Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics

1. Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) before using the symptom tables.
2. Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views (Locations), Engine Content Specifications (Engine Content Specifications), Engine Component Description (Engine Component Description), Lubrication Description (with Active Fuel Managment) (Description and Operation)Lubrication Description (without Active Fuel Management) (Description and Operation), Camshaft Position Actuator and Solenoid Valve Description (Description and Operation), and Cylinder Deactivation (Active Fuel Management) System 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 (Strategy Based Diagnosis).

Visual/Physical Inspection

* Inspect for aftermarket devices which could affect the operation of the engine. Refer to Checking Aftermarket Accessories (Checking Aftermarket Accessories).
* 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)
* Cylinder Deactivation (Active Fuel Management) System Diagnosis (Cylinder Deactivation (Active Fuel Management) System Diagnosis)
* Engine Compression Test (Testing and Inspection)
* Cylinder Deactivation (Active Fuel Management) System Compression Test (Cylinder Deactivation (Active Fuel Management) System Compression Test)
* Cylinder Leakage Test (Cylinder Leakage Test)
* Oil Consumption Diagnosis (Oil Consumption Diagnosis)
* Oil Pressure Diagnosis and Testing (Oil Pressure Diagnosis and Testing)
* Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing (Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing)
* Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing (Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing)
* Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing (Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing)
* Oil Leak Diagnosis (Oil Leak Diagnosis)
* 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)