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fuel injection
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CBCAUTO
FUEL INJECTION FUEL INJECTION SYSTEM OPERATIONSYSTEM OPERATION
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FUEL INJECTION TYPES 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
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TBI UNITTBI UNIT(SOMETIMES CALLED CFI)(SOMETIMES CALLED CFI)
FIRST STEP FROM CARBURETORS
SOME CARB CHARACTERISTICS
LOW PRESSURE MOVEABLE PINTLE PRESSURE IS
REGULATED SERVICEABLE
FIG 6-40 CLASS
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LOW PRESSURE LOW PRESSURE SYSTEMSYSTEM
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FUEL INLET AND FUEL INLET AND OUTLETOUTLET
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LOW PRESSURE FUEL LOW PRESSURE FUEL INJECTORINJECTOR
13-16 PSI TWO O-RINGS BALL PINTLE USED ON TBI
AND CFI SYSTEMS
MESH SCREEN EASY TO
REPLACE
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TWO INJECTOR SYSTEMTWO INJECTOR SYSTEM
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PORT FUELPORT FUEL INJECTION INJECTION
INJECTS AT EACH CYLINDER
HIGHER PRESSURE
FED OFF OF FUEL RAIL
MORE EFFICIENT OPERATION
MODES– MULTI-PORT– SEQUENTIAL
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PORT FUEL INJECTIONPORT FUEL INJECTION
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CENTRAL POINT CENTRAL POINT INJECTIONINJECTION
GM SYSTEM INJECTOR
LOCATED IN LOWER HALF OF INTAKE MANIFOLD
POPPET VALVES HIGH PRESSURE
60 PSI
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CONTINUOUSCONTINUOUS INJECTION INJECTION
SPRAYS ALL THE TIME MIXTURE CONTROL UNIT FUEL DISTRIBUTOR CONTROL PRESSURE REGULATOR
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FUEL PRESSURE FUEL PRESSURE REGULATORREGULATOR
Used on TBI systems
Provides constant fuel supply
Fuel pressure on one side
Fuel pressure opens regulator under a certain pressure.
Spring is calibrated
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INJECTION SYSTEM INJECTION SYSTEM SERVICESERVICE
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SYSTEM CHECKSSYSTEM CHECKS ADEQUATE AIR SUPPLY PRESSURIZED FUEL SUPPLY ADEQUATE TRIGGER SIGNAL NO VACUUM LEAKS GOOD IGNITION SYSTEM GOOD ENGINE MECHANICAL GOOD FUEL QUALITY PCM OPERATION
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FUEL DELIVERYFUEL DELIVERY Fuel Pump
noises Does fuel pump
run at all? Fuel filter
condition? Connections to
fuel pump
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COMPONENT CHECKSCOMPONENT CHECKS AIR INDUCTION AIR FLOW
SENSORS THROTTLE BODY FUEL SYSTEM
CHECKS FUEL DELIVERY INJECTOR CHECKS INJECTOR
CLEANING
6-61 LAB
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INERTIA SWITCHINERTIA SWITCH
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INJECTOR TESTSINJECTOR TESTS ELECTRICAL OPERATION
– VOLTAGE SIGNALS– SCOPE TESTING
MECHANICIAL OPERATION– PINTLE OPERATION– BALANCE TEST– FLOW