General engine diagnostics (Chevrolet Captiva 1 2006-2018: Engine 2.0 l (diesel): Troubleshooting)

STATE	Probable Cause	elimination
Difficult start (at cold start of the engine)	Fuel system malfunction
	Incorrect or contaminated fuel.	Clean fuel and fuel lines.
	Insufficient amount of fuel in the fuel tank.	Pour fuel into the fuel tank.
	Clogged or dirty fuel filter.	Replace fuel filter.
	Clogged fuel line.	Clean the fuel line.
	Fuel pump malfunction.	Replace fuel pump.
	High pressure pump failure.	Replace high pressure pump.
	Injector failure.	Replace nozzles.
	Water impurities or contamination in the fuel tank.	Clean the fuel tank.
	compression pressure drop
	Insufficient injector tightening.	Tighten to the specified tightening torque.
	Insufficient tightening of the glow plug.	Tighten to the specified tightening torque.
	Cracking of the cylinder head gasket.	Tighten to the specified tightening torque.
	Valve seat leak.	Replace cylinder head.
	Violation in the valve stem.	Replace valve.
	Insufficient elasticity or damage to the valve spring.	Replace valve spring.
	Significant malfunction of pistons and cylinders.	Replace piston rings.
	Severe wear of pistons, rings or cylinders.	Replace the cylinder block.
	Other
	Broken timing belt.	Replace timing belt.
	Crankcase ventilation valve malfunction (PCV).	Check and replace the PCV valve.
	Disconnection, damage or leakage of the vacuum hose.	Establish a secure hose connection or replace it
	Leak in the intake gasket.	Replace the intake gasket.
Lack of engine power	compression pressure drop	See page above.
	Fuel system malfunction
	Clogged fuel line.	Clean the fuel line.
	Clogged or dirty fuel filter	Change fuel filter
	Incorrect or contaminated fuel.	Clean fuel and fuel lines.
	Other
	Clogged or dirty air filter element.	Clean or replace the air filter element.
	Leak in the intake gasket.	Replace the intake gasket.
	Weak brakes.	Repair or replace the brakes.
	Clutch slip.	Adjust or replace clutch.
Unsteady idle.	compression pressure drop	See page above.
	Fuel system malfunction
	Clogged fuel line.	Clean the fuel line.
	Clogged or dirty fuel filter	Change fuel filter
	Incorrect or contaminated fuel.	Clean fuel and fuel lines.
	Fuel pump malfunction.	Replace fuel pump.
	High pressure pump failure.	Replace high pressure pump.
	Injector failure.	Replace nozzles.
	Other
	Clogged or dirty air filter element.	Clean or replace the air filter element.
	Crankcase ventilation valve malfunction (PCV).	Check and replace the PCV valve.
	Disconnection, damage or leakage of the vacuum hose.	Establish a secure hose connection or replace it
	Leak in the intake gasket.	Replace the intake gasket.
"slowness" engine (The engine does not react immediately when the gas pedal is pressed. This is especially noticeable when using cruise control or starting).	compression pressure drop	See page above.
	Fuel system malfunction
	Clogged fuel line.	Clean the fuel line.
	Clogged or dirty fuel filter	Change fuel filter
	Incorrect or contaminated fuel.	Clean fuel and fuel lines.
	Fuel pump malfunction.	Replace fuel pump.
	Injector failure.	Replace nozzles.
	Other
	Clogged or dirty air filter element.	Clean or replace the air filter element.
	Leak in the intake gasket.	Replace the intake gasket.
Rough running engine (engine power changes at a fixed speed and the speed changes without changing the pressure on the gas pedal).	compression pressure drop	See page above.
	Fuel system malfunction
	Clogged fuel line.	Clean the fuel line.
	Clogged or dirty fuel filter.	Replace fuel filter.
	Incorrect or contaminated fuel.	Clean fuel and fuel lines.
	Fuel pump malfunction.	Replace fuel pump.
	High pressure pump failure.	Replace high pressure pump.
	Injector failure.	Replace nozzles.
	Other
	Clogged or dirty air filter element.	Clean or replace the air filter element.
	Leak in the intake gasket.	Replace the intake gasket.
Increased detonation (within the throttle opening, a metallic pop with a disturbed flash is heard).	Engine overheating	Cm. "Overheat" in this section.
	Fuel system malfunction
	Clogged or dirty fuel filter.	Replace fuel filter.
	Leak in the intake gasket.	Replace the intake gasket.
	Large soot due to combustion failure.	Remove carbon.
Overheat	Cooling system failure
	Insufficient amount of coolant.	Add coolant.
	Thermostat failure.	Replace thermostat.
	Malfunction of the cooling fan.	Replace the cooling fan.
	Insufficient water pump supply.	Replace water pump.
	Radiator clogged or leaking.	Clean and repair or replace the radiator.
	Lubrication system failure
	Low quality engine oil	Change the engine oil to the specified grade.
	Clogged oil filter or coarse filter.	Clean or replace the oil filter or coarse filter.
	Not enough engine oil.	Add engine oil.
	Reduced oil pump performance.	Replace or repair the oil pump.
	Engine oil leak.	Repair the associated component.
	Other
	Weak brakes.	Repair or replace the brakes.
	Clutch slip.	Adjust or replace clutch.
	Leak in the intake gasket.	Replace the intake gasket.
Insufficient fuel consumption.	compression pressure drop	See page above.
	Fuel system malfunction
	Clogged fuel line.	Clean the fuel line.
	Clogged or dirty fuel filter	Change fuel filter
	Incorrect or contaminated fuel.	Clean fuel and fuel lines.
	High pressure pump failure.	Replace high pressure pump.
	Injector failure.	Replace nozzles.
	Cooling system failure
	Thermostat failure.	Replace thermostat.
	Other
	Incorrect installation of valves.	Repair or replace valves.
	Clutch slip.	Repair or replace the clutch.
	Low tire pressure.	Bring the tire pressure to normal.
Increased engine oil consumption	Engine oil leak
	Loose drain plug.	Tighten the drain plug.
	Loose oil pan bolt.	Tighten the oil pan bolt.
	Unsatisfactory condition of liquid gasket mastic.	Clean and apply liquid sealant.
	Loose oil filter cover.	Tighten the oil filter cap.
	Loose oil pressure sensor.	Tighten the oil pressure switch.
	Leakage in the front camshaft oil seal.	Replace front camshaft oil seal.
	Violation of tightness in the front crankshaft oil seal.	Replace front crankshaft oil seal.
	Violation of tightness in the rear crankshaft oil seal.	Replace crankshaft rear oil seal.
	Leakage in the cylinder head cover gasket.	Replace the cylinder head cover gasket.
	Violation of tightness in the cylinder head gasket.	Replace cylinder head gasket.
	Mixing with oil in the combustion chamber.
	The occurrence of the piston ring.	Remove carbon deposits and replace the ring.
	Piston or cylinder wear.	Replace piston or cylinder block.
	Worn piston ring or ring groove.	Replace piston or rings.
	The location of the cutting part of the piston ring is broken.	Adjust position.
	Abrasion or damage to the valve system.	Replace the valve system.
Low oil pressure	Lubrication system failure
	Incorrect oil viscosity.	Change the engine oil to the specified grade.
	Loosening the pressure switch in the oil line.	Pull up the switch.
	Not enough engine oil.	Add engine oil.
	Clogged coarse oil filter.	Clear filter.
	Insufficient oil pump supply.	Replace the oil pump.
Noise in the engine	Valve noise
	Abrasion of the valve stem or guide.	Replace valve or cylinder head.
	Weak valve spring.	Replace valve spring.
	Abrasion of the pusher pin and valve bridge.	Replace tappet or valve bridge.
	Noise from piston, ring, cylinder
	Abrasion of the piston, ring or cylinder.	Replace piston, ring or cylinder block.
	Noise from the crank
	Abrasion of the connecting rod bearing.	Replace connecting rod bearing.
	The connecting rod nut has loosened.	Tighten the connecting rod nut to the specified torque.
	Noise from crankshaft
	Abrasion of the main bearing.	Replace main bearing
	Abrasion of the crankshaft journal.	Replace the crankshaft journal.
	Loose bearing cap bolts.	Tighten the bearing cover bolts to the specified torque.
	Increased clearance in the crankshaft thrust bearing.	Adjust or replace.
	Oil pressure reduction	Cm. "Low oil pressure" in this section.