufacturer's recommendations. If they don't recommend it, it's best to skip it.
• Dielectric Grease: Apply a small amount of dielectric grease to the inside of the spark plug boots (the part that connects to the top of 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 spark plug electrodes.
• Torque Wrench is Crucial: Always use a torque wrench to tighten spark plugs to the specified torque. Over-tightening can strip the threads in the cylinder head, which is an expensive repair. Under-tightening can lead to compression leaks and misfires. The specified torque for the 2021 Equinox is 18 lb-ft (24 Nm).

Known issues

Fortunately, there are no widespread, commonly known issues with spark plugs or their removal/installation in the 2021 Chevrolet Equinox. Unlike some past Ford 3-valve engines with their notorious 2-piece spark plugs prone to breakage, the Equinox's design is straightforward.

Need plugs replaced? Find a shop on Repairius.