During engine operation, some malfunctions may occur:
- - the engine does not start;
- - the engine runs unstably;
- - high or low crankshaft speed at idle;
- - increased toxicity of exhaust gases.
Let's consider the causes and methods for correcting these defects and some others.
The engine does not start:
- Fuel supply is disrupted - Check the fuel pump fuse
- The fuel pump does not work - Check the condition of the contacts in the pump connections, pump relay and starting relay
- Valve timing is disrupted - Restore the phases at a service station
- The fuel system pressure relief valve is out of order - Replace the valve
- The fuel filter is clogged - Replace the filter
- The ignition system is faulty:
- The contact in the ignition coil and control unit circuits is broken - Restore the contact
- The ignition coil is out of order - Replace the coil
The engine runs unsteadily:
- Water entering the fuel tank - Drain the sediment from the tank
- Air suction through leaks in the intake system, crankcase ventilation or idle speed control - Eliminate leaks in the connections
- Intermittent or failure of one of the cylinders:
- - carbon deposits on the spark plug or spark plug failure - Clean the carbon deposits or replace the spark plug
- - broken injector contact or injector is out of order - Restore contact or replace injector
- - spark plug tip is broken - Replace tip
- - control unit is faulty - Replace unit
Intermittent or failure of two cylinders:
- - ignition coil is faulty - Replace coil
- - control unit is faulty - Replace unit
High crankshaft speed in idle mode on warm engine:
- Leaky connections of crankcase ventilation system hoses and idle speed control valve - Eliminate leaks in connections
- Idle speed control valve contact is broken or control valve is out of order - Restore contact or replace control valve
- Broken contact of control system sensors engine or sensor failure - Restore contact or replace faulty sensors
Increased toxicity of exhaust gases:
- CO regulation is disrupted - Adjust the CO content with the adjusting screw on the mass air flow sensor
- Valve tightness is broken - Grind the valves
- Worn out oil seals - Replace the seals
- Coolant temperature sensor contact is broken or the sensor is out of order - Restore contact or replace the sensor
- Worn out cylinder-piston group parts - Repair the engine
The engine does not develop full power:
- Air filter is dirty - Replace the filter element
- Fuel filter is clogged - Replace filter
- Air throttle valve does not open fully - Adjust throttle actuator
- Fuel pump performance drops - Replace pump
Engine overheating:
- Water pump and alternator drive belt tension is loose - Adjust belt tension
- Thermostat is faulty - Replace thermostat
- Insufficient fluid in engine cooling system - Add coolant
- Heavily contaminated radiator - Flush radiator with water jet
- Electric fan is faulty - Check fan motor, relay sensor. Replace faulty components
- Faulty water pump - Replace pump
Low oil pressure:
- Faulty or clogged oil pump pressure relief valve - Flush valve parts or replace faulty parts
- Engine overheating - Eliminate cause of overheating
- Worn oil pump parts - Replace pump
- Worn main bearing shells - Replace liners
Increased oil consumption:
- Worn or coked piston rings - Repair engine
- Broken crankcase ventilation system - Flush system parts
- Worn oil deflector caps - Replace caps
- Oil leak through gaskets and seals - Fix the leak, replace gaskets and seals if necessary
Knocking in the engine:
- Hydraulic tappet is out of order - Replace the hydraulic tappet
- Hydraulic chain tensioner is out of order - Replace the hydraulic tensioner
- The connecting rod and piston group is worn out - Repair the engine
- The chain tensioner shoe is worn out - Replace the shoe
- Breakage of the valve spring - Replace the spring
The cylinder is on the crankcase ornatyp, onyn bekitu bolttaryn kataitynyz.