Chery A11. Manual — part 30

CAC Gasoline Engine Maintenance And Servicing Manual

75

13. Carburetor backfire.

Cause

Correction

(1). Engine ignited too late

check

or

adjust

distributor
(2). Incorrect Timing belt assembling or

adjust ‘teeth’ belt tension and

inadequate belt tension

tension pulley

(3). Carburetor fuel level too low or

check and adjust float chamber

mixture too lean

needle valve

(4). Carburetor measuring orifice blocked or

clean

float chamber watery

(5). Spark plug overheated or too much carbon deposits

adjust and service

(6). Intake valve sealing not well

check and service

(7). Intake manifold or connecting hose vacuum leakage

check and service

14. Oil pressure warning light is illuminated during engine running.

Cause

Correction

(1). Engine oil level too low or not correct fill in engine oil or apply correct engine oil
(2). Oil pressure warning light woks abnormally

replace Oil pressure warning light

(3). Engine temperature too high

see No. 17.

(4). Engine bearing or fuel pump worn out

check, service or replace

(5). Fuel pump relief valve binding or spring deformed

check or replace

(6). Oil collector blocked or loose

clean or replace or tighten

15. Engine self ignited.

Cause

Correction

(1). Too high idle speed, too lean mixture or

adjust idle speed or fast idle

boost

fast idle gear out of work

(2). Incorrect fuel grade

use fuel of correct grade

(3). Too much carbon deposits in Spark plug or

combustion chamber

clean carbon deposits

(4). Idle cut-off valve not works or circuit trouble

service or replace

(5). Choke and throttle valve out of work

check relevant connecting mechanism

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CAC Gasoline Engine Maintenance And Servicing Manual

76

16. Engine noise.
(1). Preigniton or knocking occursduring accelerating or under heavy load

Cause

Correction

a. Incorrect ignition timing check ‘teeth’ belt tension, tension
pulley or distributor
b. Incorrect fuel grade

use

fuel

of

correct

grade
c. Intake manifold or connecting hose vacuum leakage

check and service

d. Too much carbon deposits in Spark plug or combustion

chamber carbon severely clean carbon deposits

(2). whistle noise:

Cause

Correction

a. Intake manifold sealing gasket leaks

replace sealing gasket or tighten

bolts
b. Exhaust manifold sealing gasket leaks or

replace sealing gasket or tighten

bolts
exhaust pipe sealing gasket leaks
c. Vacuum hose leaks

replace

d. Cylinder head gasket burned badly

check and replace

(3). Knocking or spanking noise

Cause

Correction

a. Hydraulic valve lifter works abnormally

check and replace

b. Valve mechanism or camshaft worn

out

check and service

c. Timing belt or tension pulley worn out

replace

d. Abnormal accessories ie. alternator or water pump

check, service and replace

(4). Knocking or hammering noise.

Cause

Correction

a. Connecting rod bushing worn out(generally severe knocking,

check and service

May be relieved under load.)

b. Main bearing half shell worn out(booming or

check and service

knocking noise, may be relieved under load.)

c.

Piston knocking (apparent with engine cold)

check and service

d.

Alternator or water pump accessories damaged

check and service

17. Engine is overheated.

Cause

Correction

(1). No sufficient coolant in the cooling system

add coolant

(2). thermostat damaged

replace

(3). Radiator core blocked or air inlet cogged

clean or replace radiator

(4). Radiator electrical fan or coolant temperature

check, service and replace

sensor abnormal

(5). Expansion tank pressure cap damaged

replace

(6). Water pump leaks or damaged

service or replace

(7). ignition timing too late

adjust ignition timing

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CAC Gasoline Engine Maintenance And Servicing Manual

77

(8). Air exists in cooling system

bleeding the air

(9). Too lean mixture

adjust carburetor

18. Engine is too cold

Cause

Correction

(1). themostat damaged

replace thermostat

(2). Water temperature sensor damaged

replace water temperature sensor

19. Too much fuel consumption

Cause

Correction

(1). Air filter blocked

replace air filter core

(2). Too high idle speed

adjust idle speed

(3). Choke not widely open or auto-choke damaged

djust or service

(4). Load enrichment diaphragm damaged or

check and replace

vacuum pipe blocked

(5). Carburetor acceleration pump ball valve

check accelerator pump ball valve

continuously leaks

mechanism parts

(6). Fuel pipe leaks

correct fuel pipe

connector leakage
(7). cylinder compression pressure decreases

check engine

(8). Incorrect ignition timing

adjust ignition timing

(9). Too low tire pressure

inflate the tire

CAC480M Engine’s single port injection system

One. summarize

The system, referred as “λSpeed Density” type(running speed, air density, mixture control), is designed

to perform the control for injection and distributorless ignition.
According to the following figure(figure 134) of Single Port Injection System, three basic parts are included as
the following:

1.

“I.A.W.6F。” Injection System ECU.

2.

“20MM12” Single Port Injection System throttle valve body.

3.

two “BAE 800 AK” Ignition coil.

The whole system includes fuel pump, fuel filter, RPM sensor, absolute pressure sensor, λsensor and so on.

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CAC Gasoline Engine Maintenance And Servicing Manual

78

1. fuel tank

2. fuel pump

3. fuel

filter
4. check valve

5. fuel pressure regulator

6. fuel

injector
7. air filter

8. fuel vapor connecting pipe

9.engine

idle

speed

actuator

10. absolute pressure sensor 11. injection/ignition system ECU

12. throttle valve position sensor 13. water sensor

14. intake temperature

sensor

15. injection/ignition system dual relay 16. ignition coil

17. tacho / TDC sensor

18. spark plug 19. CHECK-UP1

diagnostic port

20. fuel vapor recirculation solenoid 21. λsensor
22. tachometer

23. IAW system warning indicator

Two. Operation principle:

Single Port Injection System is applied on the vehicle equipped with 3 way catalyst converter .the

system insures air/fuel mixture ratio in the vicinity of the ideal air/fuel ratio.

The ideal air/fuel ratio is important for catalyst converter to work normally. The aim having the catalyst

converter installed is to reduce harmful exhaust emission. Theλsensor, analyzing oxygen content in exhaust
gas continuously , may ensure getting ideal mixture . If air/fuel ration is not ideal, ECU may adjust the mixture
consistence continuously by measuring fuel intake in progression.

Fuel system(fuel pump, fuel filter, pressure regulator) offers the fuel of 1 bar to fuel injector.
The fuel Injection value is proportional to the air sucked into the engine . also the fuel is injected into

intake manifold synchronously with TDC . under some specified condition , the amount of fuel needed for
engine circulation is too small to measure, the system may perform a asynchronous injection ( inject once
instead of the normal injection ever several TDCs ).

Ignition controller with inductive discharging is of electrostatic discharge type(distributorless). Ignition

Fig. 134 single port injection system

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