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ME(H4SO 2.0)-91 MECHANICAL Engine Trouble in General 2. Rough idle and engine Engine control system <Ref. to EN(H4SO 2.0)(diag)-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 C Loosened oil filler cap B Dirty air cleaner element C Fuel line Defective fuel pump and relay C Clogged fuel line C Lack of or insufficient fuel B Belt Defective timing C Compression Incorrect valve clearance B Loosened spark plug or defective gasket B Loosened cylinder head bolt or defective gasket B Improper valve sealing B Defective valve stem C Worn or broken valve spring B Worn or stuck piston rings, cylinder and piston B Incorrect valve timing A Improper engine oil (low viscosity) B Lubrication system Incorrect oil pressure B Defective rocker cover gasket C Cooling system Overheating C Other Evaporative emission control system malfunction A Stuck or damaged throttle valve B Symptom Problem parts, etc. Possible cause Rank |