EFI Diagnostics


Why EFI Diagnosis

Test - Don't Guess…
In today's complex, computer controlled vehicles, EFI Diagnosis is essential. "Hit or Miss" approaches to fuel injection repairs result in lost time, high repair bills and dissatisfaction.  The expense of maintaining your vehicle means that guessing is not good enough!! You need your car repaired properly the first time.

Diagnostics Save Fuel & Money
A well-tuned engine operating in accordance to the manufacturer's specifications is a fuel efficient engine.  Fuel economy and low emissions go hand in hand.  With the fuel prices that they are today, it doesn't take long to realise significant savings from improved mileage in any vehicle.

Diagnostics Are Preventative
Even though your vehicle may appear to be running ok, broken or non-specified components can cause high emissions, poor driveability and poor fuel economy.  Correct diagnosis can determine if one or more components are defective and require adjustment, repair or replacement.  Regular diagnosis makes sense don't you think?

Diagnostics Are Make & Model Specific
EFI Diagnosing
When you bring your vehicle to De Jonge Mechanical Repairs, this is what we do:

  • Perform on-board computer testing specific to that make and model of vehicle to ensure the vehicle's engine management system is functioning correctly.
  • Perform a complete test of the vehicle's engine system to spot functions and components that are 'out-of-spec'.
  • Check the fuel pressure and flow rates.
  • Pin-point the problem areas using the oscilloscope and various other diagnostic equipment;
  • Re-test the vehicle after repairs are carried out to confirm that the vehicle's engine is operating to the manufacturer's specifications.

Electronic Fuel Injection
The Electronic Fuel Injection system fitted to most modern vehicles combines sophisticated computer controls with a high pressure fuel delivery system to provide optimum power and fuel efficiency. The system is controlled by an Electronic Control Unit (ECU).
These systems often have in excess of thirty different engine and emission sensors all sending information continually to the ECU.
The ECU then monitors the information from the sensors to ensure the correct amount of fuel and air is used to provide optimum fuel efficiency and performance and also to minimise exhaust emissions.
Common Problems
EFI problems can be caused by dirty fuel or a blocked injector.  Sometimes the fault has to be found somewhere within the EFI system using advanced diagnostic tools.  Common symptoms include; poor fuel economy, backfiring, 'running on' when the car is turned off and rough idling.

System Maintenance
Regular system cleans ensure peak efficiency.  Remember a tune up or service is maintenance for your vehicle and not a repair for a specific fault within an EFI system.  Please ensure you advise De Jonge Mechanical Repairs if you are experiencing any particular fault or problem as we are fully trained to carry out a complete EFI service and restore your engine back to its peak running condition using quality components from leading manufacturers such as Bosch and Injectronics.


Specialist Car Services