|
|
|
SERVICE DIAGNOSIS—GASOLINE ENGINES PERFORMANCE DIAGNOSIS CHART—GASOLINE ENGINES CONDITION POSSIBLE CAUSES CORRECTION ENGINE WILL 1. Weak or dead battery 1. Charge/Replace Battery. Refer to Group 8A, 2. Corroded or loose battery 2. Clean/tighten suspect battery/starter connections 3. Faulty starter or related circuit(s) 3. Check starting system. Refer to Group 8B, 4. Seized accessory drive 4. Remove accessory drive belt and attempt to start 5. Engine internal mechanical 5. Refer to Group 9, Engine, for correct diagnostics/ ENGINE CRANKS 1. No spark 1. Check for spark. Refer to Group 8D, Ignition 2. No fuel 2. Perform fuel pressure test, and if necessary, 3. Low or no engine compression 3. Perform cylinder compression pressure test. Refer ENGINE LOSS OF 1. Worn or burned distributor rotor 1. Install new distributor rotor 2. Worn distributor shaft 2. Remove and repair distributor (Refer to Group 8D, 3. Worn or incorrect gapped spark 3. Clean plugs and set gap. (Refer to Group 8D, 4. Dirt or water in fuel system 4. Clean system and replace fuel filter 5. Faulty fuel pump 5. Install new fuel pump 6. Incorrect valve timing 6. Correct valve timing 7. Blown cylinder head gasket 7. Install new cylinder head gasket 8. Low compression 8. Test cylinder compression 9. Burned, warped, or pitted valves 9. Install/Reface valves as necessary 10. Plugged or restricted exhaust 10. Install new parts as necessary 11. Faulty ignition cables 11. Replace any cracked or shorted cables 12. Faulty ignition coil 12. Test and replace, as necessary (Refer to Group ENGINE STALLS 1. Carbon build-up on throttle plate 1. Remove throttle body and de-carbon. (Refer to 2. Engine idle speed too low 2. Check Idle Air Control circuit. (Refer to Group 14, 9 - 142 5.9L ENGINE DN DIAGNOSIS AND TESTING (Continued) |