Geely CK (2008). Manual part — 18

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j. Poor intake and exhaust valve seal, failed piston ring, low compression pressure;

h. Too many carbon deposit in spark plug and combustion chamber;

k. Water temperature switch and thermostat fault;

l. Aging of Oxygon sensor;

m. Incorrect ignition timing;

n. Check valve fault.

Figure 149

Engine is difficult to start

Check whether the air cleaner is clogged

Clogged

Troubleshooting

OK

Check the idle control valve

NG

Repair or replace

OK

Check the fuel pressure

Excessivly low

Service the electric fuel pump,

fuel filter and fuel pressure regulator

OK

Check the vacuum pressure sensor

NG

Replace

OK

Check the water temperature sensor and intake air temperature sensor

NG

Replace

OK

Check the start switch signal

No

Service the start signal wire

OK

Check the ignition timing

Misaligned

Adjust

OK

Check the cylinder pressure

NG

Disassemble the engine

OK

Replace the ECU to retry

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(3) Diagnosis procedure for insufficient engine power (Figure 150)

2. Poor deceleration

(1) Symptom

Idling is normal, but the engine is frequently turned off upon sudden release of the accelerator pedal

during driving.

(2) Causes and Troubleshooting:

a. Throttle position sensor is damaged and shall be replaced;

b. Initial idling is not properly adjusted or automatic idle control is wrong, fuel cut RPM is too low,

ECU fault, repair or replace them.

Insufficient power

Insufficient

Check whether throttle valve can be fully open

Unable to be fully open

Adjust

OK

Check whether the air cleaner is clogged

Clogged

Clean or replace

OK

Check the throttle valve position sensor for failure

Abnormal

Repair or replace

OK

Check the water temperature switch and thermostat

NG

Replace

OK

Check the vacuum pressure sensor for failure

NG

Replace

OK

Check the fuel pressure

Excessively low or high

Service the electric fuel pump,

fuel

filter

and

fuel

pressure

regulator

OK

Check the oxygen sensor

Incorrect

Replace

OK

Check the injector

Incorrect

Replace

OK

Replace the spark plug, ignition coil and high voltage wire

OK

Disassemble the engine

Figure 150

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3. Poor acceleration

(1) Symptom

Engine speed can not be increased immediately after depressing the accelerator pedal, there is

time lag,and the acceleration reaction is delayed or there is slight fluctuation during the acceleration.

(2) Causes and Troubleshooting

a. There is fault in throttle position sensor, repair or replace it;

b. Poor intake system seal, repair it;

c. There is low fuel pressure, troubleshoot it;

d. Poor injector operation, clean or replace it;

e. Intake pressure temperature sensor fault, repair or replace it;

f. Check valve is damaged and shall be replaced;

g. Ignition advance angle is not correct and shall be adjusted;

h. Fuel pressure regulator is damaged and shall be replaced;

i. Air cleaner is clogged and shall be cleaned or replaced;

(3) Diagnosis procedure for poor acceleration (Figure 151)

Figure 151

Poor acceleration

Check the air tightness of the intake air system

Poor seal

Repair

OK

Check whether the air cleaner is clogged

Clogged

Clean or replace

OK

Check the throttle valve position sensor for failure

Abnormal

Repair or replace

OK

Check the fuel pressure

Abnormal

Service the electric fuel pump,

fuel filter and fuel pressure regulator

OK

Check whether the injector inject properly
at idle and maximum load

NG

Replace

OK

Check whether the check valve and EVAP are faulty

Yes

Repair or replace

OK

Check whether the vacuum pressure sensor is OK

NG

Replace

OK

Adjust a ECU to retry

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4. Big fuel consumption

(1) Symptom:

Engine power is ok, but the fuel consumption is big, exhaust pipe discharges black smoke.

(2) Causes and Troubleshooting:

a. When idling, idle speed is high and shall be adjusted;

b. Water temperature sensor fault, service or replace it;

c. Water temperature switch and thermostat fault, repair or replace it;

d. Oxygen sensor fault, repair or replace it;

e. Fuel pressure is big and shall be adjusted;

f. Injector fault (fuel leakage), repair or replace it;

g. Throttle position sensor fault, repair or replace it;

h. Fuel pressure regulator is damaged and shall be replaced;

i. Intake pressure temperature sensor fault, repair or replace it.

5. Unstable idle, liable to be turned off

(1) Symptom:

Engine starts normally, but the idle is unstable regardless of cold or hot status, idle speed is too low and

the engine is liable to be turned off.

(2) Causes and Troubleshooting

a. Poor idle control valve operation, repair or replace it;

b. Low idle speed and faulty or improperly adjusted idle control valve, troubleshoot it;

c. Water temperature sensor fault, repair or replace it;

d. Poor intake system seal, need to be repaired;

e. High voltage spark is too weak, spark plug carbon deposit or electrode clearance is too small, need

to be repaired, cleared and adjusted;

f. Pressure sensor fault, repair or replace it;

g. The compression pressure in the cylinder is too low, need to be serviced;

h. Fuel line pressure is too low, needed to be serviced;

i. Air cleaner is clogged, clean or replace it;

j. Poor injector atomization, fuel leakage, block or big injection variation, need to be repaired;

(3) Diagnosis procedure (Figure 152)

6. Unstable idle at cold status, liable to be turned off

(1) Symptom

During the cold start, idle is unstable and engine is liable to be turned off, the normal idle is recovered

after warming of the engine.

(2) Causes and Troubleshooting

a. Water temperature sensor fault, repair or replace it;

b. idle control valve fault, repair or replace it.