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TABLE OF CONTENTS
Part #3550 and #3551
Introduction.................................................................................................................................................1
Components................................................................................................................................................2
Preliminaries ....................................................................................................................................
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COMPONENTS q Electronic Control Unit/System ECU q Fuel filter q Calibration Module q Fuel rail assembly q Distributor conversion kit q Fuel pressure regulator q Ignition amplifier q Fuel injectors q ECU power relay/Fuel pump relay q Intake manifold q Manifold Absolute Pressure (MAP) Sensor q Four barrel air valve q Manifold Air Temperature (MAT) Sensor q Idle Air Control (IAC) solenoid, integrated with air valve q Coolant Temperature Sensor (CTS) q Main system harness q Throttle Position Sensor
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TOOLS AND EQUIPMENT HARDWARE AND PARTS RECOMMENDED Use the following checklist for items needed. Use the following checklist for items needed. q Box and open end wrenches q Intake gasket - Edelbrock #7203, OEM, or equivalent q Socket set q Pipe plugs, if needed q Distributor wrench q 5/16-inch steel tubing (approximate equal length to fuel pickup q Pliers (channel locks and hose clamp) line in tank) q Screwdrivers (regular and Phillips) q Edelbrock Gasgacinch #9300 q Torque wrench q Loctite 598
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DETERMINING HOOD CLEARANCE NOTE: Check hood clearance before removing stock manifold. 1. Use modeling clay or putty to make five small cones, two or three inches high. 2. Position cones on air cleaner at front, rear, each side, and on center stud. 3. Close hood to locked position and re-open. 4. The height of the cones indicate the amount of clearance between the hood and the air cleaner. Record these measurements. MANIFOLD & CARBURETOR HEIGHT VS. PRO-FLO HEIGHT 1. Remove air cleaner. 2. Lay a s
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FUEL REQUIREMENTS Because the Pro-Flo system uses an Oxygen sensor, you must use unleaded fuel only. Leaded fuels will damage the O sensor. If you do use 2 leaded fuel in your vehicle, do not install the O2 sensor and do not operate the vehicle in the closed loop fuel mode. AUTOMATIC TRANSMISSION CHECK For best performance, economy, and emissions, the shift point must be checked before and after the manifold change. NOTE: This check should be performed ONLY at a sanctioned drag strip or test tr
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FUEL SYSTEM Because your Edelbrock Pro-Flo system controls fuel delivery very differently than a carburetor, some conversions to your fuel system are necessary. Pro-Flo electronic fuel injection requires high and constant fuel volume and fuel pressure. For this reason, a good primary fuel line is critical. The Pro-Flo system includes a 3/8-inch high pressure fuel line which must be used as the primary fuel line. The fuel that bypasses the injectors must be returned to the fuel tank via a retur
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RUBBER RETURN LINE METHOD Drill a 5/16-inch hole in the sending unit plate adjacent to where the main line enters the tank. This will be the hole for your return line. Insert a short length of 5/16-inch hard line (available at most radiator shops) into the hole and weld it to the sending unit plate. The hard line should extend through the hole 1 to 2 inches on each side of the plate. Connect a length (at least 4 inches) of 5/16-inch rubber return line hose to the hard line that will extend into
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BULKHEAD FITTING METHOD HARD RETURN LINE METHOD Drill a 5/16-inch hole in the sending unit plate adjacent to where the main line, enters the tank. This will be the hole for your return line. Insert a length of 5/16-inch hard line (available at most radiator shops) into the hole and weld it to the sending unit plate. The hard line should extend through the hole 1 to 2 inches on the outside of the plate. On the inside of the plate, the hard line should follow the contours of the fuel pickup line.
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NOTE: ALL WELDING AND SOLDERING OF THE FUEL SYSTEM MUST BE PERFORMED BY A PROFESSIONAL RADIATOR AND/OR FUEL SYSTEM REPAIR SHOP. FUEL SYSTEM INSTALLATION 1. Drain the fuel tank. 2. Remove all fuel lines from the tank and from the carburetor. 3. Remove the fuel tank. NOTE: While the fuel tank is removed from the car, it is recommended that it be professionally cleaned in order to remove any rust or dirt that may have accumulated inside and which could damage the injectors. 4. Remove the sending u
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INDUCTION SYSTEM The Edelbrock Pro-Flo system delivers fuel and air to the engine via the induction system consisting primarily of a manifold, 4-barrel air valve, fuel rails, and fuel injectors. The induction system is fully assembled, tested, seal checked, and flowed at the factory and is as easy to install as a manifold. DO NOT DISASSEMBLE any of these components during installation. FUEL RAILS The extruded aluminum rail assembly routes the high pressure fuel to the injectors. Aluminum rails
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PRE-INSTALLATION Before installing the induction system, take the following steps to ensure successful installation and performance 1. Check all components thoroughly for damage. 2. Make sure all throttle linkages open entirely and close freely. 3. Make sure all fuel inlet and vacuum ports are free from packing material. 4. Check the installation kit for proper parts. REMOVING THE STOCK CARBURETOR AND MANIFOLD 1. Disconnect battery. 2. For ease of installation, keep all parts in order. CAUTION:
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GASKET SURFACE PREPARATION CAUTION: Replace all gaskets as recommended. Do not use race-type non-embossed gaskets for street applications. Due to material deterioration under street driving conditions, internal vacuum and oil leaks may occur.We recommend Fel-Pro Printoseal gaskets #1212 or equivalent. Do not use Fel-Pro Permatorque Blue gaskets, which are designed for use on stock cast iron intake manifolds only. 1. Check gaskets on head surface and manifold to make sure they are correct. Emboss
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SENSORS The Edelbrock Pro-Flo system interprets overall engine operating conditions and fuel/spark requirements based on readings from sensors that measure specific engine conditions. The Pro-Flo system includes five sensors: 1) Manifold Absolute Pressure 2) Manifold Air Temperature 3) Coolant Temperature 4) Throttle Position 5) Exhaust Oxygen (O ) 2 These sensors, with the exception of the O , are designed as an integral part of the induction system and require no installation. The O sens
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COOLANT TEMPERATURE SENSOR The Coolant Temperature Sensor is a thermistor device like the Manifold Air Temperature sensor. Resistance varies as coolant temperature rises and lowers. The Coolant Temperature Sensor is located at the front of the manifold on the driver’s side, and is connected to the Main System Harness by Connector J10. THROTTLE POSITION SENSOR The Throttle Position Sensor, an integral part of the Pro-Flo throttle body, measures throttle angle. This sensor requires adjustment as
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O SENSOR INSTALLATION 2 The exhaust gas oxygen content is determined by the oxygen sensor. The sensor signals the ECU, which compensates when the air/fuel mixture is either rich or lean. NOTE: It is recommended that the O sensor installation be performed by a professional muffler shop. 2 1. Double check header gaskets, replacing if necessary. 2. Drill a 1/2-inch to 9/16-inch hole in the passenger-side header collector reducer, as close to the header flange as possible. (1" to 3" away) NOTE: Bef
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MAIN SYSTEM HARNESS If the ECU is the brain of the Edelbrock Pro-Flo system, the Main System Harness is the central nervous system. Constructed with SAE grade wires and the most up-to-date Weatherpak connectors, the Main System Harness is a generic harness that can be used with any application for which the Pro-Flo system is designed. This diagram illustrates the entire Pro-Flo Main System Harness. Each connector is identified by a alpha-numeric code as listed below. 16 ©2005 Edelbrock Corporati
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CONNECTORS The “J” coding is for illustration purpose only. The connector ends DO NOT have a “J” code stamped on them J1 ECU J21 Oxygen sensor J26 Ignition amplifier J2 Calibration module J22 Connector to IAC J27 IAC connector J3 Pump harness J23 Relay P27 IAC connector to main harness J8 Throttle Position Sensor J24 ECU fuse RT1 Engine ground J9 Manifold Absolute Pressure sensor J25 Pump fuse RT3 Starter J10 Coolant Temperature sensor J11 Manifold Air Temperature sensor J12 D
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The Throttle Position sensor attaches to the harness with Connector J8. The Manifold Absolute Pressure sensor attaches to the harness with Connector J9. The Manifold Air Temperature sensor attaches to the harness with Connector J11. The Coolant Temperature sensor attaches to the harness with Connector J10. Only the fuel injector connectors are identical, but they are placed in logical sequence. Refer to the diagram when installing the harness connectors to the fuel injectors. In addition to the
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A. This 5-inch IAC wiring harness is attached between the Idle Air Control, mounted on the air valve, and Connector J3 on the Main System Harness. B. This 3-foot ignition amplifier wiring harness is attached to the distributor cap with the connector at right above, and at the ignition amplifier with the connector on the left above. The ground goes to the rear of the cylinder head. When used with a small cap distributor or any distributor with an external ignition coil, this harness must be slig
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C. The connector on left end (as drawn) of this 10-foot fuel pump wiring harness attaches to connector J3 on the Main System Harness. The two connectors on the right connect to the positive (+) and negative (-) terminals on the fuel pump. A sleeve and tie-wrap are provided to fit over the positive terminal once the connector is installed. This sleeve prevents the clamp from shorting the fuel pump terminals. The diagram below illustrates how the ignition amplifier, distributor, ignition amplifier
