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966H engine unstable


I have a CAT 966H loader serial # A6G03785 which suddenly the engine became unstable and it sounds like the rpm is going up and down but while checking with ET adapter I found no change in the RPM readings. The only values that are changing are the following:

- Fuel Pressure: from 77 psi to Abnormal/incorrect data
- Fuel Pressure (absolute): from 92 psi to Abnormal/incorrect data
- Turbo Inlet Pressure (absolute): from 14.90 psi to Abnormal/incorrect data