Symptom Chart

SYMPTOM	POSSIBLE CAUSES	ACTION
Engine starting poor/difficult - Engine hot or cold	Engine system fault Engine mechanical fault	Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index Perform general engine checks: Perform the Inline diagnostic unit 2, relative compression test - V8 5.0L S/C Petrol Compression test. Refer to component tests in this section Valve clearances Spark plug condition and color
Engine idle poor	Engine system fault Intake system leak Engine mechanical fault Exhaust system restricted Intake/fuel system fault	Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index Check the intake system for leaks. Rectify as necessary Perform general engine checks: Perform the Inline diagnostic unit 2, relative compression test - V8 5.0L S/C Petrol Compression test. Refer to component tests in this section Valve clearances Spark plug condition and color Carry out a vacuum gauge check. Refer to component tests in this section Check the exhaust system for restrictions or blockages. Rectify as necessary Using the Jaguar Land Rover approved diagnostic equipment, check datalogger signals for long term and short term fuel trim 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 in section 100-00
Engine performance poor	Engine system fault Intake system leak Engine mechanical fault Exhaust system restricted Intake/fuel system fault	Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index Check the intake system for leaks. Rectify as necessary Perform general engine checks: Perform the Inline diagnostic unit 2, relative compression test - V8 5.0L S/C Petrol Compression test. Refer to component tests in this section Valve clearances Spark plug condition and color Carry out a vacuum gauge check. Refer to component tests in this section Check the exhaust system for restrictions or blockages. Rectify as necessary Using the Jaguar Land Rover approved diagnostic equipment, check datalogger signals for long term and short term fuel trim 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 in section 100-00
Engine oil consumption excessive	Engine oil leak Positive crankcase ventilation system leaking/blocked Engine mechanical fault	Check for engine oil leaks. Rectify as necessary Check the integrity of the positive crankcase ventilation system. Rectify as necessary Perform an engine oil consumption test. Refer to the component tests in this section. If oil consumption is excessive, perform general engine checks: Perform the Inline diagnostic unit 2, relative compression test - V8 5.0L S/C Petrol Compression test. Refer to component tests in this section Valve clearances Spark plug condition and color Carry out a vacuum gauge check. Refer to component tests in this section