
Fault diagnosis
Symptom/fault
Remedy
Engine fails to start
1. No fuel to carburettor:
- blocked fuel pipes or fuel filter;
- clogged carburettor or fuel pump filters;
- faulty fuel pump
2. Ignition system fault
3. Carburettor fuel cutoff solenoid fails to open at ignition switch-on:
- disconnected, loose or broken wiring to solenoid or solenoid control
unit;
- faulty solenoid control unit;
- defective fuel cutoff solenoid
4. Carburettor choke not opening at first flashes in cylinders
Engine idles erratically or stalls
1. Incorrectly adjusted idle speed
2. Defective carburettor solenoid control system
3. Faulty carburettor:
- blocked carburettor jets or internal passages;
- water in carburettor;
- broken choke control diaphragm
4. Ignition system fault
5. Vacuum leak through damaged hose between intake pipe and brake
servo unit
6. Air leak through gaskets at connections between intake pipe and car-
burettor/cylinder head
7. Leaking distributor vacuum pipe
Engine lacks power and has poor acceleration
1. Partly open throttle
2. Choked air cleaner element
3. Ignition system fault
4. Faulty fuel pump
5. Faulty carburettor:
- faulty accelerator pump;
- blocked main jets;
- partly open choke;
- low fuel level in float chamber;
- leaky throttle enrichment diaphragm
6. Restricted fuel tank vent pipe
7. Incorrect valve clearances
8. Misaligned timing marks
9. Insufficient cylinder compression - below 1 åP‡ (10 kgf/Òm
2
):
- broken or sticking piston rings;
- poor valve-to-seat fitting;
- excessively worn cylinders or piston rings
9
1. Carry out the following operations:
- blow fuel pipes, clean fuel tank, renew fuel filter;
- clean filters;
- check pump operation and renew any damaged components
2. Refer to section «Ignition system»
3. Carry out the following:
- check wiring and connections, renew damaged wires;
- renew control unit;
- replace solenoid with a new one
4. Eliminate any leakage of choke pull-down unit
1. Adjust idle speed
2. Refer to «Engine fails to start»
3. Carry out the following:
- blow carburettor jets and internal passages;
- remove water from carburettor, drain sludge from fuel tank;
- fit new diagram
4. Refer to section «Ignition system»
5. Replace damaged hose
6. Tighten retaining nuts or renew gaskets; eliminate carburettor flange
deformation or fit new carburettor
7. Fit new pipe in place of damaged one
1. Adjust throttle linkage
2. Change filter element
3. Refer to section «Ignition system»
4. Check pump operation and renew any damaged components
5. Carry out the following:
- check pump operation, renew damaged parts;
- blow jets with compressed air;
- adjust choke operation;
- adjust float;
- replace diaphragm
6. Blow pipe with compressed air
7. Adjust valve clearances
8. Adjust timing belt accordingly, align timing marks
9. Carry out the following:
- clean piston rings or grooves from carbon deposits, renew damaged com-
ponents;
- replace damaged valves, regrind valve seats;
- replace pistons, rebore and hone cylinders.
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