Ignition Coil and Iridium Spark Plugs for Ford Aerostar (1990-1997) 4.0L
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OEM-Spec Replacement Ignition Coil and Iridium Spark Plug Kit for 1990-1997 Ford Aerostar
Direct-fit complete secondary ignition overhaul engineered to eliminate misfires, restore lost combustion efficiency, and ensure stable cold starting on 4.0L V6 Ford Aerostar platforms.
The Stock Aerostar Thermal and Dielectric Breakdown
The tightly packaged engine doghouse in the VN1 chassis Aerostar subjects the ignition system to continuous, intense thermal soak. Over extended heat cycles, factory coils experience dielectric breakdown as internal potting compounds micro-crack, creating high-voltage leakage paths to ground. This internal arcing drops secondary kilovolt output, causing weak spark delivery, hesitation under payload acceleration, poor fuel economy, and spark scatter under load.
The Engineering Solution
This replacement kit upgrades the ignition circuit using premium oxygen-free copper primary and secondary windings encased in a dense, high-dielectric thermoplastic casing designed to resist thermal degradation. Paired with fine-wire iridium spark plugs, the kit maximizes spark kernel growth while requiring lower ignition voltage to initiate combustion. Iridium center electrodes resist spark erosion, gap widening, and fouling under sustained engine load far better than standard nickel or copper cores.
Technical Specifications
| Fitment | 1990-1997 Ford Aerostar |
| Engine / Chassis | 4.0L Cologne OHV V6 / VN1 |
| Stock Output | 155 hp / 225 lb-ft (Approx) |
| Part Number | UF406, FD502, DG500, UF-406 |
Compatibility
- 1990 Ford Aerostar 4.0L V6 (Base, XL, XLT, Eddie Bauer)
- 1991 Ford Aerostar 4.0L V6 (Base, XL, XLT, Eddie Bauer)
- 1992 Ford Aerostar 4.0L V6 (Base, XL, XLT, Eddie Bauer)
- 1993 Ford Aerostar 4.0L V6 (Base, XL, XLT, Eddie Bauer)
- 1994 Ford Aerostar 4.0L V6 (Base, XL, XLT, Eddie Bauer)
- 1995 Ford Aerostar 4.0L V6 (Base, XL, XLT)
- 1996 Ford Aerostar 4.0L V6 (Base, XLT)
- 1997 Ford Aerostar 4.0L V6 (Base, XLT)
The Ford Workhorse Standard
Engineered for high-mileage durability, this kit maintains clean spark delivery under towing and passenger hauling conditions, ensuring optimal low-end torque retention and smooth idle operation across all service environments.
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