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12 ENGINE 4 FAULT DIAGNOSIS 3. Are fuel supply, tank, pump, ventilation and emission control systems in correct working See FUEL SYSTEM, Repair, Fuel Filter See FUEL SYSTEM, Repair, YES - Suspect valves held open by hydraulic tappets due to high oil pressure. See Engine Oil Pressure Test 4. Is oil pressure high? YES - Remove oil filter and cooler adaptor and check pressure relief valve strainer gauze See Description and operation, Description NO - Carry out cylinder compression tests to See Cylinder Compression - Test 5. Are cylinder compressions satisfactory? NO - See Repair, Cylinder Heads - Renew YES - Check brake vacuum connections. See BRAKES, Description and operation, Check heater/ventilation unit vacuum connections. 6. Are the brakes binding? YES - Investigate cause of binding. Continue. 7. Automatic Transmission only. Is the Torque Converter and Transmission operating correctly? If problem is not diagnosed: repeat tests starting at 1. Engine backfires into exhaust system 1. Are there any leaking joints/connections or holes in the exhaust system? See MANIFOLD AND EXHAUST SYSTEM, Repair, Exhaust System NO - Continue. 2. Is distributor fitted correctly, HT leads in correct firing order and routed correctly? See ELECTRICAL, Repair, Distributor - V8i YES - Continue. 3. Is air fuel ratio correct? NO - Check multiport fuel injection. See Electrical Trouble Shooting Manual. Check brake vacuum connections. See BRAKES, Description and operation, Brake See HEATING AND VENTILATION, Description and operation, See EMISSION CONTROL, Description and operation, Emission Control 4. Are cylinder compressions satisfactory? NO - Carry out compression test to check for See Cylinder Compression - Test See Repair, Cylinder Heads - Renew If problem is not diagnosed: repeat tests starting |