NGK V-Power Spark Plug Box of 4 (TR4)

High-Temperature Copper Spark Plugs with V-Groove Electrode for Consistent Ignition

The NGK TR4 is a V-Power copper spark plug engineered for engines that require a projected-tip, resistor-type plug at heat range 4. The V-groove machined into the ground electrode of NGK3754 focuses the spark arc at a precise contact point, reducing firing voltage demands and supporting clean combustion across the RPM range. Each box contains four plugs for a single-bank service on most 4-cylinder applications.

Key Features

• V-groove ground electrode focuses the spark arc for consistent ignition
• Projected-tip design positions the spark closer to the center of the combustion chamber
• Copper core center electrode manages heat dissipation across varying load conditions
• Resistor construction suppresses electromagnetic interference with vehicle electronics
• Corrugated insulator ribs prevent voltage flashover and leakage
• Triple-gasket seal prevents combustion gas from escaping past the plug shell
• Box of 4 covers a full plug replacement on most 4-cylinder engines

Specifications

What's Included

• 4x NGK TR4 V-Power Spark Plugs

About NGK

Founded in 1936, NGK Spark Plugs is the global leader in OEM ignition components, supplying spark plugs to virtually every major automaker. Their V-Power line uses a patented V-groove ground electrode to lower required firing voltage and maintain ignition stability across high and low RPM conditions, making it an ideal replacement for applications where iridium or platinum is not required.

Frequently Asked Questions

The TR4 fits a wide variety of import and domestic engines requiring a projected-tip copper plug at heat range 4. Cross-reference your OEM plug number against NGK3754 using the official NGK fitment guide with your year, make, model, and engine displacement to confirm compatibility before ordering.

Heat range 4 refers to a cooler-running plug relative to a heat range 5 or 6. A lower number dissipates heat from the plug tip faster, which is appropriate for higher-RPM or slightly higher-compression naturally aspirated engines. Using the wrong heat range can cause fouling or pre-ignition.

The NGK3754 ships from the factory with a preset gap. Verify the gap against your vehicle's specification using a wire feeler gauge before installation, and adjust if your application requires a different setting from the default.

NGK copper V-Power plugs are designed for approximately 20,000 to 30,000 mile service intervals under normal operating conditions. Check your vehicle manufacturer's replacement schedule, and inspect plugs periodically if the vehicle sees hard use or oil consumption.

The TR4 at heat range 4 is on the cooler side of the standard copper range, which can be acceptable on mildly boosted applications. For heavily modified or high-boost setups, consult your tuner to confirm the correct heat range before selecting a plug.

Each box contains 4 plugs. A complete 4-cylinder replacement requires 4 plugs, so one box handles a full service. A 6-cylinder requires 6 plugs and a V8 requires 8 plugs, so order additional boxes accordingly for your engine configuration.

Yes. TR4 is the alphanumeric heat range and electrode design designation, and NGK3754 is the numeric catalog reference. Both identifiers refer to the same plug and can be used interchangeably when cross-referencing or ordering.

If aged or fouled spark plugs are the cause, fresh NGK3754 V-Power plugs can restore consistent ignition and smooth idle. Always diagnose the root cause of a misfire before replacing plugs, as ignition coils, injectors, and compression issues can produce similar symptoms.

Installation Instructions

1. Allow the engine to cool completely before beginning spark plug removal.
2. Disconnect the ignition coil or spark plug wire from the cylinder being serviced.
3. Remove the existing plug counterclockwise with a spark plug socket and rubber insert.
4. Verify the gap on each NGK TR4 against your vehicle's specification using a feeler gauge.
5. Thread the plug in by hand until snug, then torque to the manufacturer's specification.
6. Reconnect the coil or wire and repeat for remaining cylinders.
7. Start the engine and confirm smooth idle without misfire codes.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.