S5 474Z-18-100

Brand: Haima

Model: S5

Part Number: 474Z-18-100

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Product Details

Haima S5 Ignition Coil – Part No.: 474Z-18-100

Let’s keep it simple—this isn’t just a “small electrical part” in your Haima S5’s engine bay. It’s the power converter that makes your engine start and run smoothly: a durable, heat-resistant unit made of high-grade plastic housing (protects internal components) + copper or aluminum wire windings (conducts electricity) + sealed electrical connectors. Mounted directly on the Haima S5’s engine cylinder head—one per cylinder, connected to the spark plugs and engine control unit (ECU)—it acts like a “voltage booster.” Without it, the car’s 12V battery can’t produce enough power to ignite the fuel-air mixture in the engine, leading to failed starts, rough idling, or reduced power.

This ignition coil is exclusive to Haima S5 (474Z engine)—always check your vehicle’s VIN to confirm fitment! It’s tailored to the S5’s 474Z engine specs: its voltage output (usually 20,000–40,000V) matches the spark plugs’ requirements (ensures strong ignition), its mounting base aligns with the cylinder head’s bolt holes (no wobbling), and its wiring connectors match the S5’s ECU (seamless signal transmission). Grab a generic coil or one for other models? You’ll run into trouble: wrong voltage (either too weak to ignite fuel or too strong to burn out spark plugs), poor fit (vibrates loose), or incompatible wiring (triggers engine fault lights).

1. Core Jobs: Boost Voltage, Ignite Fuel & Stabilize Engine

As a critical part of the S5’s ignition system, it does three key jobs to keep the engine running right:

Convert low voltage to high voltage: The car’s battery supplies 12V—way too weak to ignite the fuel-air mixture. This coil’s internal windings step up the voltage to 20,000–40,000V, sending a powerful electrical spark to the spark plugs.

Trigger fuel combustion: When the ECU sends a signal, the coil releases the high-voltage spark to the spark plug. This spark ignites the fuel-air mixture in the cylinder, creating the explosion that powers the engine.

Ensure consistent performance: It delivers a steady, reliable spark to each cylinder (even under high engine load or temperature). This prevents misfires (unburned fuel), keeps idling smooth, and maintains fuel efficiency—no sputtering or power drops.

This 474Z-18-100 ignition coil only fits Haima S5 with 474Z engine—wrong fit means engine trouble:

Fits These: Haima S5 variants equipped with the 474Z engine (matches cylinder head layout, spark plug type, and ECU wiring—confirm with VIN).

Won’t Fit These:

Other Haima models: Like Haima S7, 7X, or M3—different engine designs (cylinder counts, voltage requirements) mean the coil can’t work.

Non-Haima vehicles: Even if engine size is similar, their ECU protocols and spark plug specs differ (causes misfires or fault codes).

S5 with modified engines: Aftermarket engine upgrades or spark plug swaps change voltage needs—original coil won’t match (reduces performance).

Installation & Upkeep (Pros Recommended—Electrical Precision Matters!)

Installation: Best Done by Certified Technicians

Replacing this coil involves electrical work—DIY risks short circuits or engine damage:

Prep: Let the S5’s engine cool completely, disconnect the battery (to cut power), and locate the ignition coils on the cylinder head (one above each spark plug).

Remove old coil: Techs disconnect the electrical connector from the coil, unbolt it from the cylinder head, and pull it straight up (avoid twisting—prevents damage to spark plug wires).

Install new coil: They press 474Z-18-100 firmly onto the spark plug, bolt it to the cylinder head (tighten to Haima’s torque specs), and reconnect the electrical connector (ensure it clicks into place).

Test: They reconnect the battery, start the engine, and check for smooth idling—no misfires, sputtering, or fault lights (uses diagnostic tools to confirm ECU compatibility).

Maintenance: Easy Checks to Avoid Breakdowns

Inspect every 30,000 km: Look for cracks in the plastic housing, corrosion on connectors, or oil leaks (oil on the coil means a damaged valve cover gasket—fix it to protect the coil).

Replace in sets (if needed): If one coil fails, others may be worn—replacing all at once ensures balanced performance (avoids uneven power between cylinders).

Avoid moisture exposure: Don’t wash the engine bay with high-pressure water (water can seep into connectors and short the coil).

Check spark plugs together: Worn spark plugs strain the ignition coil—replace spark plugs every 40,000–60,000 km to extend coil life.

Summary: Haima S5 Ignition Coil (474Z-18-100)

Exclusive to Haima S5 with 474Z engine (confirm VIN for fitment), this coil is a heat-resistant unit made of high-grade plastic housing, copper/aluminum windings, and sealed electrical connectors. Mounted on the engine cylinder head (one per cylinder), it connects to spark plugs and the ECU, acting as a voltage booster.

Key roles: Convert 12V battery power to 20,000–40,000V for spark plugs to ignite fuel-air mixtures; ensure steady sparks (prevent misfires, maintain smooth idling and fuel efficiency); work with the ECU for timely ignition.

It fits only Haima S5 474Z engine variants—no other Haima models (e.g., S7), non-Haima vehicles, or modified S5. Professional installation (cool engine, battery disconnection, torque checks) is recommended. Maintenance: Inspect every 30,000km (check for cracks/corrosion), replace spark plugs regularly (40,000–60,000km), avoid moisture. Original coils ensure voltage match, heat resistance, and ECU compatibility—aftermarket ones risk performance issues.

S5 474Z-18-100