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CONDITION POSSIBLE CAUSES CORRECTIONS MAIN BEARING NOISE 1. Insufficient oil supply. 1. (Refer to LUBRICATION & 2. Low oil pressure. 2. Check oil pump, if Ok, check rod 3. Thin or diluted oil. 3. Change oil and filter. 4. Excessive bearing clearance. 4. Replace as necessary. 5. Excessive end play. 5. Check thrust washers for wear. 6. Crankshaft journal out-of round. 6. Service or replace crankshaft. 7. Loose flywheel or torque 7. Tighten to correct torque DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE CONDITION POSSIBLE CAUSE CORRECTION ENGINE WILL NOT START 1. Weak battery 1. Charge or replace as necessary. 2. Corroded or loose battery 2. Clean and tighten battery 3. Faulty starter. 3. (Refer to 8 - ELECTRICAL/ 4. Incorrect spark plug gap. 4. (Refer to 8 - ELECTRICAL/ 5. Dirt or water in fuel system. 5. Clean system and replace fuel 6. Faulty fuel pump, relay or wiring. 6. (Refer to 9 - ENGINE - ENGINE STALLS OR ROUGH IDLE 1. Idle speed set to low. 1. (Refer to 9 - ENGINE - 2. Vacuum leak. 2. Inspect intake manifold and 3. Incorrect engine timing. 3. (Refer to 9 - ENGINE/VALVE 9 - 2460 ENGINE - 6.1L SERVICE INFORMATION LX |