GLASS 4865426 - Caterpillar

Probable Causes
Diagnostic codes
Unit injectors
Valve lashRecommended Actions
Diagnostic Codes
Check for active diagnostic codes on the Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure.Unit Injectors
Check the connectors at the Electronic Control Module (ECM). Check for correct installation of the J1/P1 and J2/P2 ECM connectors. Also, thoroughly inspect the unit injector wiring harness from the ECM to the J300/P300 valve cover entry connector. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM.
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that may be misfiring. Refer to Troubleshooting, "Injector Solenoid Circuit - Test" for additional information.Valve Lash
Check the engine valve lash settings. Check damage to valve train components which may cause excessive valve lash. Repair any problems that are found. Refer to Troubleshooting, "Excessive Valve Lash".