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Symptoms - Engine Mechanical

Strategy Based Diagnostics

  1. Perform a diagnostic system check before using the symptom tables, if applicable.
  2. Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views , Engine Component Description , Lubrication Description .

All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system problem. The diagnostic flow is the place to start when repairs are necessary.

Visual/Physical Inspection

    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Check for the correct oil level, proper oil viscosity, and correct filter application.
    • Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambient temperature, engine temperature, amount of engine warm-up time, and other specifics.
    • Compare the engine sounds, if applicable, to a known good engine and make sure you are not trying to correct a normal condition.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Base Engine Misfire without Internal Engine Noises
    •  Base Engine Misfire with Abnormal Internal Lower Engine Noises
    •  Base Engine Misfire with Abnormal Valve Train Noise
    •  Base Engine Misfire with Coolant Consumption
    •  Base Engine Misfire with Excessive Oil Consumption
    •  Upper Engine Noise, Regardless of Engine Speed
    •  Lower Engine Noise, Regardless of Engine Speed
    •  Engine Will Not Crank - Crankshaft Will Not Rotate
    •  Engine Compression Test
    •  Oil Consumption Diagnosis
    •  Oil Pressure Diagnosis and Testing
    •  Turbocharger Whine Noise
    •  Turbocharger Hissing Noise
    •  Turbocharger Oil Leak From Compressor Seal
    •  Turbocharger Oil Leak From Turbine Seal
    •  Turbocharger Lack of Oil Supply
    •  Drive Belt Chirping, Squeal, and Whine Diagnosis
    •  Drive Belt Rumbling and Vibration Diagnosis
    •  Drive Belt Falls Off and Excessive Wear Diagnosis
   


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