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Home >> Jaguar >> 2019 >> XF S >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Engine System - General Information -- XE/(760)) >> Engine System - General Information >> Diagnosis And Testing >> Engine - V6 S/C 3.0L Petrol (G1829958) >> Symptom Chart

Symptom Chart

WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  1. If an engine is suspect, and the vehicle remains under the Manufacturers warranty refer to the Warranty Policy and Procedure information, or determine if any prior approval programme is in operation, prior to the installation of a new engine.
  2. 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
  1. Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index
Difficult to start hot and cold
  1. Carry out general engine checks:
    1. Perform the Inline diagnostic unit 2, relative compression test - V6 3.0L S/C Petrol
    2. Compression test. Refer to component tests in this article.
    3. Valve clearances
    4. Spark plug condition and color
Poor idle
  1. Ensure the air intake system is free from leaks
  2. Carry out general engine checks:
    1. Perform the Inline diagnostic unit 2, relative compression test - V6 3.0L S/C Petrol
    2. Compression test. Refer to component tests in this article.
    3. Valve clearances
    4. Spark plug condition and color
  3. Check for collapsed catalytic converter/blocked exhaust system
  4. Check long and short term fuel trim datalogger signals
    1. Readings up to 10%: may be considered as acceptable if the readings are equal bank to bank
    2. Positive readings of between 10-20%: check for air leaks in air intake system
    3. Negative readings of between 10-20%: check for over fuelling e.g. leaking injectors, high fuel pressure
    4. Readings above 20%: check for diagnostic trouble codes and refer to diagnostic trouble code index.
  5. Carry out a vacuum gauge check. Refer to component tests in this article
Insufficient power/Insufficient compression
  1. Ensure the air intake system is free from leaks
  2. Carry out general engine checks:
    1. Perform the Inline diagnostic unit 2, relative compression test - V6 3.0L S/C Petrol
    2. Compression test. Refer to component tests in this article.
    3. Valve clearances
    4. Spark plug condition and color
  3. Check for collapsed catalytic converter/blocked exhaust system
  4. Check long and short term fuel trim datalogger signals
    1. Readings up to 10%: may be considered as acceptable if the readings are equal bank to bank
    2. Positive readings of between 10-20%: check for air leaks in air intake system
    3. Negative readings of between 10-20%: check for over fuelling e.g. leaking injectors, high fuel pressure
    4. Readings above 20%: check for diagnostic trouble codes and refer to diagnostic trouble code index.
  5. Carry out a vacuum gauge check. Refer to component tests in this article
Oil consumption
  1. Carry out oil leak check followed by an oil consumption test. Refer to the component tests in this article
  2. If oil consumption is excessive:
  3. Check the integrity of the engine breather system
  4. Carry out general engine checks:
    1. Perform the Inline diagnostic unit 2, relative compression test - V6 3.0L S/C Petrol
    2. Compression test. Refer to component tests in this article.
    3. Valve clearances
    4. Spark plug condition and color
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