1. ELECTRONIC FUEL INJECTION COMPONENTS

2. THE FOLLOWING ARE THE MOST COMMON FUEL INJECTION COMPONENTS FOR MULTI PORT FUEL INJECTION STARTING AT THE GAS TANK!

3. ELECTRIC FUEL PUMPS
PURPOSE- PUMPS FUEL UNDER HIGH PRESSURE TO FUEL PRESSURE REGULATOR. THERE ARE THREE BASIC SYSTEMS: INTANK HIGH PRESSURE PUMP, FOR SINGLE GAS TANK APPPLICATIONS. FRAME MOUNTED HIGH PRESSURE PUMP, FOR SINGLE GAS TANK APPLICATIONS, AND LOW PRESSURE ELECTRIC FUEL PUMPS IN EACH GAS TANK
( PICK UP AND TRUCK APPLICATIONS ) AND A FRAME MOUNTED HIGH PRESSURE FUEL PUMP.
WHICH HAS A ELECTRIC SWITCHING VALVE MOUNTED ON THE FRAME RAIL IN FRONT OF THE PUMP.

4. IN TANK HIGH PRESSURE ELECTRIC FUEL PUMP, CAPABLE OF OVER 100psi.
WIRE TERMINALS
Fuel inlet
Fuel outlet

5. FRAME MOUNTED HIGH PRESSURE FUEL PUMP
CAPABLE OF over 100 psi.
ELECTRICAL
CONNECTOR
FUEL
INLET
FUEL OUTLET

6. FUEL TANK SWITCHING VALVE
TO FUEL PUMP & FUEL RETURN FROM REGULATOR
SOURCE
&
RETURN
TO ONE
OF THE
GAS
TANKS
SOURCE
&
RETURN
TO ONE
OF THE
GAS
TANKS

7. FUEL PRESSURE REGULATOR
PURPOSE - REGULATES FUEL PRESSURE TO MANUFACTURES SPECIFICATIONS, BY RETURNING EXCESS FUEL PRESSURE TO THE GAS TANK..

8. FUEL PRESSURE REGULATOR
AND FUEL RAIL
VACUUM HOSE
CONNECTION FUEL RAIL
FUEL
RETURN

9. INJECTORS AND FUEL RAIL PURPOSE - SUPPLIES FUEL UNDER REGULATED PRESSURE TO THE COMBUSTION CHAMBER OF EACH CYLINDER.

10. FUEL RAIL, INJECTORS, FUEL INLET AND PRESSURE REGULATOR
PRESSURE REGULATOR FUEL RETURN
FUEL
INLET
HIGH
PRESSURE
FUEL
RAIL
FUEL INJECTOR

11. FUEL RAIL, INJECTORS, AND SCHRADER VALVE FITTING FOR FUEL PRESSSURE
GAUGE.
FUEL RAIL
SCHRADER VALVE
INJECTOR

12. FUEL OUTLET - FUEL COMES OUT
TYPICAL FUEL INJECTOR
FUEL INLET
FROM FUEL
RAIL, USES
O-RINGS
FOR SEALS
ELECTRICAL CONNECTOR
FUEL OUTLET - FUEL COMES OUT
AS A VERY FINE MIST

13. THE FOLLOWING ARE ELECTRONIC FUEL INJECTION COMPONENTS FOR THE AIR INTAKE. STARTING AT THE AIR CLEANER.

14. MASS AIR FLOW SENSOR PURPOSE - MEASURES AIR SPEED AND DENSITY CHANGES THE RETURNING VOLTAGE SIGNAL TO THE E.C.M. ALLOWS FINE TUNE OF AIR / FUEL MIXTURE, NOT USED ON ALL CARS.

15. TOP VIEW AND INLET VIEWS OF
MASS AIR FLOW SENSORS
NOTE
DIRECTION
OF ARROW
INDICATES
AIR FLOW

16. VANE AIR FLOW SENSOR
PURPOSE - USED ON SOME IMPORTS TO DETERMINE AIR FLOW BY MOVING A DOOR WHICH CHANGES THE VOLTAGE GOING BACK TO THE E.C.M.

17. VANE AIR FLOW SENSOR IS A VARIABLE RESISTOR, IT VARIES RETURNING
VOLTAGE TO THE ECM, VOLTAGE CHANGES
WITH AIR FLOW
BOLTS TO
AIR
CLEANER
HOUSING.
INLET
AIR
OUTLET TO
MOTOR -
HOSE
MUST BE
CONNECTED

18. THROTTLE BODY PURPOSE - IS A DIRECT LINK TO THE GAS PEDAL - CONTROLS THE AMOUNT OF AIR GOING INTO THE ENGINE.

19. THROTTLE BODY / THROTTLE POSITION SENSOR & IDLE AIR CONTROL MOTOR
INLET VIEW
THROTTLE
LINKAGE -
ATTATCHES TO
CABLE
TPS
SWITCH
IDLE
AIR
CONTROL
MOTOR
IAC
AIR INLET FROM AIR CLEANER

20. TOP SIDE VIEW THROTTLE BODY IDLE AIR CONTROL & THROTTLE POSITION
SWITCH
IAC MOTOR
TPS SWITCH

21. TOP VIEW OF THROTTLE BODY
NAME THE COMPONENTS
A IS
B IS

22. THROTTLE POSITION SENSOR
PURPOSE - BY CHANGING THE VOLTAGE RETURNING TO THE COMPUTER IT ALLOWS THE COMPUTER TO TELL THE PERCENTAGE OF THROTTLE PLATE OPENING. MOUNTED OPOSITE OF THROTTLE CABLE ON THE THROTTLE BODY.

23. ( THROTTLE POSITION SENSOR )
TPS SWITCH
( THROTTLE POSITION SENSOR )
ELECTRICAL
CONNECTOR
MOUNTING
HOLES

24. BACK SIDE OF THROTTLE POSITION
SWITCH ( TPS ) SWITCH
HOLE FOR THROTTLE
SHAFT - THIS TURNS
AS YOU ACCELERATE

25. ( MAP SENSOR )
MANIFOLD AIR PRESSURE SENSOR PURPOSE - CHANGING VACUUM PRESSURE IN THE INTAKE MANIFOLD CHANGES THE AMOUNT OF VOLTAGE GOING BACK TO THE E.C.M. ALLOWS FOR FINE TUNING OF THE AIR - FUEL RATIO.

26. MAP SENSOR
VACUUM HOSE CONNECTION
ELECTRICAL CONNECTOR

27. BAROMETRIC PRESSURE SENSOR
PURPOSE - CHANGING AIR PRESSURE SUCH AS CHANGES IN WEATHER, TEMPERATURE, AND ELEVATION CHANGES THE VOLTAGE RETURNING TO THE E.C.M.

28. ( BAROMETRIC PRESSURE SENSOR )
BARO SENSOR
( BAROMETRIC PRESSURE SENSOR )
NO VACUUM HOSE ATTATCHED

29. IDLE AIR CONTROL MOTOR PURPOSE - IS A COMPUTER CONTROLED MOTOR THAT CAUSES A CONTROLED VACUUM LEAK FROM ONE SIDE OF THE THROTTLE BODY TO THE OTHER. IT IS MOUNTED ON THE THROTTLE BODY

30. IAC MOTORS ( IDLE AIR CONTROL ) PROVIDES A CONTROLED VACUUM LEAK
TO ADJUST IDLE SPEED.

31. INTAKE AIR TEMPERATURE SENSOR PURPOSE - THE VOLTAGE GOING BACK TO THE COMPUTER CHANGES WITH THE CHANGING AIR TEMPERATURE. ALLOWS FINE TUNING OF AIR TO FUEL RATIO. MOUNTED IN THE INTAKE MANIFOLD

32. INTAKE AIR TEMPERATURE SENSOR

33. ENGINE COOLANT TEMPERATURE SENSOR PURPOSE - THE VOLTAGE GOING BACK TO THE COMPUTER CHANGES WITH THE CHANGING COOLANT TEMPERATURE. DETERMINES WHEN THE E.C.M. GOES INTO CLOSED LOOP, ABOUT DEGRESS

34. ENGINE TEMPERATURE SENSOR USUALLY MOUNTED ON THE THERMOSTAT
HOUSING OR ON THE FRONT OF THE MOTOR
IN THE COOLANT FLOW

35. THERMOSTAT HOUSING AND ENGINE COOLANT TEMPERATRE SENSOR

36. OXYGEN SENSOR
PURPOSE - MONITORS THE AMOUNT OF OXYGEN IN THE EXHAUST. THE ENGINE MAY HAVE MORE THAN ONE. PRODUCES A VOLTAGE WHICH CHANGES WITH THE AMOUNT OF OXYGEN. MAY BE HEATED.

37. HEATED EXHAUST GAS OXYGEN SENSOR
HEGO
HEATED EXHAUST GAS OXYGEN SENSOR

38. SINGLE WIRE O2 SENSOR ( NOT HEATED )

39. KNOCK SENSOR PURPOSE - SENDS SIGNAL TO THE COMPUTER ( ECM ) WHEN IT DETECTS PINGING ( ENGINE KNOCK ) ECM WILL RETARD TIMING UNTILL IT STOPS. USUALLY MOUNTED ON THE SIDE OF THE ENGINE BLOCK.

40. KNOCK SENSOR TOP VIEW, SIDE VIEW,
AND BOTTOM VIEW
SINGLE WIRE
ELECTRICAL
CONNECTOR
SIDE VIEW
BOTTOM
VIEW
NOTE NO
HOLE
THREADS

41. EXHAUST GAS RECIRCULATION VALVE PURPOSE - RECIRCULATES EXHAUST GASES TO REBURN IN THE ENGINE. HELPS REDUCE EMISSIONS. MAY BE CONTROLED BY THE E.C.M.

42. TWO STYLES OF E.C.M. CONTROLED E.G.R. VALVES
( EXHAUST GAS RECIRCULATION VALVES )
ELECTRICAL CONNECTORS

43. MISCELLANEOUS FUEL INJECTION
COMPONENTS

44. PURPOSE - TO SHUT THE POWER OFF
INERTIA SWITCH ( FORD )
PURPOSE - TO SHUT THE POWER OFF
TO THE ELECTRIC FUEL PUMP, IN AN ACCIDENT
MAY BE ACCIDENTALY TRIPPED
ON A ROUGH ROAD OR?

45. E.F.I. FUEL FILTER PURPOSE TO
KEEP THE FUEL GOING TO
THE INJECTORS CLEAN

46. THE BRAINS
E.C.M. ELECTRONIC
CONTROL MODULE
WHAT IT CONTROLS
THE INJECTOR

47. THE PURPOSE OF ALL OF THE COMPONENTS
IS TO ALLOW THE E.C.M. TO ADJUST THE
AIR / FUEL RATIO TO OBTAIN THE MOST
POWER, THE BEST FUEL ECONOMY, AND
THE LEAST AMOUNT OF EMISSIONS

48. AN ALTERNATIVE FUEL INJECTION SYSTEM IS THE THROTTLE BODY FUEL
INJECTION SYSTEM. IT HAS LESS COMPONENTS
MAKES MORE POWER AT LOWER R.P.M.s AND GETS
LESS MILES PER GALLION OF GAS.

49. THROTTLE BODY FUEL INJECTION UNIT- MOUNTS THE SAME AS A CARBURETOR
FUEL INLETS AND OUTLETS
PRESSURE
REGULATOR
T.P.S.
SWITCH
INJECTORS

50. T.B.I. ( THROTTLE BODY FUEL INJECTION )
THE HEART OF THE SYSTEM IS THE T.B.I. UNIT
THE BRAINS OF THE SYSTEM IS THE E.C.M.
THIS SYSTEM HAS FEWER COMPONENTS, THAN
MULTI PORT E.F.I.