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ME(H4DOSTC)-92 MECHANICAL ENGINE TROUBLE IN GENERAL 3. Low output, hesitation and • Engine control system <Ref. to EN(H4DOSTC)-2, Basic Diagnostic Procedure.> A • Intake system • Loosened or cracked intake duct A • Loosened or cracked PCV hose A • Loosened or cracked vacuum hose B • Defective intake manifold gasket B • Defective throttle body gasket B • Defective PCV valve B • Loosened oil filler cap B • Dirty air cleaner element A • Fuel line • Defective fuel pump and relay B • Clogged fuel line B • Lack of or insufficient fuel C • Belt • Defective timing B • Compression • Incorrect valve clearance B • Loosened spark plugs or defective gasket B • Loosened cylinder head bolts or defective gasket B • Improper valve seating B • Defective valve stem C • Worn or broken valve spring B • Worn or stuck piston rings, cylinder and piston C • Incorrect valve timing A • Improper engine oil (low viscosity) B • Lubrication system • Incorrect oil pressure B • Cooling system • Overheating C • Over cooling C • Others • Malfunction of evaporative emission control system A 4. Surging • Engine control system <Ref. to EN(H4DOSTC)-2, Basic Diagnostic Procedure.> A • Intake system • Loosened or cracked intake duct A • Loosened or cracked PCV hose A • Loosened or cracked vacuum hose A • Defective intake manifold gasket B • Defective throttle body gasket B • Defective PCV valve B • Loosened oil filler cap B • Dirty air cleaner element B • Fuel line • Defective fuel pump and relay B • Clogged fuel line B • Lack of or insufficient fuel 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 C • Defective valve stem C • Worn or broken valve spring C • Worn or stuck piston rings, cylinder and piston C • Incorrect valve timing A • Improper engine oil (low viscosity) B • Cooling system • Overheating B • Others • Malfunction of evaporative emission control system C TROUBLE PROBLEM PARTS, ETC. POSSIBLE CAUSE RANK |