STANDARD PROCEDURE
CLEANING FUEL INJECTORS
NOTE: Before cleaning the injector recesses, seal the injector holes in the injector recesses with the appropriate pin to prevent debris from falling into the recesses and entering the motor.
1. Seal the injector holes inside the cylinder head recesses.
2. Wipe out injector recesses with a non-woven cloth, then clean with a cylinder brush.
3. Clean the bottom of the cylinder recess with a round brush.
4. Blow out the recess and clean again with a non-woven cloth and cover over.
5. Perform these steps for each injector recess.
NOTE: DO NOT clean the tip of the injector with a wire brush. Use a non - woven cloth.
6. Clean injector body with a wire brush.
7. Clean injector tips with a non-woven cloth.
NOTE: Do Not apply antiseize lubricant to the injector nozzle area.
8. Grease injector body with anti seize lubricant.
NOTE: Always replace the seals that seal off the injectors at the cylinder head to the combustion chamber and replace the retaining screws.
INJECTOR CLASSIFICATION
NOTE: Fuel Injectors have different flow rates. When ALL injectors are removed, re-enter all injector six digit codes. If more than one injector is replaced, remove the injector sticker on the front of the timing cover.
Classified injectors can be recognized by the six digit alpha-numeric code (2) on the magnetic head. The code corresponds to the classification stage. The classification stage may be checked against the fuel injector identification sticker (1) on the front of the timing cover. Number one cylinder will be the first six digits, number two cylinder will be the second six digits, and so on.
The classification of injectors describes the fuel flow quantity characteristic of the injector. This will make it possible in the future to match the engine software to the tolerances of the injector within a more narrowly graduated range. Classification can be clearly recognized, and assigned only by means of a scan tool.
These general conditions equally apply if, as a result of replacing an engine, carrying out repairs to the cylinder head etc., the cylinder selective assignment of the injectors or the engine control module assignment may have changed. If proper attention is not paid to the classification on these vehicles driveability and smoking concerns could result.
If an injector is replaced, it is then necessary to assign the classification code to the corresponding cylinder in the engine control module with the appropriate scan tool.
INJECTOR CLASSIFICATION PROCEDURE
1. Turn ignition switch “ON”.
2. Using the scan tool, select ENGINE then MISCELLANEOUS.
3. Select LEARN INJECTORS.
4. Using the up and down arrows, scroll to the appropriate injector.
5. Using the right and left arrows, set injector to proper classification code.
6. Once injectors are classified, cycle ignition to complete.