Geely FC. Manual part — 7
Geely FC. Manual part - 7
Exhaust gas control - Exhaust gas control system
3. PCV valve assembly [4G18-1014110]
(a) Blow air into valve from cylinder side and check the air is
easy to get through.
Warning: do not suck against the valve, because the
gasoline left in the valve will make you be
injured.
(b) Blow air into valve from intake manifold side and check
the air is hard to get through.
Hint: if the function does not conform to the standard, PCV
valve should be replaced.
Inspection
1. Carbon canister assembly [4G18-1129020]
Carbonl canister assembly. Check the function of carbon can-
ister according to the following tables.
Standard:
2. Carbon canister control valve
(a) For carbon canister control valve, check the conduction be-
tween terminals.
Resistance:
(b) Check the control valve operates.
(1) Supply battery voltage to its terminal.
(2) Check air is flown as the arrow direction on valve body.
25
Inspection Methods
Standard
Close B hole and C hole and then
supply vacuum to A hole
No leakage
Close C hole and then supply vacuum Air flown out
to A hole
from B hole
Close C hole and then blow air Air flown out
into A hole
from B hole
Blow air into A hole
Air flown out from B hole
and C hole
Clean hose
Cylinder side
Intake manifold side
Engine mechanism
Engine assembly
Inspection
1. Check coolant.
2. Check engine oil.
3. Check battery.
4. Check air filter assembly.
5. Check spark plug [4G18-3705113].
6. Check drive belt [4G18-1307107].
Hint: do not check belt tension, because automatic tensioner is applied.
7. Check ignition timing.
(a) Warm up engine.
(b) Connect timing lamp to engine.
(c) Check ignition timing at idle speed.
Ignition timing: before top dead center
Note: when checking ignition timing, place
transmission at neutral position.
Hint: After run the engine for 5 seconds with rotating
speed of 1000-1300rpm, check the engine could
recover to idle running.
8. Check engine idle speed.
(a) Warm up engine and run it at idle speed.
(b) Read engine rotating number in data flow with diagnostic instrument.
(c) Check idle speed.
Idle speed: about 750-850rpm
Notes:
When checking idle speed, place cooling fan at OFF position.
Turn off all auxiliary devices and air conditioner.
Engine mechanism - Engine assembly
K-line
26
9. Check compression pressure.
(a) Warm up engine.
(b) Remove ignition coil.
(c) Remove spark plug.
(d) Check cylinder compression pressure.
(1) Install cylinder compression pressure gauge on spark plug hole.
(2) Wide open throttle.
(3) Measure the pressure during crankshaft rotating.
Notes:
Ensure to use fully charged battery to make the rotating speed of engine reach or exceed 250rpm.
When measuring other items, please repeat steps (1) to (3).
Finish the measurement as soon as possible.
Compression pressure:
1080kPa
Min pressure:
1000kPa
Difference among cylinders:
100kPa
(4) If the compression pressure of one or more cylinders is too low, inject a small amount of engine oil
from spark plug hole into the cylinder with low pressure, and repeat steps (1) to (3) to check
pressure.
If the pressure increases after engine oil is injected, the piston ring of this cylinder or the
cylinder has been worn or scratched.
If the pressure is still too low, the valve may be stuck or not fully closed, or the cylinder head
gasket leaks.
10. Check CO/HC.
(a) Start engine.
(b) Keep the rotating speed of engine at 2500rpm for about 180 seconds.
(c) When the engine is idle running, insert the test bar of CO/HC gauge into exhaust pipe at least 40cm.
(d) Immediately check idle speed and CO/HC concentration at 2500rpm.
Hints:
Finish test within 3 minutes.
Perform the test under 2 analog states (idle speed and 2500rpm) according to measuring meth-
ods and sequences specified by Emission Regulations.
(e) If CO/HC concentration is not within specified value, perform trouble shooting according to the
following sequences.
(1) Check the function of oxygen sensor.
(2) See possible failure causes listed in the table below, and repair and correct if necessary.
Engine mechanism - Engine assembly
27
Engine mechanism - Engine assembly
CO
HC
Trouble occurrence
Possible causes
28
Normal
High
Unstable idle speed
Low
High
Unstable idle speed
(HC readings not stable)
High
High
Unstable idle speed
(black smoke emission)
1. Ignition system malfunction
Ignition timing incorrect
Spark plug too dirty, short circuit or clearance
incorrect
2. Valve clearance incorrect
3. Air inlet and exhaust valve leaky
4. Cylinder leaky
1. Vacuum leak:
PCV hose
Intake manifold
Throttle body
Idle speed stepping motor
Vacuum booster and pipelines
2. Fire caused by too thin mixing ratio
1. Air filter core blocked
2. PCV valve blocked
3. EFI system malfunction
Fuel pressure regulator malfunction
Water temperature sensor malfunction
Intake pressure sensor malfunction
ECU malfunction
Injection nozzle malfunction
Throttle position sensor malfunction
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