2022 Chevrolet Suburban Spark Plug Type, Gap & Torque Specs

As an ASE-certified master technician, I’ve seen my fair share of misfires, rough idles, and poor fuel economy traced back to a single overlooked maintenance item: spark plugs. For a heavy-duty family hauler like the 2022 Chevrolet Suburban, keeping the ignition system in peak condition is vital for maximizing the efficiency and power of its robust V8 engines.

(Note: The 2022 Suburban is also available with the 3.0L Duramax diesel engine. Since diesel engines use glow plugs instead of spark plugs to ignite fuel via compression, this guide strictly covers the 5.3L and 6.2L V8 gasoline engines).

Quick reference

Why the right plug matters

Modern engines like the General Motors EcoTec3 5.3L and 6.2L V8 rely on precise ignition timing and spark intensity to run efficiently. Choosing the correct spark plug involves two main factors: heat range and electrode material.

Electrode Metal: For the 2022 Suburban, OEM plugs are Iridium. Iridium is significantly harder and more durable than platinum or traditional copper. While copper provides excellent conductivity, it wears out in just 20,000 miles. Iridium plugs, on the other hand, maintain a sharp electrode edge for nearly 100,000 miles, ensuring a consistent spark that won't degrade your fuel economy over time.

Heat Range: The heat range determines how quickly the spark plug dissipates heat into the cylinder head. If you use a plug that is too "hot," you risk pre-ignition (engine knock) and melted electrodes. Too "cold," and the plug will foul with carbon deposits. Always stick to the factory heat range specified by ACDelco, NGK, or Denso for these engines.

How to gap a spark plug

Although modern iridium spark plugs for the Suburban come pre-gapped from the factory at approximately 0.040", it is standard technician practice to verify the gap before installation. Plugs can easily be dropped or bumped during shipping, closing the gap.

1. Use the right tool: For precious metals like iridium, avoid traditional "coin-style" gapping tools, as they can easily snap the brittle, fine-wire center electrode. Use a wire-style feeler gauge instead.
2. Check the gap: Gently slide the 0.040" wire between the center and ground electrode. It should pass through with a slight "drag."
3. Adjust carefully: If the gap is too tight, use the bending tool on your gauge to lightly bend the ground strap away from the center electrode. Never pry against the iridium tip itself.

Replacement procedure tips

Servicing the spark plugs on the 2022 Suburban is relatively straightforward thanks to the accessible overhead-valve V8 layout, but there are a few modern best practices to follow.

• Coil-on-Plug (Coil-Near-Plug) System: The EcoTec3 V8s use a coil-near-plug design with a short spark plug wire bridging the coil pack and the plug. When removing the wire boots, twist them gently back and forth before pulling to avoid tearing the internal silicone.
• The Anti-Seize Debate: General Motors and most premium spark plug manufacturers (like NGK and ACDelco) advise against using anti-seize compound on the threads. Modern plugs feature a special zinc or nickel coating designed to prevent seizing. Adding anti-seize acts as a lubricant, which can easily cause you to over-torque the plug and damage the cylinder head threads.
• Dielectric Grease: Apply a small dab of dielectric grease to the inside of the spark plug wire boot before reinstalling it. This prevents moisture intrusion, stops high-voltage tracking (misfires), and makes the boot much easier to remove next time.

Known issues

While the 2022 Suburban doesn't suffer from the infamous multi-piece spark plug breakage issues seen in early 2000s Ford 3-valve engines, there are GM-specific quirks to watch out for.

The 5.3L and 6.2L engines utilize Dynamic Fuel Management (DFM) and an advanced ignition coil system that uses the spark plug itself to measure ionization in the cylinder to detect misfires and combustion quality. If you use a cheap copper plug or a non-OEM equivalent, the altered electrical resistance can disrupt this ionization sensing, triggering false misfire codes (P0300) and causing the DFM system to behave erratically. Stick strictly to the OEM ACDelco 41-114 or direct premium equivalents to keep the engine computer happy.

Additionally, the passenger-side rear plug (cylinder 8) is notoriously tight against the firewall. Use a combination of a short extension and a swivel socket to access it without cracking the porcelain insulator.

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