Fiat 999 CC Automobile User Manual


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