Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 2 - Engine Section (H4DOTC) MECHANICAL Engine Trouble in General

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Engine Trouble in General


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                                      ENGINE TROUBLE IN GENERAL
MECHANICAL

25.Engine Trouble in General
A: INSPECTION
NOTE:
"RANK" shown in the chart refers to the possibility of reason for the trouble in order ("Very often" to "Rarely")
A -- Very often
B -- Sometimes
C -- Rarely

         TROUBLE                   PROBLEM PARTS, ETC.                           POSSIBLE CAUSE                    RANK
1. Engine will not start.
1) Starter does not turn.       Starter                         Defective battery-to-starter harness                B
                                                                Defective starter switch                            C
                                                                Defective inhibitor switch or neutral switch        C
                                                                Defective starter                                   B
                                Battery                         Poor terminal connection                            A
                                                                Run-down battery                                    A
                                                                Defective charging system                           B
                                Excessive friction              Seizure of crankshaft and connecting rod bearing    C
                                                                Seized camshaft                                     C
                                                                Seized or stuck piston and cylinder                 C
2) Initial combustion does      Starter                         Defective starter                                   C
not occur.                      Engine control system            A
                                Fuel line                       Defective fuel pump and relay                       A
                                                                Lack of or insufficient fuel                        B
                                Timing belt                     Defective (deterioration, etc.)                     B
                                                                Defective timing                                    B
                                Compression                     Incorrect valve clearance                           C
                                                                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                         B
                                                                Worn or stuck piston rings, cylinder and piston     C
                                                                Incorrect valve timing                              B
                                                                Improper engine oil (low viscosity)                 B
3) Initial combustion occurs.   Engine control system            A
                                Intake system                   Defective intake manifold gasket                    B
                                                                Defective throttle body gasket                      B
                                Fuel line                       Defective fuel pump and relay                       C
                                                                Clogged fuel line                                   C
                                                                Lack of or insufficient fuel                        B
                                Timing belt                     Defective (deterioration, etc.)                     B
                                                                Defective timing                                    B
                                Compression                     Incorrect valve clearance                           C
                                                                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                         B
                                                                Worn or stuck piston rings, cylinder and piston     C
                                                                Incorrect valve timing                              B
                                                                Improper engine oil (low viscosity)                 B

                                                   ME(H4DOTC)-98
                                       ENGINE TROUBLE IN GENERAL
                                                                                                                MECHANICAL

         TROUBLE                     PROBLEM PARTS, ETC.                            POSSIBLE CAUSE                    RANK
4) Engine stalls after initial   Engine control system              A
combustion.                      Intake system                   Loosened or cracked intake duct                       B
                                                                 Loosened or cracked PCV hose                          C
                                                                 Loosened or cracked vacuum hose                       C
                                                                 Defective intake manifold gasket                      B
                                                                 Defective throttle body gasket                        B
                                                                 Dirty air cleaner element                             C
                                 Fuel line                       Clogged fuel line                                     C
                                                                 Lack of or insufficient fuel                          B
                                 Timing belt                     Defective (deterioration, etc.)                       B
                                                                 Defective timing                                      B
                                 Compression                     Incorrect valve clearance                             C
                                                                 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                           B
                                                                 Worn or stuck piston rings, cylinder and piston       C
                                                                 Incorrect valve timing                                B
                                                                 Improper engine oil (low viscosity)                   B
2. Rough idle and engine         Engine control system              A
stall                            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
                                 Timing belt                     Defective timing                                      C
                                 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       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
                                 Others                          Malfunction of evaporative emission control system    A
                                                                 Stuck or damaged throttle valve                       B
                                                                 Accelerator cable out of adjustment                   C




                                                    ME(H4DOTC)-99
                                      ENGINE TROUBLE IN GENERAL
MECHANICAL

         TROUBLE                    PROBLEM PARTS, ETC.                            POSSIBLE CAUSE                    RANK
3. Low output, hesitation and   Engine control system              A
poor acceleration               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
                                Timing 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              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
                                Timing 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




                                                  ME(H4DOTC)-100
                                     ENGINE TROUBLE IN GENERAL
                                                                                                              MECHANICAL

         TROUBLE                   PROBLEM PARTS, ETC.                             POSSIBLE CAUSE                     RANK
5. Engine does not return to   Engine control system                A
idle.                          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                A
                               Cooling system                  Overheating                                             B
                               Others                          Malfunction of evaporative emission control system      B
7. Afterburning in exhaust     Engine control system                A
system                         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
                               Timing 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                A
                               Intake system                   Loosened oil filler cap                                 B
                               Timing 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
sumption                                                       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 gas-    B
                                                               ket
                                                               Defective oil filter o-ring                             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




                                                 ME(H4DOTC)-101
                                   ENGINE TROUBLE IN GENERAL
MECHANICAL

        TROUBLE                 PROBLEM PARTS, ETC.                            POSSIBLE CAUSE                  RANK
10. Excessive fuel consump- Engine control system            A
tion                        Intake system                   Dirty air cleaner element                           A
                            Timing 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     B
                                                            Incorrect valve timing                              B
                            Lubrication system              Incorrect oil pressure                              C
                            Cooling system                  Over cooling                                        C
                            Others                          Accelerator cable out of adjustment                 B




                                               ME(H4DOTC)-102



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