HYOSUNG Aquila GT250 Ej Service Manual page 102

Complaint
Engine idles poorly. 1. Tappet clearance out of adjustment.
2. Poor seating of valves.
3. Defective valve guides.
4. Worn down camshafts.
5. Too wide spark plug gaps.
6. Defective ignition coils.
7. Defective pick-up coil.
8. Defective ECU.
9. Defective fuel pump.
10. Imbalanced throttle valve.
11. Damaged or cracked vacuum hose.
12. Defective TP sensor.
Engine stalls often. Incorrect fuel / air mixture
1. Defective IAP sensor or circuit.
2. Clogged fuel filter.
3. Defective fuel pump.
4. Defective fuel pressure regulator.
5. Defective ET sensor.
6. Defective IAT sensor.
7. Damaged or cracked vacuum hose.
Fuel injector improperly operating
1. Defective fuel injectors.
2. No injection signal from ECU.
3. Open or short circuited wiring connection.
4. Defective battery or low battery voltage.
Control circuit or sensor improperly operating
1. Defective ECU.
2. Defective fuel pressure regulator.
3. Defective IAT sensor.
4. Defective pick-up coil.
5. Defective ET sensor.
6. Defective fuel pump relay.
7. Defective TP sensor.
Engine internal parts improperly operating
1. Fouled spark plugs.
2. Defective pick-up coil or ECU.
3. Clogged fuel hose.
4. Tappet clearance out of adjustment.
Symptom and possible causes
101
SERVICING INFORMATION 7-2-1
Remedy
Adjust.
Replace or repair.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Repair or replace.
Replace or recharge.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Clean.
Adjust.