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Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics


1. Perform a Diagnostic System Check - Vehicle before using the symptom tables, if applicable.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Disassembled Views , Engine Component Description (LF1, LFW or LFX ) Engine Component Description (LAU or LBW) , Drive Belt System Description and Lubrication Description (LF1, LFW or LFX) Lubrication Description (LAU) .


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 .

Visual/Physical Inspection


• Inspect for aftermarket devices which could affect the operation of the engine. Refer to Checking Aftermarket Accessories .

• Inspect for easily accessible or visible system components for obvious damage or conditions which may 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 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 Noise Under Load

• Engine Will Not Crank - Crankshaft Will Not Rotate

• Engine Compression Test

• Oil Consumption Diagnosis

• Oil Pressure Diagnosis and Testing

• Oil Leak Diagnosis