Symptom Chart

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NOTE:

If an engine is suspect, when the vehicle remains under the Manufacturers warranty refer to the Warranty Policy and Procedure manual (section B1.2), or determine if any prior approval program is in operation, prior to the installation of a new engine.
Due to the possibility of loose carbon, that has become trapped between the valve face and seat, effecting the pressure readings, when carrying out a compression test and some cylinders are found to have low pressures, install the spark plugs, road test the vehicle and re-test the suspect cylinders. If the correct pressures are restored, no further action is required.

SYMPTOM	ACTION
All engine related issues	Check ECM for Diagnostic Trouble Codes (DTCs) and refer to DTC Index.
Difficult to start hot and cold	Carry out general engine checks: Compression test. Refer to component tests in this section. Valve clearances Spark plug condition and color
Poor idle	Ensure the air intake system is free from leaks Carry out general engine checks: Compression test. Refer to component tests in this section. Valve clearances Spark plug condition and color Check for collapsed catalytic converter/blocked exhaust system Check long and short term fuel trim datalogger signals Readings up to 10%: may be considered as acceptable if the readings are equal bank to bank Positive readings of between 10-20%: check for air leaks in air intake system Negative readings of between 10-20%: check for over fuelling e.g. leaking injectors, high fuel pressure Readings above 20%: check for DTCs and refer to DTC Index. Carry out a vacuum gauge check. Refer to component tests in this section
Insufficient power/Insufficient compression	Ensure the air intake system is free from leaks Carry out general engine checks: Compression test. Refer to component tests in this section. Valve clearances Spark plug condition and color Check for collapsed catalytic converter/blocked exhaust system Check long and short term fuel trim datalogger signals Readings up to 10%: may be considered as acceptable if the readings are equal bank to bank Positive readings of between 10-20%: check for air leaks in air intake system Negative readings of between 10-20%: check for over fuelling e.g. leaking injectors, high fuel pressure Readings above 20%: check for DTCs and refer to DTC Index. Carry out a vacuum gauge check. Refer to component tests in this section
Oil consumption	Carry out oil leak check followed by an oil consumption test. Refer to the component tests in this section If oil consumption is excessive: Check the integrity of the engine breather system Carry out general engine checks: Compression test. Refer to component tests in this section. Valve clearances Spark plug condition and color
Noise	Refer to the Special Service Messages on the Electronic Product Quality Report (EPQR) system for sound files. If the symptom does NOT compare to any of the sound files, contact Dealer Technical Support (DTS)