Geely CK (2008). Manual part — 19
Geely CK (2008). Manual part - 19
73
7. Unstable idle or engine shut off at hot status
(1) Symptom
Idle speed is normal during the cold start and becomes unstable at hot status, idle speed is too
low or engine is shut off.
(2) Causes and Troubleshooting
a. Idle is adjusted too low, adjust it to normal condition;
b. Water temperature sensor fault, repair or replace it;
c. Poor injector operation or big injection variation, repair or replace it;
d. Poor water temperature switch and thermostat operation, repair or replace it;
e. Check valve is damaged and needs to be replaced.
Figure 152
Rough ildling, easy for engine shut off
Check whethe the air tightness of the intake system is good
Poor
Troubleshooting
OK
Check idle control valve for operation
Inoperative
Disassemble or replace
Operative
Reset the initial idle speed
Check the spark plug
Poor
Adjust the clearance or replace
OK
Check the fuel pressure
NG Check the electric pump, fuel
pressure regulator and fuel filter
OK
Check the injector
NG
Replace
OK
Check the pressure sensor
NG
Replace
OK
Check the cylinder compression pressure
NG
Disassemble the engine
OK
Check and adjust the valve clearance
74
8. Idle speed too high at hot status
(1) Symptom
The engine runs at fast idle during cold start and remains fast idle at hot status, leading to excessively fast
idle.
(2) Causes and Troubleshooting
a. The initial idle value is not properly adjusted,
b. High system fuel pipeline pressure, need to be adjusted;
c. Water temperature sensor fault, repair or replace it;
d. Water temperature switch and thermostat fault, repair or replace it;
e. Idle control valve fault, repair or replace it;
f. Throttle is binding and not tightly closed, repair or replace it;
g. Fuel evaporation control valve is always open, repair or replace it;
h. Speed sensor fault, repair or replace it.
9. Idle fluctuation
(1) Symptom
when idling, the engine speed fluctuates.
(2) Causes and Troubleshooting
a. Intake pressure temperature sensor fault, repair or replace it;
b. Check valve is damaged and needs to be replaced;
c. Water temperature sensor , water temperature switch and thermostat is poorly coordinated, repair,
adjust and troubleshoot them;
d. Oxygen sensor fault, need to be replaced;
e. Spark plug poor connection, repair or replace it;
f. Idle control valve and its control circuit fault, repair or replace it;
g. Idle switch is not closed, need to be repaired.
75
10. Engine overheat (Table 6)
Table 6
Item
Symptom Troubleshooting
Repair or replace
Bad radiator hose
Replace
Bad radiator tube strap
Supplement welding, otherwise
replace it
Bad cylinder gasket
Replace
Cracky cylinder block
Remedy with infiltration technology
or replace it
Poor water pump seal
Replace the seal
Replace the anti-freeze liquid
Replace the thermostat
Broken weld
Supplement welding
Corrosion result in pin hole
Fill the pinhole with clear coat,
otherwise replace it
Repair and dredge
Improve the ventilation
Repair or replace the water pump
Troubleshooting, replace the motor if
it is damaged
Replace
Repair and dredge
Repair or replace the oil pan if there
is oil leakage, refill the oil if it is not
supplemented in time
Cause
Bad radiator cover
Clogged cooling tube
Poor ventilation
Water
leakage
Anti-freeze liquid not replaced
Bad thermostat
Radiator is
faulty
Water
leakage
Insufficient
coolant
Faulty fan voltage
Disabled radiator temperature control
switch
Water jacket is clogged because of too much scale
Insufficient engine oil (oil leakage or delayed filling)
Poor
cooling
Poor Fan
Faulty water pump
76
11. General engine fault symptom and faulty area (Table 7)
Table 7
Unable to explode initially
Una
ble
to e
xplode
c
omple
te
ly
Di
ffi
cul
t for col
d st
art
Di
ffi
cul
t for hot
st
art
No f
ast ilde
Low idle
spe
ed
High idle
spe
ed
Rough ildling
Id
le
hunting
At
urgent
accel
erat
io
n
When t
he accel
erat
or pedal
is
rel
easec
Dur
ing idling
P
oor accel
erat
io
n
Hunting during driving
Insuffi
ci
ent
power
Knock
Intake abosolute pressure
sensor
c c c c c c c
c c
Water temperature sensor
c c c c
c c
c
c c
c
Revolution speed sensor
c
Throttle valve position
sensor
c c c
c c c c c
Vehicle speed sensor
c
Fuel pump system
c c
c
c c
c
Fuel pressure regulator
c c c c c
c
c c c c
Fuel filter and pipeline
c c
c
c c c c
Injector
c c c c c
c
c c c
Starter signal
c c
Ignition coil
c
c
c
Spark plug
c c c c
c
c c
c
High pressure cable
c
c
Ignition timing
c c
c
c
c
c c
Igniter in the ECU
c
c c c
Throttle valve
c
c c c
c
Throttle valve body
c c
c
Air leakage in the intake
air system
c c
c c c c c
c
Air valve
c
c
c c c
ECU power supply circuit
c
Ignition swtich
c
Main relay
c
Fuel pump relay
c
Poor driving
Difficult to start Poor idling Engine off
Power
supply
system
Control
system
Fuel
system
Ignition
system
Intake
air
system
Suspect
Area
Symptom
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