FIAT 124 Spider Engine Maintenance and Modification

4.10 Diagnostics and Troubleshooting … Weber carburetors were installed on vehicles ranging from small and troubleshooting …. Fuel Injection systems and Carburetors have a common goal – to reach an air to fuel ratio of 14.7:1 and maintain that ratio through changing engine loads.

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FIAT 124 Spider Engine Maintenance and Modification

  • 1. Introduction …5
  • 2. Concepts…6
  • 2.1 The Otto Cycle …6
  • 2.2 Lambda …6
  • 2.3 Carburetor …7
  • 2.4 Fuel Injection (FI or EFI) …7
  • 2.5 Compression Ratio (CR)…7
  • 2.6 Home Mechanic…8
  • 2.7 Shop Manuals and Guides …8
  • 3. Engine Identification …9
  • 4. Carburetion …11
  • 4.1 Understanding Carburetors…11
  • 4.2 Air Bleed Correction…12
  • 4.3 Idle Speed Control …13
  • 4.4 Transition…13
  • 4.5 Acceleration Pump…14
  • 4.6 Cold Starting…15
  • 4.7 Multi-Barrel Synchronization …16
  • 4.8 Carburetor Identification and Schematics …18
  • 4.9 Carburetor Tuning …35
  • 4.10 Diagnostics and Troubleshooting…36
  • 5. Fuel Injection…38
  • 5.1 Fuel injection Basics …39
  • 5.2 The Air Flow Meter and Fuel Pump …40
  • 5.3 Cold Starting Components…41
  • 5.4 Warm-Up Components …42
  • 5.5 Idle Speed Control Components…42
  • 5.6 Cruising, Accelerating, and Deceleration Modes …43
  • 5.7 The Oxygen Sensor …44
  • 5.8 Other Components …44
  • 5.9 Component Reference…45
  • 5.10 Fuel Injection Tuning…48
  • 5.11 Fuel Injection System Electrical Diagrams…50
  • 5.12 Fuel Injection System Part Numbers …53
  • 5.13 Diagnostics and Troubleshooting…54
  • 6. The Cylinder Head …59
  • 6.1 Cylinder Head Identification …61
  • 7. Intake Manifolds …63
  • 8. Exhaust System…64
  • 8.1 Exhaust System Identification …64
  • 9. Ignition …66
  • 9.1 Ignition Components…66
  • 9.2 Ignition System Identification …67
  • 9.3 Ignition Advance …68
  • 9.4 Firing Order and Initial Timing …69
  • 9.5 Ignition Electrical Diagrams…72
  • 9.6 Diagnostics and Troubleshooting…74
  • 10. The Major Tune Up…76
  • 10.1 Preparation…76
  • 10.2 Tuning Procedure…79
  • 11. Improvements*…80
  • 11.1 Cylinder Head Improvements …81
  • 11.2 Intake Manifolds …84
  • 11.3 Ignition …84
  • 11.4 Exhaust and Emissions Control …86
  • 11.5 Carburetors …87
  • Figures …89
  • Tables …90

 

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