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ME(H4SO)-92 MECHANICAL ENGINE TROUBLE IN GENERAL 5. Engine does not return to • Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.> A • Intake system • Loosened or cracked vacuum hose A • Others • Stuck or damaged throttle valve A • Accelerator cable out of adjustment B 6. Dieseling (Run-on) • Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.> A • Cooling system • Overheating B • Others • Malfunction of evaporative emission control system B 7. After burning in exhaust • Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.> A • Intake system • Loosened or cracked intake duct C • Loosened or cracked PCV hose C • Loosened or cracked vacuum hose B • Defective PCV valve B • Loosened oil filler cap C • Belt • Defective timing B • Compression • Incorrect valve clearance B • Loosened spark plugs or defective gasket C • Loosened cylinder head bolts or defective gasket C • Improper valve seating B • Defective valve stem C • Worn or broken valve spring C • Worn or stuck piston rings, cylinder and piston C • Incorrect valve timing A • Lubrication system • Incorrect oil pressure C • Cooling system • Over cooling C • Others • Malfunction of evaporative emission control system C 8. Knocking • Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.> A • Intake system • Loosened oil filler cap B • Belt • Defective timing B • Compression • Incorrect valve clearance C • Incorrect valve timing B • Cooling system • Overheating A 9. Excessive engine oil con- • Intake system • Loosened or cracked PCV hose A • Defective PCV valve B • Loosened oil filler cap C • Compression • Defective valve stem A • Worn or stuck piston rings, cylinder and piston A • Lubrication system • Loosened oil pump attaching bolts and defective B • Defective oil filler seal B • Defective crankshaft oil seal B • Defective rocker cover gasket B • Loosened oil drain plug or defective gasket B • Loosened oil pan fitting bolts or defective oil pan B TROUBLE PROBLEM PARTS, ETC. POSSIBLE CAUSE RANK |