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Engine - I6 3.2L Petrol - Engine Diagnosis and Testing Principles of Operation For a detailed description of the engine system, refer to the relevant Description and Operation section in the workshop Engine (303-01A Engine - I6 3.2L Petrol, Description and Operation). Inspection and Verification 1. Verify the customer concern. 1. 2. Visually inspect for obvious signs of mechanical or electrical damage. 2. Visual Inspection Mechanical Electrical Coolant leaks Fuses 3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step 3. 4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart. 4. Symptom Chart • NOTE: If an engine is suspect, when the vehicle remains under the Manufacturers warranty refer to the Warranty Policy • NOTE: Due to the possibility of loose carbon, that has become trapped between the valve face and seat, effecting the Symptom Action All engine related issues Check ECM for Diagnostic Trouble Codes (DTCs) and refer to DTC Index. Electronic Engine Controls (303-14A Electronic Engine Controls - I6 3.2L Petrol, Diagnosis and Testing). Difficult to start hot and Carry out general engine checks: - Compression test. Refer to component tests in this section. Valve Clearance Check (303-01A Engine - I6 3.2L Petrol, General Procedures). Poor idle Ensure the air intake system is free from leaks - Compression test. Refer to component tests in this section. Valve Clearance Check (303-01A Engine - I6 3.2L Petrol, General Procedures). Check for collapsed catalytic converter/blocked exhaust system - Readings up to 10%: may be considered as acceptable if the readings are equal Electronic Engine Controls (303-14A Electronic Engine Controls - I6 3.2L Petrol, Diagnosis and Testing). Carry out a vacuum gauge check. Refer to component tests in this section. Insufficient Ensure the air intake system is free from leaks - Compression test. Refer to component tests in this section. Valve Clearance Check (303-01A Engine - I6 3.2L Petrol, General Procedures). Check for collapsed catalytic converter/blocked exhaust system - Readings up to 10%: may be considered as acceptable if the readings are equal |