- Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics

1. Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) before using the symptom tables.
2. Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views ([1][2]Engine) , Engine Content Specifications (Specifications) , Engine Component Description (Description and Operation) , Lubrication Description (RPO LY2/LMF) (Description and Operation)Lubrication Description (RPO LY6) (Description and Operation) , and Camshaft Position Actuator and Solenoid Valve Description (Description and Operation).

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. For a detailed explanation, refer to Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview).

Visual/Physical Inspection

* Inspect for aftermarket devices which could affect the operation of the engine. Refer to Checking Aftermarket Accessories (Component Tests and General Diagnostics).
* 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 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 without Internal Engine Noises)
* Base Engine Misfire with Abnormal Internal Lower Engine Noises (Base Engine Misfire with Abnormal Internal Lower Engine Noises)
* Base Engine Misfire with Abnormal Valve Train Noise (Base Engine Misfire with Abnormal Valve Train Noise)
* Base Engine Misfire with Coolant Consumption (Base Engine Misfire with Coolant Consumption)
* Base Engine Misfire with Excessive Oil Consumption (Base Engine Misfire with Excessive Oil Consumption)
* Engine Noise on Start-Up, but Only Lasting a Few Seconds (Engine Noise on Start-Up, but Only Lasting a Few Seconds)
* Upper Engine Noise, Regardless of Engine Speed (Upper Engine Noise, Regardless of Engine Speed)
* Lower Engine Noise, Regardless of Engine Speed (Lower Engine Noise, Regardless of Engine Speed)
* Engine Noise Under Load (Engine Noise Under Load)
* Engine Will Not Crank - Crankshaft Will Not Rotate (Engine Will Not Crank - Crankshaft Will Not Rotate)
* Coolant in Combustion Chamber (Coolant in Combustion Chamber)
* Coolant in Engine Oil (Coolant in Engine Oil)
* Engine Compression Test (Testing and Inspection)
* Cylinder Leakage Test (Component Tests and General Diagnostics)
* Oil Consumption Diagnosis (Component Tests and General Diagnostics)
* Oil Pressure Diagnosis and Testing (Component Tests and General Diagnostics)
* Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing (Component Tests and General Diagnostics)
* Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing (Component Tests and General Diagnostics)
* Oil Leak Diagnosis (Component Tests and General Diagnostics)
* Crankcase Ventilation System Inspection/Diagnosis (Testing and Inspection)
* Drive Belt Chirping, Squeal, and Whine Diagnosis (Drive Belt Chirping, Squeal, and Whine Diagnosis)
* Drive Belt Rumbling and Vibration Diagnosis (Drive Belt Rumbling and Vibration Diagnosis)
* Drive Belt Falls Off and Excessive Wear Diagnosis (Drive Belt Falls Off and Excessive Wear Diagnosis)
* Drive Belt Tensioner Diagnosis (Testing and Inspection)