Ignition Coil + Iridium Spark Plugs for Mazda MX-5 Miata (2001-2005) 1.8L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2001-2005 Mazda MX-5 Miata

What it Does: The Direct-Fit Ignition Coil and Iridium Spark Plug Kit restores complete combustion efficiency on the 2001-2005 Mazda MX-5 Miata to eliminate high-RPM misfires and restore sharp throttle response.

The Stock Mazda MX-5 Miata Ignition Breakdown

On the second-generation NB chassis equipped with the variable valve timing BP-Z3 engine, heat soak directly atop the cylinder head cover degrades the factory coil packs. Continuous thermal cycling deteriorates the internal primary and secondary windings, resulting in voltage leakage, erratic idle, and hesitation under load. Furthermore, factory plugs with eroded gaps increase electrical resistance, accelerating thermal breakdown of the coil potting compound and triggering diagnostic trouble codes.

The Engineering Solution

This refresh package pairs high-dielectric replacement coil packs with fine-wire iridium spark plugs to deliver consistent spark energy across the entire rev range. The ignition coils utilize premium thermoset epoxy resin and high-grade copper wire windings to resist thermal shock, engineered to OEM dwell and inductance specs for direct interchange with BP6D18100A and UF408. The accompanying fine-wire iridium plugs feature a high-melting-point center electrode that minimizes quenching and requires significantly less breakdown voltage, stabilizing the flame kernel under aggressive VVT cam advance.

Technical Specifications

Compatibility

• 2001-2005 Mazda MX-5 Miata Base 1.8L L4
• 2001-2005 Mazda MX-5 Miata LS 1.8L L4
• 2003 Mazda MX-5 Miata Shinsen 1.8L L4
• 2001-2003 Mazda MX-5 Miata Special Edition 1.8L L4

Frequently Asked Questions

Does this fit the NB MX-5 Miata?
Yes, this is a direct fit for the 2001-2005 Mazda MX-5 Miata equipped with the BP-Z3 1.8L engine.

Do these iridium spark plugs require manual gapping before installation?
No, these iridium plugs are pre-set to factory clearance; manual gapping should be avoided to prevent fracturing the fine-wire center electrode.

The Mazda Roadster Standard

High-revving JDM platforms rely on millisecond ignition accuracy to maintain balanced mid-range torque and a crisp 7,000 RPM redline. Restoring your ignition circuit ensures complete cylinder pressure containment and instantaneous throttle modulation through every corner.