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CONDITION POSSIBLE CAUSES CORRECTION ENGINE HARD TO START, 6. Air in fuel system or the fuel supply 6. Check the flow through the filter and 7. Contaminated fuel. 7. Verify by operating the engine with 8. Fuel screen plugged. 8. Check fuel screen. 9. One or more injectors worn or not 9. Check/replace improperly operating 10. Worn or inoperative injection 10. Visually check fuel delivery with an 11. Injection pump out of time. 11. Check/Time the pump (refer to 12. Engine compression low. 12. Check compression to identify the 13. Camshaft out of time. 13. Check camshaft timing. ENGINE STARTS, BUT WILL 1. Cylinder heads heater plugs relay 1. Verify system is working. Repair/ 2. One or more cylinder head heater 2. Verify system is working. Repair/ 3. Intake air or exhaust system 3. Visually check for exhaust restriction 4. Air in the fuel supply system or the 4. Check flow through the filter and 5. Fuel waxing due to extremely cold 5. Verify by inspecting the fuel filter. 6. Contaminated fuel. 6. Verify by operating the engine with SURGING (SPEED 1. If the condition occurs at idle, the 1. Adjust the idle speed. 2. High pressure fuel leak. 2. Inspect/correct leaks in the high 3. One or more injectors worn or not 3. Check/replace the inoperative 4. Improperly operating injection pump. 4. Replace the injector pump. 9 - 4 ENGINE XJ DIAGNOSIS AND TESTING (Continued) 2000 JEEP CHEROKEE |