Chery A11. Manual — part 29

CAC Gasoline Engine Maintenance And Servicing Manual

71

Carburetor engine faults ,causes and corrections

1.engine does not run during starting:

Cause

correction

(1). Battery wires are loose or corroded

reconnect or replace the

wires .

(2). Battery is discharged or damaged

recharge or replace the

battery .

(3). Starter circuits is opened or loosed or not energized

energize or replace the harness

(4). Starter solenoid valve or switch is damaged

replace starter solenoid valve or

switch

(5). Starter is damaged

replace starter

(6). Flywheel gear ring or starter pinion is loosed or damaged

replace flywheel gear ring or

starter

(7). No engine ground wire or ground wire is disconnected

connect or replace the ground

wire

2. engine runs but no spark exists during starting:

Cause

correction

(1). No fuel in fuel tank

fuel the tank

(2). No fuel in the carburetor float chamber

keep

trying

to

start

engine
(3). Battery is discharged(engine run slowly)

recharge or replace battery

(4). Battery wire connector is loosed or corroded

reconnects or replace battery

(5). Ignition parts is damp or damaged

replace ignition parts

(6). Ignition part harness is opened ,loosed or not energized. Reconnect or replace harness
(7). Spark plug is burned away, damaged or

Spark plug gap is not correct.

Replace spark plug

(8). Main mechanism is damaged(for example, camshaft)

check and service

(9). Fuel pump is damaged

replace pump

(10).Carburetor float chamber needle valve is binding or

oil strainer is blocked check, service and clean

(11).Idle cut-off valve does not open

check circuit and solenoid

3. difficult to start for engine when temperature is low:

Cause

correction

(1). Battery discharged

recharge battery

(2). Battery connector loosed or corroded

connect or replace the battery wires.

(3). Spark plug is corroded , damaged or the

Spark plug gap is not right. Replace spark plug

(4). Other ignition system problem

s

check and service

(5). Low cylinder compression pressure

sent to service spot for check and service

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CAC Gasoline Engine Maintenance And Servicing Manual

72

4. difficult to start for engine when temperature is high:
Cause

correction

(1). Air filter is dirty or blocked

clean air filter core or replace case

(2). low cylinder compression pressure

sent to service spot for check and

service
(3). Hydraulic valve lifting rod is damaged

replace the lifting rod

5. The starter noise or rough engagement.

Cause

correction
(1). Flywheel gear ring or starter’s pinion loose or broken

replace flywheel gear ring or starter

(2). Starter retaining bolt loose or missing

tighten retaining bolt or replace bolt

(3).the parts in Starter worn out or damaged

replace starter

6.Engine stalls right away after started.

Cause

Correction

(1). Ignition coil connection loose or damaged

connect ignition coil or replace ignition coil

(2). Vacuum leakage in intake manifold

replace sealing gasket or replace connecting

pipe

(3) carburetor float

position not proper

check carburetor float or needle valve

(4). mail measuring orifice blocked

check and clean mail measuring orifice

(5). Idle cut-off valve damaged and not open

check circuit and solenoid

(6). Idle speed too low

adjust engine idle speed

(7). idle speed

fuel outlet port or transition port blocked check and clean

7.Rough engine idle speed

Cause

Correction

(1). Air filter core blocked

clean or replace

(2). vacuum leakage in Intake manifold or relevant hose

check and service

(3). Spark plug corroded, damaged or

Spark plug gap not correct replace spark plug

(4). Hydraulic valve lifting rod damaged

replace the lifting rod

(5). Idle speed fuel outlet port or transition port

blocked check and clean

(6). fast idling adjustment not correct check fast idling spring for

fallout ,readjustment.

(7). Low or unstable Cylinder compression pressure

check and service

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CAC Gasoline Engine Maintenance And Servicing Manual

73

(8). Timing belt tightening incorrectly

adjust timing belt tension

(9). Idle mixture too rich or lean

adjust carburetor idle mixture adjustment screw

8. engine Stalls during idling:

Cause

Correction

(1). Low idle speed

adjust idle speed

(2).fuel outlet port or transition port for Idle speed
blocked check and clean
(3). Choke not open or out of work

check choke system

(4). carburetor float

position not proper

check carburetor float or needle valve

(5). Spark plug corroded , damaged or

Spark plug gap not right.l replace spark plug

(6). High tension wire damaged

replace high tension wire

(7). Ignition timing not correct

adjust ignition timing

(8). Hydraulic valve lifter damaged

replace Hydraulic valve lifting rod

(9). low or unstable cylinder compression pressure

check and service

(10). PCV hose loose, leaking, or damaged

connect or replace

9. engine Stalls within operation speed range

Cause

Correction

(1). Fuel filter blocked

replace fuel filter

(2). Fuel pump working incorrectly or low

output pressure replace fuel pump

(3). Tank ventilation hole clogged or fuel hose

clogged dredge the hose

(4). Carburetor float needle valve binding

service or replace

(5). Intake manifold or connecting hose

vacuum leakage check, service or replace

(6). Spark plug corroded , damaged or

Spark plug gap abnormal replace spark plug

(7). High pressure wire damaged

replace

(8). Ignition coil damaged

replace

(9). Low or abnormal cylinder compression pressure measure pressure and service

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CAC Gasoline Engine Maintenance And Servicing Manual

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10. Engine accelerates hesitately

Cause

Correction

(1). Intake manifold or connecting hose

vacuum leaking service and check

(2). Fuel filter clogged

replace fuel filter

(3). Fuel pump damaged. Or low fuel outlet pressure

replace fuel pump

(4). Carburetor acceleration pump clogged or

clean or replace accelerator pump

diaphragm diaphragm damaged

(5). Part-load fuel way clogged

clean and service

(6). Spark plug corroded, damaged or

Spark plug gap abnormal replace spark plug

11.Engine speed is not as specified

Cause

Correction

(1). Intake manifold or connecting hose vacuum leaking

service and check

(2). Fuel filter blocked

replace fuel filter

(3). Fuel pump damaged. Or low fuel outlet pressure

replace fuel pump

(4). Fuel Tank ventilation pipe blocked or fuel hose

blocked dredge the hose

(5). Throttle valve not widely open

adjust

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

adjust or service

12. Engine power is not enough.

Cause

Correction

(1). Incorrect Ignition timing

check or adjust distributor

(2). Incorrect Timing belt assembly or

adjust ‘teeth’ belt tension or tension

incorrect belt tension

pulley.

(3). Carburetor float chamber level too low or

check and clean carburetor float needle

fuel intake strainer blocked

valve and strainer

(4). Throttle valve not widely open

adjust

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

adjust or service

(6). Fuel filter blocked

replace

(7). Abnormal or too low cylinder compression pressure check and service
(8). Spark plug corroded , damaged or

Spark plug gap abnormal replace spark plug

(9). Intake manifold or connecting hose vacuum leaking

check or service

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