fuel injection sys..PPT
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Transcript of fuel injection sys..PPT
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FUEL INJECTION SYSTEM OPERATIONBy Melodias Ben Hur Jr.
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FUEL INJECTION TYPES THROTTLE BODY INJECTION (TBI)INJECTED ABOVE THROTTLE PLATESSINGLE INJECTORCENTRAL PORT INJECTION (CFI)INJECTED ABOVE THROTTLE PLATESUSUALLY MORE THAN ONE INJECTORPORT FUEL INJECTION (PFI)INJECTORS IN INTAKE RUNNERS
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TBI UNIT(SOMETIMES CALLED CFI)FIRST STEP FROM CARBURETORSSOME CARB CHARACTERISTICSLOW PRESSUREMOVEABLE PINTLEPRESSURE IS REGULATEDSERVICEABLEFIG 6-40 CLASS
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LOW PRESSURE SYSTEM
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FUEL INLET AND OUTLET
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LOW PRESSURE FUEL INJECTOR13-16 PSITWO O-RINGSBALL PINTLEUSED ON TBI AND CFI SYSTEMSMESH SCREENEASY TO REPLACE
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TWO INJECTOR SYSTEM
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PORT FUEL INJECTIONINJECTS AT EACH CYLINDERHIGHER PRESSUREFED OFF OF FUEL RAILMORE EFFICIENT OPERATIONMODESMULTI-PORTSEQUENTIAL
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PORT FUEL INJECTION
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CENTRAL POINT INJECTIONGM SYSTEMINJECTOR LOCATED IN LOWER HALF OF INTAKE MANIFOLDPOPPET VALVESHIGH PRESSURE 60 PSIFIG 6-49 CLASS
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CONTINUOUS INJECTIONSPRAYS ALL THE TIMEMIXTURE CONTROL UNITFUEL DISTRIBUTORCONTROL PRESSURE REGULATOR
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FUEL PRESSURE REGULATORUsed on TBI systems Provides constant fuel supplyFuel pressure on one sideFuel pressure opens regulator under a certain pressure.Spring is calibrated
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INJECTION SYSTEM SERVICECHAPTER 6LAB MANUAL
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SYSTEM CHECKSADEQUATE AIR SUPPLYPRESSURIZED FUEL SUPPLYADEQUATE TRIGGER SIGNALNO VACUUM LEAKSGOOD IGNITION SYSTEMGOOD ENGINE MECHANICAL GOOD FUEL QUALITYPCM OPERATION
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FUEL DELIVERYFuel Pump noisesDoes fuel pump run at all?Fuel filter condition?Connections to fuel pump
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COMPONENT CHECKSAIR INDUCTIONAIR FLOW SENSORSTHROTTLE BODYFUEL SYSTEM CHECKSFUEL DELIVERYINJECTOR CHECKSINJECTOR CLEANING6-61 LAB
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INERTIA SWITCH
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INJECTOR TESTSELECTRICAL OPERATIONVOLTAGE SIGNALSSCOPE TESTINGMECHANICIAL OPERATIONPINTLE OPERATIONBALANCE TESTFLOW