The Holley Sniper 2 EFI System is a cutting-edge, ground-up redesign of the original Sniper EFI, offering improved features and ease of use for EFI conversions. It retains popular features like self-tuning and a user-friendly calibration wizard while introducing advancements like the Power Distribution Module (PDM) for simplified installation. Designed to enhance performance and reliability, the Sniper 2 is a versatile solution for modernizing classic engines with modern fuel injection technology.

1.1 Overview of the Holley Sniper 2 EFI

The Holley Sniper 2 EFI is a modern, all-in-one electronic fuel injection system designed to simplify EFI conversions for classic and performance vehicles. It features a compact, rugged design with a built-in Power Distribution Module (PDM) for easy installation. The system includes a throttle body with a hidden throttle position sensor (TPS) and fuel connections on the passenger side. Its self-tuning capability and user-friendly calibration wizard make it accessible for enthusiasts of all skill levels. The Sniper 2 EFI is compatible with various engines and offers improved performance, reliability, and fuel efficiency compared to traditional carburetors.

1.2 Key Features and Benefits of the Sniper 2

The Holley Sniper 2 EFI boasts several standout features, including its self-tuning capability, which simplifies calibration for optimal performance. It also includes a built-in Power Distribution Module (PDM) for streamlined wiring and installation. The system offers a compact design with a hidden throttle position sensor (TPS) and fuel connections located on the passenger side for a cleaner look. Additionally, the Sniper 2 provides improved fuel efficiency, enhanced reliability, and compatibility with a wide range of engines. These features make it an ideal upgrade from traditional carburetors, delivering modern performance with minimal complexity.

Pre-Installation Preparation

Before installing the Holley Sniper 2 EFI, ensure a switched 12v ignition source is identified, providing power during crank and run. Do not connect this wire yet. Gather all necessary tools and materials for a smooth installation process.

2.1 Choosing the Right Sniper 2 EFI Kit for Your Vehicle

Selecting the correct Holley Sniper 2 EFI kit is crucial for compatibility and performance. Kits like the 550-510-3XX are tailored for specific engine types and fuel systems. Consider your engine’s displacement, fuel system requirements, and transmission type. Ensure the kit matches your vehicle’s horsepower and configuration. Visit Holley’s configurator to find the ideal setup. Proper kit selection ensures seamless installation and optimal performance. Always verify compatibility before purchasing.

2.2 Essential Tools and Materials Needed

For a successful Holley Sniper 2 EFI installation, gather essential tools and materials. These include a torque wrench, carb stud nuts, fuel line, and wiring connectors. Ensure you have a switched 12V ignition source and proper transmission kickdown brackets. Additional materials like gaskets, throttle linkage, and a fuel system compatible with EFI are required. Refer to the Holley Sniper 2 EFI Quickstart Manual for a detailed list. Having all components ready ensures a smooth installation process. Always read the manual before starting.

2.3 Preparing the Engine and Fuel System

Before installing the Holley Sniper 2 EFI, ensure your engine and fuel system are prepared. Inspect the intake manifold for cleanliness and proper sealing surfaces. Verify that the fuel system is compatible with EFI, including a high-pressure fuel pump, fuel lines, and a fuel filter. Check for any vacuum leaks and ensure the throttle body installation area is clear of debris. Properly connect the fuel lines to the throttle body, ensuring the fuel pressure is set correctly. Refer to the Holley Sniper 2 EFI Quickstart Manual for specific requirements.

Installation Instructions

The Holley Sniper 2 EFI installation involves mounting the throttle body, connecting the wiring harness, and setting up the fuel system. Follow the provided manual for precise steps to ensure a smooth setup.

3.1 Throttle Body Installation

Mount the Sniper 2 throttle body onto the intake manifold using a new gasket. Secure it with carb studs and nuts, tightening progressively in a crisscross pattern to 60-80 in.lbs. Ensure proper alignment and avoid over-tightening. Install the throttle linkage, connecting it to the throttle body’s arm. The Sniper 2 features a hidden throttle position sensor (TPS) for a cleaner look. Refer to the manual for specific torque specifications and linkage adjustment instructions to ensure optimal performance and proper throttle response.

3.2 Wiring and Electrical Connections

Begin by identifying a switched 12V ignition source that provides power during cranking and the run position. Connect the Sniper 2 system’s main wiring harness to this source, ensuring proper polarity. The Power Distribution Module (PDM) simplifies wiring by handling power distribution for key components; Carefully connect all sensors, including the throttle position sensor (TPS) and fuel pressure sensor, to their respective ports. Verify all connections are secure to avoid electrical interference or system malfunctions. Refer to the wiring diagram in the manual for specific instructions and pin assignments.

3.3 Fuel System Setup and Connections

Install the fuel lines, ensuring proper routing and connections to the throttle body’s fuel ports, located on the passenger side. Connect the fuel pump wiring to the Power Distribution Module (PDM) for reliable power supply. Verify fuel pressure settings and ensure all fittings are secure to prevent leaks. Bleed the fuel system to remove air bubbles before initial startup. Refer to the manual for specific torque specifications and connection diagrams to guarantee a leak-free and efficient fuel system setup.

Calibration and Tuning

The Holley Sniper 2 EFI features a user-friendly calibration wizard and self-tuning capability for seamless performance optimization. Advanced tuning options allow for precise adjustments to fuel mapping and ignition timing, ensuring optimal engine performance under various conditions. Utilize the provided software tools and detailed manual for guided tuning processes;

4.1 Initial Calibration Steps

Begin by connecting all necessary components, including sensors and wiring, ensuring proper electrical connections. Use the 3.5-inch touch screen to navigate the calibration wizard, inputting engine specifications like displacement and fuel type. The system will guide you through base setup, allowing the ECU to adapt during initial engine runs. Monitor the dashboard for real-time feedback and adjust settings as needed. Once the base calibration is complete, review the calibration report to ensure accuracy before proceeding to advanced tuning.

4.2 Using the Self-Tuning Feature

The Sniper 2 EFI features an advanced self-tuning capability that simplifies the calibration process. After initial setup, the system uses a learning algorithm to adapt to your engine’s operating conditions. During normal driving or engine operation, the ECU automatically adjusts fuel delivery and ignition timing for optimal performance. Use the 3.5-inch touch screen to enable the self-tuning wizard, which guides you through the process. Monitor the dashboard for real-time feedback and adjustments, ensuring the system fine-tunes itself for your specific application.

4.3 Advanced Tuning Options

For experienced users, the Sniper 2 EFI offers advanced tuning options to fine-tune engine performance. Access the Tuning Wizard via the 3.5-inch touch screen to adjust parameters like fuel delivery, ignition timing, and sensor inputs. Customize settings for specific driving conditions or engine modifications. The system supports real-time adjustments, allowing you to monitor and tweak performance on the fly. Advanced categories include Basic, System, Advanced, Advanced 2, and Super Sniper modes, catering to various levels of customization and optimization needs.

Troubleshooting Common Issues

Identify and resolve common issues like system errors, fuel leaks, or wiring problems by consulting the Holley Sniper 2 EFI manual or contacting technical support.

5.1 Diagnosing System Errors

Diagnosing system errors in the Holley Sniper 2 EFI involves checking the ignition source, sensor connections, and wiring. Ensure the switched 12V ignition source provides power during cranking and run. Verify throttle position sensor (TPS) and fuel connection integrity, as issues here can trigger system errors. Review wiring connections for loose links or corrosion. Refer to the Holley Sniper 2 manual or contact technical support for detailed troubleshooting steps and resolving specific error codes effectively.

5.2 Resolving Fuel System Problems

Resolving fuel system issues with the Holley Sniper 2 EFI involves inspecting fuel connections, lines, and pumps. Ensure the fuel connections on the passenger side of the throttle body are secure and not leaking. Check for blockages in the fuel filter or lines. If fuel pressure is inconsistent, verify the fuel pump operation and gauge accuracy. Use the Power Distribution Module (PDM) to diagnose electrical issues affecting the fuel system. Refer to the Holley Sniper 2 manual for detailed troubleshooting steps and consider replacing faulty components to restore proper fuel flow.

5.3 Addressing Electrical Connection Issues

Addressing electrical issues with the Holley Sniper 2 EFI begins with verifying all connections to the ECU, sensors, and components. Ensure the Power Distribution Module (PDM) is properly installed and all wires are securely connected. Check for loose or corroded connections, especially the ignition source, which must provide 12V during cranking and runtime. Avoid connecting the switched 12V wire incorrectly, as it can damage the system. Use the correct gauge wiring to prevent voltage drops. Refer to the Holley Sniper 2 manual for wiring diagrams and troubleshooting steps to resolve electrical malfunctions effectively.

Maintenance and Upkeep

Regular maintenance ensures optimal performance of the Holley Sniper 2 EFI. Clean the throttle body, inspect fuel injectors, and check electrical connections. Replace filters and ensure proper grounding to prevent issues. Refer to the Holley Sniper 2 manual for detailed maintenance schedules and procedures to keep your system running smoothly and efficiently over time.

6.1 Routine Maintenance Tips

Regular maintenance is crucial for the longevity and performance of your Holley Sniper 2 EFI. Start by cleaning the throttle body and fuel injectors to ensure proper airflow and fuel delivery. Inspect all electrical connections for corrosion or damage, and verify that the system is properly grounded. Replace air and fuel filters as recommended in the manual to prevent contamination. Additionally, check the fuel lines and connections for leaks or wear. Routine inspections and timely replacements will help maintain optimal performance and prevent potential issues down the road.

6.2 Cleaning and Inspecting Components

Regular cleaning and inspection of the Holley Sniper 2 EFI components are essential for maintaining performance. Start by cleaning the throttle body with a soft brush and mild solvent to remove dirt and debris. Inspect the fuel injectors for blockages and clean them if necessary. Check the electrical connections for corrosion or damage and ensure all wires are securely attached. Additionally, examine the fuel lines and connections for signs of wear or leaks. Regular cleaning and inspection help prevent issues and ensure the system operates efficiently. Always follow the manufacturer’s guidelines for cleaning solutions and tools to avoid damage.

Upgrading from Sniper to Sniper 2

Upgrading from the original Sniper to the Sniper 2 is seamless, offering enhanced features like improved self-tuning, a hidden TPS, and a more compact design for better performance.

7.1 Key Differences Between Sniper and Sniper 2

The Sniper 2 features a ground-up redesign with improved components like the Power Distribution Module (PDM) for simplified wiring. It includes a more compact throttle body design, a hidden throttle position sensor (TPS), and fuel connections relocated to the passenger side. The Sniper 2 also offers optimized firmware for better compatibility with the Self-Tuning Controller (STC) and enhanced performance. These upgrades make the Sniper 2 easier to install and more reliable than its predecessor, ensuring superior functionality and modernized features for EFI conversions.

7.2 Steps to Upgrade Your System

To upgrade to the Sniper 2, begin by reviewing the installation manual specific to your vehicle. Install the new throttle body, ensuring proper alignment and torque specifications. Transfer sensors and wiring from the original Sniper to the Sniper 2, noting the hidden TPS and passenger-side fuel connections. Connect the PDM for simplified power distribution. Finally, calibrate the system using the self-tuning feature or advanced settings. Ensure all firmware is up-to-date for optimal performance. This streamlined process ensures a smooth transition to the enhanced Sniper 2 EFI system.

The Holley Sniper 2 EFI System offers enhanced performance and reliability, making it a top choice for EFI conversions. Follow the instructions carefully for optimal results and refer to Holley’s resources for further assistance.

8.1 Final Tips for Optimal Performance

For optimal performance with the Holley Sniper 2 EFI System, ensure regular maintenance, such as cleaning sensors and inspecting wiring. Always follow the installation guide and use the correct tools to avoid damage. Double-check electrical connections and fuel system setup for proper function. Refer to Holley’s resources for troubleshooting and advanced tuning. By adhering to these guidelines, you’ll maximize efficiency, power, and reliability, ensuring your engine runs smoothly with the Sniper 2 EFI system.

8.2 Resources for Further Assistance

For further assistance with the Holley Sniper 2 EFI System, visit Holley.com for comprehensive guides, installation videos, and technical support. The Holley Sniper 2 EFI Quickstart Manual (199r12505_website.pdf) is an essential resource, offering detailed step-by-step instructions. Additionally, Holley provides a dedicated support team reachable via phone (1-866-464-6553) or email for troubleshooting and advanced tuning inquiries. These resources ensure a seamless experience with your Sniper 2 EFI system, from installation to fine-tuning.