Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics

1. Perform a Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle 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 Locations , Engine Component Description (LFW) Description and OperationEngine Component Description (LFX) Description and Operation , Drive Belt System Description Description and Operation and Lubrication Description (LF1, LFW or LFX) 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 problem. 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.
* 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 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
* Engine Compression Test Testing and Inspection
* Oil Consumption Diagnosis Oil Consumption Diagnosis
* Oil Pressure Diagnosis and Testing Oil Pressure Diagnosis and Testing
* Oil Leak Diagnosis Oil Leak Diagnosis