2017 Chevrolet Equinox Spark Plug Type & Gap

Quick reference

Why the right plug matters

For your 2017 Chevrolet Equinox, selecting the correct spark plug is crucial for optimal engine performance, fuel efficiency, and longevity. The "right" plug isn't just about fitment; it's about heat range, electrode material, and proper gapping.

Heat Range: Spark plugs are designed with a specific heat range, which dictates how quickly the plug dissipates heat from its tip. An incorrect heat range can lead to pre-ignition (plug too hot, causing fuel to ignite prematurely) or fouling (plug too cold, leading to carbon deposits). Modern engines like those in your Equinox are precisely tuned for a specific heat range, so sticking to the OEM-specified plug or its direct aftermarket equivalent is non-negotiable.

Electrode Metal: The 2017 Equinox primarily uses iridium spark plugs as original equipment, and for good reason:

• Iridium: This is the go-to for modern high-performance and long-life applications. Iridium is incredibly hard and has a very high melting point, allowing for ultra-fine electrodes that produce a strong, focused spark. This design minimizes voltage requirements, improves fuel efficiency, and offers exceptional durability, leading to extended replacement intervals of 100,000 miles or more. Both the ACDelco 41-109 and its NGK/Denso equivalents are iridium-tipped.
• Platinum: While not standard for your Equinox, platinum plugs offer good durability (typically 60,000-100,000 miles) and are often found in OEM applications for older vehicles. They use a platinum pad on the center and/or ground electrodes to resist wear.
• Copper: Copper plugs boast excellent conductivity but are much softer and wear out quickly. You'd typically find these in older, carbureted engines or high-performance, forced-induction applications where frequent changes are part of the maintenance schedule. They are not suitable for your 2017 Equinox and would lead to rapid wear and misfires.

How to gap a spark plug

While many iridium spark plugs come "pre-gapped" from the factory, it is always a good practice to verify the gap, especially since shipping and handling can sometimes cause slight variations. However, due to the delicate nature of iridium fine-wire electrodes, extreme caution is advised, and it's generally recommended NOT to adjust the gap on fine-wire iridium plugs unless absolutely necessary and with the proper tools. If the gap is significantly off, it's often better to replace the plug than risk damaging the fragile electrode.

If you must check:

1. Use a wire-type gap gauge: These are generally preferred over ramp-style gauges for fine-wire plugs as they are less likely to damage the delicate electrode. Slide the correct size wire between the center and ground electrodes.
2. Gentle adjustment (if needed): If the gap is slightly off and you have determined adjustment is necessary, use a spark plug gapping tool that allows you to lightly bend the ground electrode only. NEVER pry or bend against the center electrode as this will almost certainly damage the iridium tip and render the plug useless. Work slowly and in small increments.

For your 2017 Equinox, the specified gap is 0.040 inches (1.0 mm).

Replacement procedure tips

Replacing spark plugs on your 2017 Chevrolet Equinox is a moderately involved DIY task. Here are some specific tips:

• Coil-on-Plug (COP) Removal: Both the 2.4L I4 and 3.6L V6 engines use a coil-on-plug ignition system. This means each spark plug has its own ignition coil mounted directly above it. To access the plugs:
  • Carefully disconnect the electrical connector from each coil. Press the tab and gently pull. Avoid yanking on the wires.
  • Remove the bolt securing each coil to the valve cover (typically a 10mm bolt).
  • Gently twist and pull the coil straight up to remove it. If it's stubborn, work it back and forth slightly. Avoid excessive force.
• Anti-Seize Debate: For spark plugs going into aluminum cylinder heads (which your Equinox has), there's a long-standing debate about using anti-seize. Many spark plug manufacturers, including NGK and Denso, advise against using anti-seize on modern nickel-plated spark plugs. They claim the nickel plating provides sufficient anti-seize properties and that applying additional anti-seize can alter the torque readings, leading to over-tightening and potential plug breakage or cylinder head damage. However, some technicians still prefer a very thin coat. If you choose to use anti-seize, apply only a tiny amount to the threads (avoiding the electrode) and reduce your torque value by approximately 10-20% to compensate. Our recommendation follows the plug manufacturers: for nickel-plated plugs, install dry and torque to spec.
• Dielectric Grease on Boots: Before re-installing the coil packs onto the new plugs, apply a small amount of dielectric grease inside the rubber boot of each coil. This helps prevent moisture intrusion, insulates against voltage leaks, and makes future removal easier.
• Torque Wrench is Crucial: Always use a calibrated torque wrench. Over-tightening can strip threads in the aluminum cylinder head or damage the spark plug, while under-tightening can lead to combustion gas leaks and misfires. The specified torque for both engines is 18 lb-ft (24 Nm).

Known issues

Fortunately, the 2.4L I4 and 3.6L V6 engines in the 2017 Chevrolet Equinox do not have widespread, notorious spark plug-related issues akin to the Ford 3-valve two-piece spark plug breakage or GM 5.3L ionization-sensing coil problems where specific plug types are critical.

However, general issues to watch for include:

• Oil Leaks into Plug Wells: On higher mileage examples, valve cover gasket leaks can allow oil to seep into the spark plug wells. This can foul the spark plugs and damage the coil packs. If you find oil in the plug wells during replacement, addressing the valve cover gasket leak is essential.
• Misfire Codes (P030X): If you experience a misfire (rough idle, loss of power, check engine light flashing), a faulty spark plug or coil pack is often the culprit. Replacing worn plugs is your first step in diagnosing these issues.

Need plugs replaced? Find a shop on Repairius.