Delphi-Common Rail System – Identification number (fuel injector correction factor)
Example of an identification number on the fuel injector of the Ford Mondeo
Inside the hydraulic servo system there are various restrictions with extremely small diameters which have specific manufacturing tolerances.
These manufacturing tolerances are given as part of an identification number which is located on the outside of the fuel injector.
To ensure optimum fuel metering, the IDM must be informed without fail of a change of fuel injector. This is achieved by entering the identification number into the IDM using the WDS, ensuring in the process that the number is paired with the corresponding cylinder.
Note: If the identification numbers are not entered properly with WDS, the following faults can occur:
• Increased black smoke emissions,
• Irregular idling,
• Increased combustion noise.
Effects of faulty fuel injector(s) (mechanical faults)
Increased black smoke production
Fuel injector leaks
Increased combustion noise as a result of coked injector needles