Our presentation will make you aware of all about fuel injectors. First of all let’s see what’s the work of fuel injectors and then after we’ll focus on the common fuel injector problems and how they affect the vehicle. In the last few slides you’ll see symptoms for replacing fuel injector, what are their causes and impacts on the vehicle.

3. Role Of Fuel Injector
Delivers the exact
amount of gasoline to
engine
Receives signal from
ECU
Gas pump delivers
pressurized gasoline to
fuel injectors

4. Fuel injector opens
the valve as
directed by ECU
Fuel Injector sprays
the fine gasoline to
intake manifold

5. What Are The common Fuel
Injector Problems ..????

6. Common
Fuel
Injector
Problems
Fuel injector
does not open
Fuel Injector
Leaks
Dirty
Fuel
injector

7. Dirty Fuel Injector

8. Dirty Fuel Injector
The Fuel additive
leaves a Residue

11. The Fuel injector gets clogged by the debris and
dirt come from fuel rail or supply line

12. What Happens To
vehicle ..???

14. Causes
Faulty
windings
Rusted fuel
injector

15. What Happens To vehicle
..???

16. Fuel injector does not close

17. Causes
Fuel additives

19. Fuel Injector Leaks

20. Causes
Over heating
of fuel injector
Sudden cooling
down of
injector

21. As a result , The fuel Injector does not
function properly

22. What are the Symptoms for replacing
Fuel Injector..???

23. Symptoms
Turbo
Troubles
Heat Soak
Fuel TrimsLack Of
Resistance
Restriction
Continued

24. Symptoms
Balance
Test
Failed
Vehicle
won’t
start
Longer
in Crank
Times

25. Restriction
A 8-10% restriction causes Misfire in
fuel injector
Results in draining the fuel more than actual
requirement

26. Turbo Troubles
In turbo-charged engines, engine damaging
detonation happens due to fuel injector

27. The detonation process
Engine needs fuel when it
is under boost

28. Heat Soak In Engine

29. Heat Soak In Engine

30. As engine is of no cooling airflow or fuel flow for cleaning the nozzle
The Process
Fuel residue leaves olefin after engineshuts down

31. Long and short term Fuel Trims

32. Causes
Weak fuel pump Plugged fuel filter

33. What Happens To vehicle
..???

34. The built up causes
less fuel pass to
cylinder
The drops of fuel
causes drops in
power resistance
Lack Of
Resistance

35. Longer Crank Times

36. Why It happens….

37. Balance Test Failed
Way of selecting the faulty
injector

38. Ways of balance test

39. Vehicle Won’t Start With Full Tank
Generally happens due to fuel
contamination

40. Symptoms of
fuel
contamination
Hard
starting
Stalling
Loss of
power
Poor Fuel
Economy
Cranking
no-start

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