Symptoms - Engine Mechanical. Chevrolet Joy 2008

For 1990-2009 cars

Table 1: | Hard Start
Table 2: | Lack of Power, Sluggishness, or Sponginess
Table 3: | Rough, Unstable, or Incorrect Idle and Stalling
Table 4: | Hesitation, Sag, Stumble
Table 5: | Surges/Chuggles
Table 6: | Detonation/Spark Knock
Table 7: | Engine Overheating
Table 8: | Poor Fuel Economy

#### Hard Start

Checks | Actions
--- | ---
Malfunction of Ignition System

- Faulty fuse

Replace the fuse.

- Faulty spark plug

Clean and adjust the plug gap or replace.

- Electric leakage at the high tension cable

Replace the cable.

- Poor connection of the high tension cable or lead wires

Replace the cable or wires.

- Worn distributor cap or accumulated carbon in the distributor cap

Replace or clean the distributor cap.

- Damaged distributor rotor or cap

Replace the rotor or the cap.

- Improper ignition timing

Adjust the ignition timing.

- Faulty ignition coil

Replace the ignition coil.

Malfunction of Fuel System

- Lock of fuel in the fuel tank

Feed the fuel.

- Dirty or clogged fuel filter

Replace the filter.

- Clogged fuel pipe

Clean the fuel pipe.

- Malfunction of the fuel pump

Replace the fuel pump.

- Malfunction of the fuel injector

Replace the injector.

- The foreign material in the fuel tank

Clean the fuel tank.

Decline of Compression Pressure

- Poor tightening spark plug

Tighten to the specified torque. Refer to Fastener Tightening Specifications.

- Cracked cylinder head gasket

Replace the gasket.

- Inadequate valve clearance

Adjust the clearance.

- Leakage of the valve clearance

Repair the valve.

- Interference of the valve stem

Replace the valve or the valve guide.

- Low elasticity or damage of the valve spring

Replace the valve spring.

- Abnormal interference of pistons and cylinders

Replace the piston ring.

- Excessive wear of pistons, rings, or cylinders

Replace the ring or the piston and boring, or replace the cylinder.

Others

- Broken timing belt

Replace the belt.

- Malfunction of positive crankcase ventilation (PCV) valve

Check and replace the PCV valve if needed.

- Loosening, damage, or leakage of the vacuum hose

Connect the hose correctly or replace it.

- Leakage of the intake system

Replace the intake system.

#### Lack of Power, Sluggishness, or Sponginess

Checks | Actions
--- | ---
Decline of Compression Pressure | Refer to Symptoms - Engine Controls.
Malfunction of Ignition System

- Improper ignition timing

Adjust the ignition timing.

- Faulty spark plug

Adjust or replace the spark plug.

- Malfunction of the distributor

Repair or replace the distributor. Check the rotor.

- Electric leakage or poor connection of the high tension cable

Connect the cable correctly or replace it.

Malfunction of Fuel System

- Clogged fuel pipe

Clean the pipe.

- Clogged or contaminated fuel filter

Replace the filter.

Others

- Clogged exhaust system

Check and repair the system.

- Clogged or contaminated air cleaner element

Clean or replace the air cleaner element.

- Leak of the intake manifold gasket

Replace the gasket.

- Dragging brakes

Repair or replace the brakes.

- Slipping clutch

Adjust or replace the clutch.

#### Rough, Unstable, or Incorrect Idle and Stalling

Checks | Actions
--- | ---
Decline of Compression Pressure | Refer to Symptoms - Engine Controls.
Malfunction of Fuel System

- Clogged fuel pipe

Clean the pipe.

- Clogged or contaminated fuel filter

Replace the filter.

- Malfunction of the fuel pressure regulator

Replace the regulator.

Malfunction of Ignition System

- Malfunction of the spark plug

Adjust or replace the spark plug.

- Electric leakage or poor connection of the high tension cable

Connect the cable correctly or replace it.

- Worn distributor cap terminal or accumulated carbon in the distributor cap

Replace or clean the distributor cap.

- Loosening or damage of the distributor rotor or cap

Replace the rotor or cap.

- Poor ignition timing

Adjust the ignition timing.

- Malfunction of the ignition coil

Replace the ignition coil.

Others

- Clogged or contaminated air cleaner element

Clean or replace the air cleaner element.

- Leak of the intake manifold gasket

Replace the gasket.

- Malfunction of positive crankcase ventilation (PCV) valve

Check the valve or replace it if needed.

- Poor connection or damage or leakage of the vacuum hose

Connect the hose correctly or replace it.

#### Hesitation, Sag, Stumble

Checks | Actions
--- | ---
Decline of Compression Pressure | Refer to Symptoms - Engine Controls .
Malfunction of Ignition System

- Poor ignition timing

Adjust the ignition timing.

- Poor spark plug or poor adjustment of the plug gap

Replace the plug or adjust the gap.

- Electric leakage or poor connection of the high tension cable

Connect the cable correctly or replace it.

Others

- Malfunction of the air cleaner system

Clean or replace the air cleaner system.

- Leak of the intake manifold gasket

Replace the gasket.

#### Surges/Chuggles

Checks | Actions
--- | ---
Decline of Compression Pressure | Refer to Symptoms - Engine Controls .
Malfunction of Fuel System

- Clogged fuel pipe

Clean the pipe.

- Clogged or contaminated fuel filter

Replace the filter.

- Malfunction of the fuel pressure regulator

Replace the fuel pressure regulator.

Malfunction of Ignition System

- Malfunction of the spark plug

Adjust or replace the spark plug.

- Electric leakage or poor connection of the high tension cable

Connect the cable correctly or replace it.

- Worn distributor cap terminal or accumulated carbon in the distributor cap

Clean or replace the distributor cap.

- Loosening or damage of the distributor rotor or the cap

Replace the distributor rotor or the cap.

- Poor ignition timing

Adjust the ignition timing.

Others

- Leak of the intake manifold gasket

Clean or replace the gasket.

- Leakage of the vacuum hose

Connect the hose correctly or replace it.

#### Detonation/Spark Knock

Checks | Actions
--- | ---
Overheated Engine | Refer to Engine Overheating .
Malfunction of Ignition System

- Abnormal spark plug

Replace the spark plug.

- Poor ignition timing

Adjust the ignition timing.

- Electric leakage or poor connection of the high tension cable

Connect the cable correctly or replace it.

Malfunction of Fuel System

- Clogged or contaminated fuel filter and fuel pipe

Clean or replace the fuel filter and the fuel pipe.

Others

- Leak of the intake manifold gasket

Replace the gasket.

- Excessive carbon deposit due to abnormal combustion

Remove the carbon.

#### Engine Overheating

Checks | Actions
--- | ---
Malfunction of Cooling System

- Lack of coolant

Refill the coolant.

- Malfunction of the thermostat

Replace the thermostat.

- Malfunction of the cooling fan

Check or replace the cooling fan.

- Poor water pump performance

Replace the pump.

- Clogged or leaky radiator

Clean, repair, or replace the radiator.

Malfunction of Lubrication System

- Poor engine oil

Replace the engine oil with the specified one.

- Blocking oil filter or strainer

Clean or replace the oil filter or the strainer.

- Lack of engine oil

Refill the oil.

- Poor oil pump performance

Replace or repair the pump.

- Leakage of oil

Repair the leak.

Other

- Damaged cylinder head gasket

Replace the gasket.

#### Poor Fuel Economy

Checks | Actions
--- | ---
Decline of Compression Pressure | Refer to Symptoms - Engine Controls.
Malfunction of Fuel System

- Leakage of the fuel tank or the fuel pipe

Repair or replace the fuel tank or the fuel pipe.

Malfunction of Ignition System

- Improper ignition timing

Adjust the ignition timing.

- Abnormal spark plug - Excessive carbon deposit, inadequate gap, burnt electrode

Replace the plug.

- Electric leakage or poor connection of the high tension cable

Connect the cable normally or replace it.

Malfunction of Cooling System

- Malfunction of the thermostat

Replace the thermostat.

Others

- Improperly installed valve

Repair or replace the valve.

- Slipping clutch

Repair or replace the clutch.

- Low pressure of tires

Adjust the pressure of the tires.