Symptoms - Engine Mechanical (5.3L)

Symptoms - Engine Mechanical (5.3L)

Strategy Based Diagnostics

1. Perform a 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 (5.3L) ([1][2]Diagrams), Engine Component Description (5.3L) (Engine Component Description (5.3L)), Lubrication Description - Main Pressure Below 55 psi with Cylinder Deactivation (Active Fuel Management) Off (5.3L) (Lubrication Description - Main Pressure Below 55 psi with Cylinder Deactivation (Active Fuel Management) Off (5.3L)) , Lubrication Description - Main Pressure Above 55 psi with Cylinder Deactivation (Active Fuel Management) Off (5.3L) (Lubrication Description - Main Pressure Above 55 psi with Cylinder Deactivation (Active Fuel Management) Off (5.3L)) , Lubrication Description - Main Pressure Below 55 psi with Cylinder Deactivation (Active Fuel Management) On (5.3L) (Lubrication Description - Main Pressure Below 55 psi with Cylinder Deactivation (Active Fuel Management) On (5.3L)) , Lubrication Description - Main Pressure Above 55 psi with Cylinder Deactivation (Active Fuel Management) On (5.3L) (Lubrication Description - Main Pressure Above 55 psi with Cylinder Deactivation (Active Fuel Management) On (5.3L)) , Cylinder Deactivation (Active Fuel Management) System Description (Cylinder Deactivation (Active Fuel Management) System Description) , and Drive Belt 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 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 (5.3L) (Base Engine Misfire without Internal Engine Noises (5.3L))
* 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 (5.3L) (Base Engine Misfire with Abnormal Valve Train Noise (5.3L))
* 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 (5.3L) (Upper Engine Noise, Regardless of Engine Speed (5.3L))
* 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 (5.3L) (Cylinder Deactivation (Active Fuel Management) System Diagnosis)
* Engine Compression Test (Testing and Inspection)
* Cylinder Deactivation (Active Fuel Management) System Compression Test (5.3L) (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 (5.3L) (Oil Pressure Diagnosis and Testing (5.3L))
* Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing (5.3L) (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)
* 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)