Part Number: ACD D503A
AC Delco 12498334 Ignition Coil
Maintain strong ignition performance and dependable engine operation with the AC Delco 12498334 Ignition Coil. Designed to meet OEM specifications, this ignition coil delivers the high-voltage spark required for efficient combustion, smooth acceleration, reliable starts, and consistent engine performance under demanding marine conditions.
Modern marine engines rely on coil-on-plug ignition systems to provide accurate spark timing and efficient fuel combustion. Over time, ignition coils can weaken due to heat, vibration, and moisture exposure inside the engine compartment. A failing ignition coil can cause engine misfires, rough idle, hesitation, poor fuel economy, or loss of power under load. Replacing worn ignition components helps restore proper spark delivery and reliable performance on the water.
Manufactured by AC Delco, the 12498334 ignition coil is built using high-quality materials engineered for durability and long-term reliability. Designed as a direct-fit replacement, it provides dependable fitment and consistent ignition system performance for compatible GM-based marine engine applications.
Common Engine & Boat Fitments
The AC Delco 12498334 ignition coil is commonly used on select GM-based marine engines, including:
- Indmar Assault 325
- Indmar Monsoon 325
- Indmar Monsoon 340
- PCM Excalibur 5.7L
- Ilmor MV8 5.7L
- Ilmor MV8 6.0L
- MerCruiser 5.0L MPI
- MerCruiser 350 MAG MPI
- Volvo Penta 5.7Gi applications
These engines are frequently found in:
Supra Models
- Supra Launch series
- Supra SA
- Supra SL
- Supra Sunsport models
Moomba Models
- Moomba Mobius LSV
- Moomba Mojo
- Moomba Kaiyen
- Moomba Outback
Other Common Applications
- Malibu Wakesetter series
- MasterCraft X-Series and XT-Series
- Nautique towboats with compatible GM-based engines
- Chaparral sport boats and cruisers
The 12498334 ignition coil is commonly used in coil-on-plug ignition systems where reliable spark delivery and efficient combustion are essential for smooth engine performance and throttle response.
Fitment may vary depending on engine serial number and ignition system configuration, so confirming compatibility with part number 12498334 before ordering is recommended.
Key Features
- Genuine AC Delco OEM-quality ignition coil
- Designed for GM-based marine engine applications
- Coil-on-plug ignition system compatibility
- Helps restore reliable spark delivery and combustion efficiency
- Durable construction designed for harsh marine environments
- Supports smooth idle, throttle response, and dependable operation
- Direct-fit replacement for straightforward installation
Why Replace an Ignition Coil?
A weak ignition coil can reduce spark strength and create inconsistent engine performance. Replacing worn ignition components helps improve starting reliability, fuel efficiency, throttle response, and overall engine operation throughout the boating season.
If you’re servicing a GM-based marine engine in a Supra, Moomba, Malibu, MasterCraft, Nautique, or Chaparral, the AC Delco 12498334 ignition coil delivers the OEM-quality fit and reliable ignition performance your engine depends on.