Geely Diagnosis Flow. Manual part — 22

85

No. 048 Exhaust pipe bombs

Malfunction Causes

Solution

①

Improper ignition timing

①

Check ignition timing. When the engine is at idling speed,

ignition advance angle is 10°--12°; if not correct, adjust
advance angle of initial ignition of the engine. When
accelerating, ignition advance angle could automatically be
increased to 20°--30°. If unusual, check ignition control system
or replace ECU;

②

Oil injector leaking, causing gas mixture

too thick

②

Check oil injector is leaking; if so, replace it;

③

Engine valve timing error

③

Check valve timing is correct; if not, adjust it;

Exhaust pipe
bombs

④

Oil injection control program malfunction

within ECU

④

Replace engine’s Electronically Controlled Unit (ECU);

Repair

Exhaust pipe bombs

Improper ignition timing

Oil injector leaking

Engine valve timing error

Clean

Repair

Oil ejection control program malfunction

Replace

Normal

Unusual

Normal

Normal

Improper

Leaking

Error

86

No. 049 Engine knocking

Malfunction Causes

Solution

Fuel with low grade and poor quality

Check fuel quality and confirm fuel grade; if not reaching
specified requirements, replace it;

Ignition time too early

Check ignition timing. When the engine is at idling speed,
ignition advance angle is 10°--12°; if not correct, adjust
advance angle of initial ignition of the engine. When
accelerating, ignition advance angle could automatically be
increased to 20°--30°. If unusual, check ignition control system
or replace ECU;

Cooling system malfunction

Engine overheating may cause this problem; check cooling
system;

Put screwdriver at filler port, and put your ear against the
screwdriver lever, and carefully observe and listen;

Flame out for cylinders gradually; if sound of this cylinder
weakens or disappears, then it is confirmed that this cylinder
has abnormal sound;

To differentiate from other abnormal sound, fill in some
lubricating oil at spark plug hole of this cylinder; if the sound
weakens or disappears, then it is confirmed as piston knocking
sound;

When knocking sound is very severe and filler port is smoking
externally, it is because that clearance between piston and
cylinder wall is too large;

Piston and cylinder wall severely worn,
with too large clearance

After confirming knocking sound, check cylinder diameter and
piston dimension; repair according to technical requirements or
replace it;

Intake manifold leaking

Causing too many intake amounts, and thin gas mixture
causes engine knocking; check pipes; if abnormal, repair or
replace;

Oil pressure too low

Oil pressure too low, causing too few ejecting amounts, and
thin gas mixture causes engine knocking; check fuel pump and
pipe; if necessary, replace it;

Oil injector blocked

Oil injector blocked, causing too few ejecting amounts, and thin
gas mixture causes engine knocking; check and clean the oil
injector; if necessary, replace it;

Carbon deposit within the cylinder too
many

Check carbon deposit within the cylinder; if too many causing
glowing ignition and knocking, clean it;

Compression rate too large

Check cylinder cover is grinding; if grinding too large causing
combustion chamber smaller, and compression ratio too large
causing piston knocking, replace cylinder cover;

Individual cylinders not working

Eliminate it one by one

Intake manifold pressure temperature
sensor invalid

Causing too many intake amounts, and thin gas mixture
causing engine knocking; check electrical signal of sensor; if
abnormal, replace it;

Metal knocking sound
occurs when the
engine increases the
load or grades up

Program malfunction within ECU

Replace ECU assembly;

87

Repair

Carbon deposit within the
cylinder too many

Compression rate too large

Individual cylinders not
working

Intake manifold pressure temperature sensor
invalid

Oil ejector blocked

Oil pressure too low

Piston and cylinder wall severely worn, with too large clearance

Ignition time too early

Fuel with low grade and poor quality

Engine knocking

Replace

Clean

Repair

Repair

Repair

Repair

Repair

Replace

Intake manifold leaking

Cooling system
malfunction

Repair

Repair

Program malfunction within
ECU

Replace

Normal

Poor quality

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Worn

Too early

Too low

blocked

Too much

Too large

Not working

Abnormal

Leaking

Abnormal

Abnormal

88

No. 050 Engine burning oil

Malfunction Causes

Solution

PCV valve invalid

Check one-way throughout of PCV valve at upper of valve chamber
hood; if not, it will cause exhaust gas pressure too high within the
engine, thus burning engine oil; otherwise replace it;

Engine oil too much

Reduce oil amounts;

Engine oil with poor quality

Replace engine oil;

Check valve oil seal is aged, without sealing, engine oil enters to
combustion chamber through valve stem. Replace valve oil seal;

Valve oil seal malfunction

Check clearance between valve stem and valve guide; if too large
caused by abrasion, replace it;

Valve oil seal malfunction

Check piston ring is broken and elasticity and end clearance, side
clearance, back clearance conform to requirements; if not, replace;

Oil consumption
too much, tail gas
in blue

Piston and cylinder severely worn

Check clearance between piston and cylinder bushing conforms to
requirements; if not, repair the engine;

Replace

Repair

Engine burning oil

PCV valve invalid

Valve oil seal malfunction

Engine oil too much

Engine oil with
poor quality

Piston ring, piston and
cylinder malfunction

Repair

Replace

Discharge

Normal

Abnormal

Normal

Normal

Normal

Invalid

Abnormal

Too much

Poor