Symptoms - Engine Mechanical
Strategy Based Diagnostics
- Perform the Diagnostic System Check - Vehicle before using the symptom tables, if applicable.
- Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views , Engine Component Description , and 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 condition. The diagnostic flow is the place to start when repairs are necessary.
Visual/physical Inspection
| • | Inspect for aftermarket devices which could affect the operation of the engine. |
| • | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. |
| • | Inspect 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 ensure 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 |
| • | Engine Noise on Start-Up, but Only Lasting a Few Seconds |
| • | Upper Engine Noise, Regardless of Engine Speed |
| • | Lower Engine Noise, Regardless of Engine Speed |
| • | Engine Will Not Crank - Crankshaft Will Not Rotate |
| • | Coolant in Combustion Chamber |
| • | Turbocharger Whine Noise |
| • | Turbocharger Hissing Noise |
| • | Turbocharger Oil Leak From Compressor Seal |
| • | Turbocharger Oil Leak From Turbine Seal |
| • | Turbocharger Lack of Oil Supply |
| • | Oil Consumption Diagnosis |
| • | Oil Pressure Diagnosis and Testing |
| • | Crankcase Ventilation System Inspection/Diagnosis |
| • | Drive Belt Chirping, Squeal, and Whine Diagnosis |
| • | Drive Belt Rumbling and Vibration Diagnosis |
| • | Drive Belt Falls Off and Excessive Wear Diagnosis |
| • | Drive Belt Tensioner Diagnosis |
