CHAPTER SEVEN - VWType3.Org

CHAPTER SEVEN - VWType3.Org

21 Pages · 1998 · 1.59 MB · English

FUEL INJECTION The electronic fuel injection system was designed and built by Bosch and has been used successfully on several VW models and other cars.

CHAPTER SEVEN - VWType3.Org free download


[All content copyright Clymer Publications, Overland Park Kansas, 1972 Used with permission) PDF version of this document prepared by Greg Merritt ( [email protected]) , 1998 This document may be viewed in HTML format on the World Wide Web at http://wwwvwtype3org/CHAPTER SEVENFUEL INJECTIONThe electronic fuel injection system was designed and built by Bosch and has been used successfully on several VW models and other cars Complete service information for the fuel injected engine is beyond the scope of this manual Because of special knowledge and electronic test fixtures required, some services cannot be performed by the home mechanic The procedures in this chapter permit you to isolate and repair a majority of mechanical troubles, but some mechanical and all electrical unit procedures should be performed by the dealer BASIC PRINCIPLES The heart of the fuel injection system is the control unit, a small electronic "computer" Various sensors transmit information to the control unit concerning air temperature, engine temperature, engine speed, and engine load The control unit uses this information to determine the exact amount of fuel to be distributed to the cylinders Figure 1 is a simplified diagram of the entire fuel injection system; refer to it for the following descriptions Figures 2 and 3 are electrical diagrams which may be helpful when troubleshooting Air System Components of the air system are shown in Figure 4 Clean air from the oil bath air cleanerenters the intake air distributor past a throttle valve to the combustion chambers The throttle valve controls the flow of air During idle, the throttle valve is completely closed A bypass around the throttle valve permits a small amount of air, controlled by the idle speed screw, to pass When the engine is cold (below 122?F), the auxiliary air regulator bypasses a larger amount of air around the throttle valve This extra air mixes with extra fuel injected for cold starts As the engine warms up, the air regulator gradually closes; when the engine is fully warmed up (above 122 ?F), the regulator closes completely A pressure switch (1968 & 1969 only) and pressure sensor connect to the intake air distributor to sample manifold pressure and determine engine load Fuel System Figure 5 is a simplified drawing of the fuel system The fuel pump draws fuel from the frontmounted fuel tank through a filter and delivers it to 4 injectors A pressure regulator on the return line maintains fuel pressure at 28 psi Excess fuel from the regulator returns to the fuel tank The control unit controls the fuel pump through a relay, not shown in Figure 1 or Figure 4 When the ignition switch is turned on, the [All content copyright Clymer Publications, Overland Park Kansas, 1972 Used with permission) PDF version of this document prepared by Greg Merritt ( [email protected]) , 1998 This document may be viewed in HTML format on the World Wide Web at http://wwwvwtype3org/1 Fuel tank 2 Electric fuel pump 3 Fuel filter 4 Fuel pressure regulator 5 Pressure sensor 6 Air intake distributor 7 Cylinder head 8 Fuel injectors 9 Fuel loop line 10 Connection for fuel line (cold starting)11Ignition distributor with trigger contacts 12Electronic control unit 13 Throttle valve switch with power mixture enrichment 15 Cold starting jet 16Electromagnetic valve (cold starting) 17 Temperature switch (cold starting) 18 Auxiliary air regulatorA and B Signals from pressure sensor C and D Signals from trigger contacts E and F Signals from temperature sensors (warming up phase) G Signal from throttle valve switch (fuel shut off on overrun) G1 Power mixture enrichment 1 Signal from starter (term 50) J Signal to injectors 1 and 4 K Signal to injectors 2 and 3 [All content copyright Clymer Publications, Overland Park Kansas, 1972 Used with permission) PDF version of this document prepared by Greg Merritt ( [email protected]) , 1998 This document may be viewed in HTML format on the World Wide Web at http://wwwvwtype3org/ [All content copyright Clymer Publications, Overland Park Kansas, 1972 Used with permission) PDF version of this document prepared by Greg Merritt ( [email protected])

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