1. Boat Parts In Otsterndriv Sterndrive Prices For Sale.
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  3. MERCURY 806957-4

MERCURY 806957-4 Cdi Box Mag Gm Engine Ignition Ecu Ecm 5.7 V8

fits model: Marine, 350, Mercruiser. make: Mercury.

806957-4 Mercury Mercruiser 5.7 L 350 Mag V8 Gm Marine Engine Ignition Cdi Box Ecu Ecm Computer

( Manufacturer Part Number: 806957-4 ), ( Part Type: Ignition Ecm Box Engine Ecu ), ( Country Of Origin: United States )

Review MERCURY 5.7 Mag V8 Gm Engine Ignition Cdi Box Ecu Ecm Computer fits MERCRUISER MARINE 350

The Mercury 806957-4 CDI Box ECM/ECU is a crucial component of the Mercruiser 5.7 350 Mag V8 GM Marine Engine. This ignition system control box plays a significant role in managing the engine's ignition and fuel systems to ensure optimal performance and fuel efficiency.

The Mercury 806957-4 is a Digital Electronic Control Ignition (DECI) system designed to provide precise spark timing for each cylinder. It features a state-of-the-art Continuous Duty Ignition (CDI) technology that generates high-voltage sparks necessary for efficient combustion. By utilizing digital technology, this ignition control box offers improved performance, reliability, and easier adjustability compared to conventional mechanical systems.

The ECM (Engine Control Module) and EEC (Engine Electronic Control) elements within the Mercury 806957-4 work in harmony to manage engine functions such as fuel injection, ignition timing, and engine diagnostics. The ECM is the primary brain of the system, analyzing and processing data from various sensors to make real-time adjustments for optimal engine performance. The EEC, on the other hand, controls the fuel injection system to ensure a consistent fuel-air mixture for efficient combustion.

This ignition control box is designed to be durable, with a sealed and waterproof construction to protect against damage from the marine environment. It is also compatible with a range of Mercury and Mercruiser marine engines, making it a versatile choice for boat owners.

In summary, the Mercury 806957-4 CDI Box ECM/ECU is an essential component of the Mercruiser 5.7 350 Mag V8 GM Marine Engine. Its advanced digital ignition technology ensures precise spark timing for each cylinder, while its compatibility with various marine engines makes it a versatile choice for boat owners. With its durable, waterproof construction, this ignition control box is built to withstand the rigors of the marine environment, providing reliable performance and optimal engine efficiency.

Pros and Cons of Buying a Mercury 806957-4 Mercruiser 5.7 350 Mag V8 GM Marine Engine Ignition CDI Box ECM

I. Introduction

The Mercury 806957-4 Mercruiser 5.7 350 Mag V8 GM Marine Engine Ignition CDI Box ECM is a crucial component of the marine engine system. This part is responsible for managing engine ignition and fuel injection. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this component.

II. Pros

1. Improved Performance: A CDI (Capacitor Discharge Ignition) system offers enhanced combustion efficiency and more powerful ignition than traditional points-type ignition systems.

2. Reliability: The CDI box is known for its durability and long service life, making it a reliable investment for boat owners.

3. Fuel Economy: The ignition system plays a significant role in optimizing fuel consumption. A well-functioning CDI box can help improve fuel efficiency.

4. Easy Installation: This aftermarket CDI box is designed to be a direct replacement for the OEM component, making the installation process relatively simple and straightforward.

III. Cons

1. Cost: While the improved performance and reliability may be worth the investment for some, the cost of the aftermarket CDI box may be a deterrent for others.

2. Compatibility: Ensure the CDI box is compatible with your specific marine engine model and year before making a purchase.

3. Complexity: Although the installation process is generally simple, the CDI box itself is a complex electronic component. The replacement process may require some technical knowledge, making it a potential challenge for inexperienced boat owners.

IV. Conclusion

The Mercury 806957-4 Mercruiser 5.7 350 Mag V8 GM Marine Engine Ignition CDI Box ECM offers several advantages, such as improved performance, reliability, and potential fuel savings. However, the cost and potential complexity of the installation process may be a concern for some boat owners.

V. Recommendation

If you are looking to enhance your marine engine's performance, reliability, and fuel efficiency, the Mercury 806957-4 Mercruiser 5.7 350 Mag V8 GM Marine Engine Ignition CDI Box ECM could be an excellent investment. However, it is crucial to weigh the potential benefits against the cost and consider your technical abilities before making a purchase. Alternatively, consulting a professional marine mechanic for advice may help you make an informed decision.

Details:

Part was removed from a MerCruiser 5.7 L 350 Mag V8 GM Marine engine. Look at pictures closely and ask any questions, I try to describe parts as best can. Condition: Good used condition. I will do my best to resolve the issue.

Thanks -Mike. Mounting hardware is only included if it shown in the pictures. Shelf 29-14-3-B #0936. What you see in the pictures is what get.

Please look at all pictures and read entire before buying.

part #: 8069574 price

  • $999.00

specifications otsterndriv:

  • for models: Marine, 350, Mercruiser
  • for makes: Mercury
  • mpn: 806957-4
  • part type: Ignition Ecm Box Engine Ecu
  • country of origin: United States

returns otsterndriv:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Buyer

general otsterndriv:

  • Boat Parts > Sterndrive Motors Components > Other
  • condition: Used

offer otsterndriv:

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  • availability: In Stock
  • started: March 19, 2026
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  • quantity: 1

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for models: marine, 350, mercruiser, for makes: mercury, part type: ignition ecm box engine ecu, country of origin: united states,
category: boat parts > sterndrive components, sku: 4972322818387604,
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1 offer $999.00 USD
  • Used. Offer #1 priced at $999.00 + $17.10 shipping estimate = $1016.10* total. I will do my best to resolve the issue. View product.+$17.10 shipping

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