1. Key point of spark plug

The spark plug is a critical component of an internal combustion engine's ignition system, directly affecting combustion efficiency, power output, and emission levels. Utilizing cutting-edge domestic technology, modern spark plugs feature precision engineering and advanced materials, consisting of the following key components：Center Electrode，Ground Electrode，Insulator Ceramic，Metal Shell，Sealing Gasket & Resistor. With breakthroughs in material science, precision machining, and smart manufacturing, China-made spark plugs now rank among the world's best, delivering reliable ignition solutions for high-performance engines.

2. Torch different type of spark plug

Torch has six categories of spark plug: Nickel Alloy, Single Platinum, Single ridium, Double Platinum, Double lridium and lridium Platinum, The complete variety can be adapted to most of the world's mass-produced brand cars.

3. Performance of different material of spark plug

4. Torch loading and customer feedback

5.Common causes of automotive spark plug failure

• Normal Wear & Erosion : Electrodes gradually wear down over time due to repeated sparking, leading to increased gap size and weak ignition.

• Carbon Fouling (Deposits): Caused by incomplete combustion, oil leakage, or rich fuel mixtures, leading to soot buildup that shorts the spark.

• Oil Fouling: Engine oil leaking into the combustion chamber (worn piston rings/valve seals) coats the spark plug, preventing proper sparking.

• Overheating: Excessive heat (lean fuel mixture, incorrect heat range, or engine overheating) can melt electrodes or crack the insulator.

• Pre-Ignition/Detonation: Abnormal combustion (hot spots, low-octane fuel, or advanced timing) causes extreme pressure and heat, damaging electrodes.

• Gap Bridging: Combustion deposits or metallic particles can bridge the electrode gap, short-circuiting the spark.

• Mechanical Damage: Improper installation (over-tightening, cross-threading) or impact can crack the insulator or bend electrodes.

• Fuel Additive Buildup: Low-quality fuel or additives may leave conductive deposits, causing misfires.

• Incorrect Heat Range: Too hot (causing pre-ignition) or too cold (leading to fouling) for the engine’s operating conditions.

• Electrical Issues: Weak ignition coils, faulty wires, or incorrect voltage can cause weak or intermittent sparks, accelerating wear.

Regular inspection and using the correct spark plug type can prevent most failures.

6. Spark Plug Inspection and Maintenance

A. Visual Inspection

• Electrode Wear: Check for excessive erosion or rounded edges. Replace if the gap is too wide or electrodes are damaged.

• Deposits: Look for carbon buildup (black soot), oil fouling (wet/oily coating), or ash deposits. Clean or replace as needed.

• Cracks/Damage: Inspect the ceramic insulator and metal shell for cracks or physical damage.

B. Gap Measurement & Adjustment

• Use a feeler gauge or wire-type gap tool to measure the electrode gap. Adjust to the manufacturer’s specification if necessary.

• Avoid prying the center electrode—use a proper gapping tool to prevent damage.

C. Cleaning (If Reusable)

• Remove light carbon deposits with a wire brush or specialized spark plug cleaner.

• Avoid abrasive methods that could damage the electrodes.

D. Torque Check During Installation

• Install with a torque wrench to prevent under/over-tightening (refer to the vehicle’s manual).

• Apply a small amount of anti-seize compound (if recommended) to the threads to prevent seizing.

E. Testing for Spark (If Misfiring)

• Use a spark tester or perform a ground test (while cranking) to confirm strong spark.

• Weak/no spark may indicate ignition coil or wiring issues.

F. Replacement Interval

• Follow the manufacturer’s recommended schedule (typically 30,000–100,000 miles, depending on plug type).

• Copper plugs wear faster (~30k miles), while iridium/platinum plugs last longer (~60k–100k miles).

Pro Tip: Always inspect spark plugs during routine tune-ups to ensure optimal engine performance and fuel efficiency.

7. Tips for successfully replacing spark plug

✔ Replace one plug at a time to avoid mixing up ignition wires.
✔ Never over-tighten—this can crack the ceramic or damage threads.
✔ Use Torch spark plugs which has original quality.