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CONDITION POSSIBLE CAUSE CORRECTION ENGINE MISSES ON 1. Spark plugs dirty or incorrectly 1. (Refer to 8 - ELECTRICAL/ 2. Dirt in fuel system. 2. Clean fuel system. 3. Burned, warped or pitted valves. 3. Replcae as necessary. 4. Faulty coil. 4. (Refer to 8 - ELECTRICAL/ ENGINE MISSES AT HIGH SPEED 1. Spark plugs dirty or incorrectly 1. (Refer to 8 - ELECTRICAL/ 2. Faulty coil. 2. (Refer to 8 - ELECTRICAL/ 3. Dirt or water in fuel system. 3. Clean system and replace fuel DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - MECHANICAL CONDITION POSSIBLE CAUSES CORRECTIONS NOISY VALVES 1. High or low oil level in 1. (Refer to LUBRICATION & 2. Thin or diluted oil. 2. Change oil and filter. 3. Low oil pressure. 3. Check oil pump, if Ok, check rod 4. Dirt in lash adjusters. 4. Replace as necessary. 5. Worn rocker arms. 5. Replace as necessary. 6. Worn lash adjusters 6. Replace as necessary. 7. Worn valve guides. 7. (Refer to 9 - ENGINE/CYLINDER 8. Excessive runout of valve seats 8. (Refer to 9 - ENGINE/CYLINDER 9 - 1296 ENGINE - 4.7L SERVICE INFORMATION WK |