FIAT Uno 45 - Manual (Page 80)

Fault finding - mechanical breaker ignition system
Ignition system 4•9
4
Engine fails to start
Ⅵ Ⅵ Loose battery connections
Ⅵ Ⅵ Discharged battery
Ⅵ Ⅵ Oil in contact points
Ⅵ Ⅵ Disconnected ignition leads
Ⅵ Ⅵ Faulty condenser
Engine overheats, lacks power
Ⅵ Ⅵ Seized distributor weights
Ⅵ Ⅵ Perforated vacuum pipe
Ⅵ Ⅵ Incorrect ignition timing
Engine starts and runs but misfires
Ⅵ Ⅵ Faulty spark plug
Ⅵ Ⅵ Cracked distributor cap
Ⅵ Ⅵ
Cracked rotor arm
Ⅵ Ⅵ Worn advance mechanism
Ⅵ Ⅵ Incorrect spark plug gap
Ⅵ Ⅵ Incorrect contact points gap
Ⅵ Ⅵ Faulty condenser
Ⅵ Ⅵ Faulty coil
Ⅵ Ⅵ Incorrect timing
Ⅵ Ⅵ Poor engine/transmission earth connections
Fault finding - Digiplex (electronic) ignition system
Engine fails to start
Ⅵ Ⅵ Excessive gap on TDC sensor
Ⅵ Ⅵ TDC or engine speed sensor short circuited or earthed
Ⅵ Ⅵ Defective ignition control unit
Ⅵ Ⅵ Control unit multi-plug contacts corroded
Ⅵ Ⅵ Defective coil
Engine lacks power, high fuel consumption
Ⅵ Ⅵ Incorrect ignition advance
Ⅵ Ⅵ TDC sensor incorrectly set
Ⅵ Ⅵ Distributor vacuum hose blocked