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FUEL INJECTION SYSTEMS

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					  FUEL INJECTION
SYSTEM OPERATION
    CHAPTER 11



                    CBC
                   AUTO
    FUEL INJECTION TYPES
   THROTTLE BODY INJECTION (TBI)
    – INJECTED ABOVE THROTTLE PLATES
    – SINGLE INJECTOR
   CENTRAL PORT INJECTION (CFI)
    – INJECTED ABOVE THROTTLE PLATES
    – USUALLY MORE THAN ONE
      INJECTOR
   PORT FUEL INJECTION (PFI)
    – INJECTORS IN INTAKE RUNNERS    CBC
                                    AUTO
              TBI UNIT
         (SOMETIMES CALLED CFI)

   FIRST STEP FROM
    CARBURETORS
   SOME CARB
    CHARACTERISTICS
   LOW PRESSURE
   MOVEABLE PINTLE
   PRESSURE IS         FIG 6-40 CLASS
    REGULATED
   SERVICEABLE
                                          CBC
                                         AUTO
LOW PRESSURE SYSTEM




                       CBC
                      AUTO
FUEL INLET AND OUTLET




                     CBC
                    AUTO
LOW PRESSURE FUEL
    INJECTOR
           13-16 PSI
           TWO O-RINGS
           BALL PINTLE
           USED ON TBI
            AND CFI
            SYSTEMS
           MESH SCREEN
           EASY TO
            REPLACE
                           CBC
                          AUTO
TWO INJECTOR SYSTEM




                       CBC
                      AUTO
               INJECTS AT
                EACH CYLINDER
PORT FUEL      HIGHER
INJECTION       PRESSURE
               FED OFF OF FUEL
                RAIL
               MORE EFFICIENT
                OPERATION
               MODES
                – MULTI-PORT
                – SEQUENTIAL

                                CBC
                               AUTO
PORT FUEL INJECTION




                       CBC
                      AUTO
        CENTRAL POINT
          INJECTION
   GM SYSTEM
   INJECTOR
    LOCATED IN
    LOWER HALF OF
    INTAKE
    MANIFOLD
   POPPET VALVES
   HIGH PRESSURE   FIG 6-49 CLASS
    60 PSI
                                      CBC
                                     AUTO
CONTINUOUS
 INJECTION


   SPRAYS ALL THE TIME
   MIXTURE CONTROL UNIT
   FUEL DISTRIBUTOR
   CONTROL PRESSURE REGULATOR

                                  CBC
                                 AUTO
FUEL PRESSURE
 REGULATOR
         Used on TBI
          systems
         Provides constant
          fuel supply
         Fuel pressure on
          one side
         Fuel pressure opens
          regulator under a
          certain pressure.
         Spring is calibrated
                              CBC
                             AUTO
INJECTION SYSTEM
     SERVICE
    CHAPTER 6
   LAB MANUAL


                    CBC
                   AUTO
     SYSTEM CHECKS
 ADEQUATE AIR SUPPLY
 PRESSURIZED FUEL SUPPLY
 ADEQUATE TRIGGER SIGNAL
 NO VACUUM LEAKS
 GOOD IGNITION SYSTEM
 GOOD ENGINE MECHANICAL
 GOOD FUEL QUALITY
 PCM OPERATION
                             CBC
                            AUTO
FUEL DELIVERY
         Fuel Pump noises
         Does fuel pump
          run at all?
         Fuel filter
          condition?
         Connections to fuel
          pump


                             CBC
                            AUTO
       COMPONENT CHECKS
   AIR INDUCTION
   AIR FLOW SENSORS
   THROTTLE BODY
   FUEL SYSTEM
    CHECKS
   FUEL DELIVERY
   INJECTOR CHECKS
   INJECTOR           6-61 LAB
    CLEANING
                                   CBC
                                  AUTO
INERTIA SWITCH




                  CBC
                 AUTO
        INJECTOR TESTS
   ELECTRICAL OPERATION
    – VOLTAGE SIGNALS
    – SCOPE TESTING
   MECHANICIAL OPERATION
    – PINTLE OPERATION
    – BALANCE TEST
    – FLOW

                             CBC
                            AUTO
 CBC
AUTO

				
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posted:10/13/2012
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