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