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Holley MPI PRO-JECTION Installation Tuning And Troubleshooting Manual

Fuel injection system
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MPI
INSTALLATION TUNING AND
TROUBLESHOOTING MANUAL
NOTE:
These instructions must be read and fully understood before beginning
installation. If this manual is not fully understood, installation should not be
attempted. Failure to follow these instructions, including the pictures may
result in subsequent system failure.
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  • Page 1 INSTALLATION TUNING AND TROUBLESHOOTING MANUAL NOTE: These instructions must be read and fully understood before beginning installation. If this manual is not fully understood, installation should not be attempted. Failure to follow these instructions, including the pictures may result in subsequent system failure. TABLE OF CONTENTS:...

  • Page 2: Table Of Contents

    8.0 PLANNING THE INSTALLATION ........................9.0 REMOVAL OF EXISTING FUEL SYSTEM ......................Preparing the manifold for Installation ....................Installation of the MPI Pro-Jection Manifold ................... Installing the Distributor .......................... Vacuum Connections ..........................10.0 FUEL SUPPLY AND RETURN FUEL SYSTEM INSTALLATION ...............

  • Page 3: Introduction

    1.0 INTRODUCTION Holley Performance Products has written this manual for the installation of the MPI PRO-JECTION fuel injection system. This manual contains all the information needed to install this system. Please read all the WARNINGS, NOTES and TIPS, as they...

  • Page 4: Before You Begin

    Fuel injection systems have proven to increase engine performance by allowing the engine to operate to the best output it is capable of producing. Make sure your engine is in good basic running order before installing the MPI PRO-JECTION fuel injection system.

  • Page 5: Additional Items Required For Installation

    • Set of Allen wrenches 7.0 MPI PRO-JECTION SYSTEM OPTIONS MPI PRO-JECTION systems offer several optional brackets and spacers designed to simplify installation in certain applications. These parts can be ordered separately by contacting our sales department. (See figures 17-21 for dimensions and applications.) 8.0 PLANNING THE INSTALLATION...

  • Page 6: Preparing The Manifold For Installation

    4 - Soak a clean shop rag with solvent, and clean all sealing surfaces. Surfaces must be completely clean to ensure a reliable seal between the components and gaskets. 9.2 Installation of MPI Pro-Jection Manifold WARNING! Use new gaskets. Be sure you are using the proper gasket for your engine, for aluminum manifolds, as recommended by the manufacturer.

  • Page 7: Installing The Distributor

    NOTE: Consult your engine manual for proper fastener torque, bolt tightening pattern and other manifold installation specifications. 11 - Lubricate the fuel injector top and bottom O-rings and place the injectors in the manifold. Use only lubricant recommended for O-rings or clean mineral motor oil to lubricate the O-rings. Do not use synthetic, animal or vegetable oils.

  • Page 8: Vacuum Connections

    manifold. 4 - Ensure the distributor shaft is fully engaged in the oil pump. 5 - Bolt the distributor hold down clamp to the manifold. 6 - Replace the distributor cap. 7 - Replace the spark plug wires and check that they are in the correct firing order.

  • Page 9: Fuel Pump

    SUPPORT SOLIDLY WITH JACK STANDS. The MPI PRO-JECTION fuel pump is a high quality pump that supplies at least 45 gph at 300kPa (43.5psi). The high-pressure fuel pump has limited suction characteristics so it needs to be mounted as low as possible and should be mounted no higher than the top of the fuel tank.

  • Page 10: Fuel Line Mounting

    PRESSURE COULD RESULT IN FUEL LEAKS OR BURSTING OF THE FUEL FILTER. A FUEL LEAK MAY RESULT IN A FIRE OR EXPLOSION HAZARD, WHICH COULD CAUSE SERIOUS INJURY OR DEATH. The fuel filter supplied by Holley meets or exceeds the above specifications. Most filters for carburetor systems and other EFI systems do not.

  • Page 11: Oxygen Sensor Installation

    10.7.1 Oxygen Sensor Function, Theory, and Use The MPI PRO-JECTION system allows the user to operate their engine in a closed loop fuel management mode using the oxygen sensor. The oxygen sensor monitors the exhaust gases and generates a voltage output signal that corresponds to the fuel/air mixture ratio.

  • Page 12: Oxygen Sensor Mounting Procedure

    3 - On vehicles equipped with an AIR pump, the oxygen sensor must be mounted before the AIR injection into the exhaust, or the AIR pump must be disconnected. Holley recommends that if the AIR is injected into both exhaust manifolds, mount the oxygen sensor into the pipe immediately after the exhaust manifold.

  • Page 13: Electrical Connections

    4 - Slit the 2” grommet provided and position around the wiring harness. Slip the grommet into the 2” hole to prevent the wiring harness from chaffing. A light application of WD-40 on the grommet will ease the installation. 5 - Connect the wiring harness to the ECU. Push the plug into the ECU until the lock snaps into position. 11.0 ELECTRICAL CONNECTIONS An electrical diagram is provided for reference during connection of electrical components.

  • Page 14: Fuel Pump

    11.8 Fuel Pump Locate the single GREEN/BLACK wire at the fuel pump relay. Feed this wire down through the engine compartment to the underside of the vehicle. Route the GREEN/BLACK wire to the fuel pump. Connect the fuel pump pigtail connector to the fuel pump.

  • Page 15: Oil Pressure Switch

    For first time users, you may need to read section 14.0 for a description of the MPI PRO-JECTION system software. Turn the ignition on and connect the PC to the MPI PRO-JECTION wiring harness.

  • Page 16: Oxygen Sensor Effect On Performance

    “band” around the optimum fuel mixture. A minimum amount of performance difference can be found within the extremes of this band and Holley recommends that the user tune to the rich side of this band. This will generally result in a slightly rich map (around 10-20%) that will give very good performance without sacrificing performance, economy, driveability, or engine durability.

  • Page 17: Getting Started Tuning And Programming (Di System)

    An IBM compatible personal computer (preferably a laptop for portability) with EGA (or better) monitor is required for adjustment with the Di system. The PC must have DOS level 6.0 or Windows 3.1 or Windows 95 to run the Holley software package. The software is not designed to use a mouse with the DOS and Windows 3.1 Versions, but will run with Windows 95.

  • Page 18: Windows 3.1

    2 - From the Window Program Manager menu: Select File. Select New. On the New Program Object dialog box Select the Program Group Radio Button. Click the OK button. 3 - On the Program Group Properties dialog box: For Description type Holley EEV 3.0. For the Group File type EEV. Click the OK button.

  • Page 19: Mapview

    14.2 Mapview Once the ECU is connected and the engine is running, Mapview can be selected from the main menu. If the PC is connected correctly and the ECU is active, the Injection Volume map will be displayed in graphical form. The displayed graph shows the Injection Volume curve.

  • Page 20: File

    14.4.1 File If “File” is chosen, the following pull down menu will appear revealing the following commands on the PC screen: 1 - Load Map - Use this selection to load a previously saved Map from the hard drive of the PC to the ECU. 2 - Save Map - Use this selection to save a Map on the hard drive of the PC.

  • Page 21: Edit

    A value of 55 is equivalent to 0.55 volts or a stoichiometric fuel/air mixture. NOTE: The values programmed at Holley allow for a slightly lean mixture at light cruise, and a slightly rich mixture at higher throttle applications. A maximum Oxy Trigger Value of 80 or 0.8 volts which corresponds to a slightly rich mixture can be entered...

  • Page 22: Graph

    DISABLED, by pressing “F3” until the desired delay appears on the screen and press “enter”. J - Ignition type - Either “Holley”, “Ford” or “GM” ignition type will be displayed. Select your ignition type by pressing “F2” until the desired type is displayed, then press “enter”.

  • Page 23: Print

    14.5 Tuning Tips An IBM compatible personal computer (preferably a laptop for portability) must be connected to the MPI PRO-JECTION ECU. The goal of this tuning process is to obtain a fuel map that is slightly rich. The advantage with this system is the personal computer can be used to monitor and change various engine parameters during the tuning process.

  • Page 24: Other General Tuning Tips (Closed And Open Loop)

    Any paragraph that does not start by specifically stating it only applies to only one system is intended for both system configurations. 1 - Load the Holley software package into your laptop computer following the procedures outlined above. Connect PC to the ECU using DB-9 cable provided.
  • Page 25 In addition, select a temperature that you would like to have the engine enter closed loop control mode. Holley has used a value of 110° F in the base maps for marine use, and 75°...
  • Page 26 Good results have been achieved by Holley by setting full throttle fuel to obtain an Oxygen Voltage of 0.85 volts during full throttle acceleration. Any Oxygen...

  • Page 27: Operation Of The Pro-Jection System

    2 - Add Holley fuel system cleaner to the gas tank every 3 months according to the directions on the system cleaner. This will keep injector patterns optimal for best performance and economy.

  • Page 28: General Troubleshooting

    5 - Be sure all electrical connections are secure and wires are away from moving parts. Apply a fresh coat of silicone dielectric grease to all electrical terminals to help conductivity and reduce corrosion. 6 - If a drop in performance is noticed, a dirty fuel filter may be the problem. Change as required. 7 - During extended periods of storage (60 days or more) gasoline my deteriorate due to oxidation.

  • Page 29: Testing And Troubleshooting Electrical Components

    - MAP sensor hooked up improperly - Using vacuum gauge, ensure MAP sensor is hooked - Faulty MAP sensor up to full manifold vacuum - Faulty coolant temperature sensor - See Testing MAP Sensor section - See Testing Coolant Temperature Sensor section High idle speed - Idle speed not adjusted correctly - Set idle speed.

  • Page 30: Throttle Position Sensor (Tps) Adjustment

    0” Hg vacuum 2.3 volts at sea level (less at altitude) 18.3 Throttle Position Sensor (TPS) Adjustment Adjust the sensor as follows: 1 - Locate the harness wiring that connects to the TPS and remove a piece of the sheathing from the GREEN wire and the BLACK/WHITE wire.

  • Page 31: Testing Idle Air Control (Iac) Motor

    The MPI PRO-JECTION systems oxygen sensor performance can be evaluated. The oxygen sensor voltage can be checked through the monitor option of the MPI PRO-JECTION software. The other option if no PC is available is to probe the gray wire from the oxygen sensor connector with the positive (+) lead of a digital voltmeter.
  • Page 32 Holley Copyright  1998 Printed in U.S.A. Performance Products Inc 199R-10033 Date: 10-30-98...

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