Index Subaru Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year
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ME(STI)-110 Engine Trouble in General MECHANICAL 3. Low output, hesitation and Engine control system <Ref. to EN(H4DOTC)(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 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 fuel or insufficient fuel C Timing belt Defective timing B Compression Incorrect valve clearance B Loosened spark plug or defective gasket B Loosened cylinder head bolt or defective cylinder head B Improper valve sealing 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 Over-heating C Over-cooling C Others Evaporative emission control system malfunction A Symptoms Problem parts etc. Possible cause RANK |