NGK Spark Plug - BR5HS - 3722

NGK BR5HS (3722) - Standard Spark Plug / Sparkplug - 5kOhm Resistor. This spark plug is a premium ...

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Product Information

Full details

The NGK BR5HS (3722) standard spark plug is designed for vehicle owners and mechanics seeking a reliable, high-quality replacement to maintain consistent engine ignition. It features a built-in 5kOhm resistor to ensure smooth vehicle operation and stable performance; however, users must verify engine compatibility and ensure the pre-set gap meets their specific vehicle requirements before installation.

All features

Model Part Number	NGK-BR5HS
Brand	NGK

Extended Product Information

FAQs

What is the pre-set gap for this spark plug?

The NGK BR5HS (3722) comes with a pre-set gap of 0.024 inches.

Does this spark plug include a resistor?

Yes, this model includes a built-in 5kOhm resistor to reduce electromagnetic interference.

How many plugs are included in one order?

Each order includes one individual spark plug.

How do I know if this plug is compatible with my vehicle?

You should check your vehicle’s owner manual or service guide for the recommended spark plug part number or heat range.

Should I apply anti-seize to the threads?

NGK generally recommends installing plugs dry as they feature a trivalent plating that provides anti-seize properties; consult your engine's service manual for specific preferences.

What does the 3722 stock number indicate?

The 3722 is the specific NGK stock number used to identify this exact plug variant for inventory and matching purposes.

Troubleshooting

Engine fails to start after installation

Verify the spark plug wire is securely attached and that the plug is tightened correctly to ground the electrical circuit.

Engine misfiring or running rough

Check that the spark plug gap is set to the manufacturer's specification and inspect the ignition coil or spark plug lead for signs of wear.

Plug fouling prematurely

Ensure the air-fuel mixture is correct and that the air filter is clean, as a rich fuel mixture can cause carbon buildup on the plug electrode.

Pros and Cons

Pros

Integrated 5kOhm resistor for electronic stability
High-quality construction from a trusted industry brand
Reliable ignition performance helps prevent misfires
Standardized part number (3722) ensures easy identification

Cons

Not suitable for engines requiring different heat ranges
Requires manual gap verification for specific high-performance applications
Sold as a single unit, requiring individual purchase for multi-cylinder engines

Setup, Compatibility & Care

Before installing the NGK BR5HS (3722), verify that your vehicle manual or engine documentation specifically lists this part number. Compatibility is paramount to preventing engine damage.

Preparation: Ensure the engine is completely cool before removing the old spark plug to prevent damage to the cylinder head threads.
Installation: Remove the old plug and inspect the ignition wire or coil boot for damage. Thread the new BR5HS plug in by hand first to ensure it is not cross-threaded, then use a torque wrench to tighten to the manufacturer's specified setting.
Gap Verification: While the plug comes with a pre-set gap of 0.024, always use a spark plug gapping tool to confirm the measurement matches your specific engine’s service manual requirements.
Care: Keep the engine area free of debris and dirt to prevent contaminants from entering the combustion chamber when the plug is removed.