movie 125 s afi Werkstatthandbuch : Seite 181

          1. GENERAL INFORMATION                                                      Movie S 125i

 TROUBLESHOOTING
 ENGINE WILL NOT START OR IS HARD TO START

                                                          Possible cause

1. Check for operation of the fuel pump     Abnormal      Faulty fuel pump


   Normal


2. Inspect the fuel flow                    Abnormal      Faulty pressure regulator


   Normal


3. Inspect the fuel injector               Abnormal       Faulty injector

   Normal


4. Perform spark test               Weak or no spark      Faulty spark plug
                                                          Fouled spark plug
                                                          Faulty ECU
   Good spark                                             Broken or shorted spark plug wire
                                                          Faulty ignition switch
                                                          Faulty ignition pulse generator
                                                          Loose or disconnected spark plug
                                                          wire

5. Test cylinder compression        Low compression       Valve stuck open
                                                          Worn cylinder and piston ring
                                                          Damaged cylinder head gasket
   Compression normal                                     Seized valve
                                                          Improper valve timing


6. Starting following normal procedure     Engine start   Intake pipe leaking
                                           but stop       Improper ignition timing (Faulty
                                                          ignition coil or ignition pulse
                                                          generator)
   Engine does not start                                  Fuel contaminated


7. Remove and inspect spark plug            Wet plug      Throttle valve open
                                                          Clogged air cleaner




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