Symptoms - Engine Mechanical. Chevrolet Spark 2007

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2007 🢒 Spark 🢒 HVAC 🢒 HVAC - Manual 🢒 Symptoms - Engine Mechanical

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.
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.
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.
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.
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.