During the operation of the engine, some malfunctions may occur:
- - engine does not start;
- - the engine is unstable;
- - high or low idle speed of the crankshaft;
- - increased toxicity of exhaust gases.
Let's consider the causes and methods of correcting these defects and some others.
Engine won't start
Fuel supply interrupted - Check fuel pump fuse
Fuel pump does not work - Check the condition of the contacts in the connections of the pump, pump relay and start relay
Valve valve timing - Restore the phases at the service station
The pressure reducing valve of the fuel system is out of order - Replace the valve
Clogged fuel filter - Change filter
Faulty ignition system:
The contact in the circuits of the ignition coils and the control unit is broken - Restore the contact
Ignition coil failed - Replace coil
Engine running erratically
Water in the fuel tank - Drain sediment from the tank
Air leakage through leaks in the intake system, crankcase ventilation or idle speed control - Repair leaks in the connections
Interruptions or failure of one of the cylinders:
- - carbon deposits on a candle or failure of a candle - Clean carbon deposits or replace a candle
- - contact of the injector is broken or the injector is out of order - Restore contact or replace the injector
- - spark plug tip broken - Replace tip
- - control block is faulty - Replace block
Interruptions or failure of two cylinders:
- - faulty ignition coil - Replace coil
- - control block is faulty - Replace block
High idle speed, warm engine
Leaks in the crankcase ventilation and idle air control hose connections - Repair leaks in the connections
The contact of the idle speed regulator is broken or the regulator is out of order - Repair the contact or replace the regulator
The contact of the sensors of the engine management system is broken or the sensors fail - Restore contact or replace the faulty sensors
Exhaust gases toxicity increased
CO adjustment is broken - Adjust the CO content with the adjusting screw on the mass air flow sensor
The tightness of the valves is broken - Grind the valves
Flinger seals worn out - Replace seals
The contact of the coolant temperature sensor is broken or the sensor is out of order - Repair the contact or replace the sensor
Wear of parts of the cylinder-piston group - Repair the engine
The engine does not develop full power
Air filter dirty - Replace filter element
Clogged fuel filter - Change filter
Air throttle not opening fully - Adjust damper actuator
Decrease in fuel pump performance - Replace pump
Engine overheating
The tension of the water pump and generator drive belt is loose - Adjust the belt tension
Thermostat is defective - Replace the thermostat
Insufficient amount of liquid in the engine cooling system - Add coolant
Heavy contamination of the radiator - Rinse the radiator with a jet of water
Fan motor defective - Check fan motor, relay sensor. Replace defective nodes
Water pump defective - Replace pump
Low oil pressure
Faulty or clogged oil pump relief valve - Wash valve parts or replace defective parts
Motor overheating - Eliminate cause of overheating
Worn oil pump parts - Replace pump
Worn main bearing shells - Replace bearing shells
Increased oil consumption
Worn or coked piston rings - Repair the engine
The crankcase ventilation system is broken - Flush the system parts
Flinger seals worn out - Replace seals
Oil leak through gaskets and seals - Eliminate leakage, if necessary, replace gaskets and seals
Engine knock
Hydraulic pusher failed - Replace hydraulic pusher
The hydraulic chain tensioner is out of order - Replace the hydraulic tensioner
The connecting rod and piston group is worn out - Repair the engine
Worn chain tensioner shoe - Replace shoe
Broken valve spring - Replace spring