If any noises and knocks appear in a running engine, you should find out the cause of their occurrence and do not operate the engine until the malfunction is eliminated

In a cold engine, after starting, knocking of valve lifters and hydraulic tensioners may occur.

As the engine warms up to operating temperature, but no more than after 30 minutes, knocking should disappear.

Do not overheat the engine. If the coolant overheating indicator lights up, immediately stop the engine, identify and eliminate the cause of overheating.

The engine must not be operated with the emergency oil pressure warning light on. This will lead to scuffing of the bearings of the crankshaft, camshaft and failure of the gas distribution mechanism.

The warning light may come on when the engine is running at minimum speed in idling mode and during heavy braking.

The engine must not be operated with the diagnostic lamp on. The constant burning of the lamp indicates the presence of malfunctions in the engine control system.

It is necessary to diagnose the system and fix the problem as soon as possible.

Probable Cause - Remedy

Engine won't start:

a) air leakage into the intake manifold bypassing the mass air flow sensor - Eliminate leakage

b) violation of the installation of the timing phases - correct the installation of the timing phases

- Violation of the supply of gasoline

a) the electric fuel pump (EBN) does not work - Check the integrity of the fuse. Check the serviceability and reliability of the EBN connectors, the starting relay (PR) and the EBN relay. When the ignition is turned on, a characteristic sound should be heard for 2-3 seconds of Ebn operation.

b) the fuel pressure regulator is faulty - replace the regulator

c) the fine fuel filter is clogged - replace the filter

d) the fuel line is clogged or the water in the fuel line is frozen - blow the fuel line with compressed air

e) lack of fuel in the tank - pour fuel into the tank

- Faults in KMSUD

a) the gap between the electrodes of the spark plug does not correspond to the norm - check the gap with a round probe and adjust it

b) faulty spark plugs (shunting of the central electrode with soot on the insulator cone) - replace faulty spark plugs. When shunting with soot, eliminate the cause of the malfunction

c) no signal from the synchronization sensor (DPKV) - check the reliability of the connector and the serviceability of the sensor

d) there is no contact in the electrical circuit of the ignition coils, the control unit - check the serviceability and reliability of the connectors. Carry out a test run of the motor after each test operation of the connector

e) control unit defective - Replace control unit

Engine running erratically:

а) water ingress into the fuel tank - Drain sediment from the fuel tank

b) violation of contacts in the connections of the KMSUD harness - Eliminate leaky contacts

c) air leakage into the intake manifold bypassing the mass air flow sensor - Check connections, eliminate leaks

d) malfunction of the KMSUD wiring harness - Troubleshoot

e) contact failure in the ground circuit connections - Repair the problem

Interruptions or failure of one of the engine cylinders:

а) violation or contamination of contacts in the ignition system - Eliminate contamination or looseness of contacts

b) soot on the thermal cone of the candle - Replace the candle

c) the spark plug does not work - Replace the faulty spark plug

d) faulty ignition coil - Replace the faulty coil

e) no contact in the injector connector or injector malfunction - Check the connector on the injector or replace the injector

Increased idle speed with warm engine:

а) air leakage into the intake system bypassing the mass air flow sensor - Check connections, eliminate leaks

b) contact failure or failure of the electronic choke - Check the connector, replace the electronic choke

c) malfunction of the gas pedal position sensor or sensor circuit - Replace the sensor

d) increased gap between the phase sensor and the marker - Tighten the sensor mount

e) contact failure or sensor malfunction - Check the connector, replace the faulty sensor

e) other faults KMSUD - Troubleshoot

g) nozzles are leaking or their nozzles are dirty - Replace faulty nozzles

Increased toxicity of exhaust gases:

а) increased resistance to air flow in the intake tract - Clean the intake tract or replace the air filter

b) increased gap between the electrodes of the spark plugs - Adjust the gap or replace the spark plugs

c) valve leaks - Grind the valves

d) injector malfunction (clogging, leaks, poor spray) - Replace repair faulty injectors

e) violation of the timing phases - Correct the setting of the timing phases

e) increased oil loss - See "Increased oil loss"

g) KMSUD malfunction - Troubleshoot

h) converter malfunction - Replace converter

Engine not developing full power:

а) increased resistance to air flow in the intake tract - Clean the intake tract or replace the air filter

b) increased carbon deposits on the intake valves - Clean the valves from carbon deposits

d) increased resistance in the exhaust tract - Clean the exhaust tract or replace the parts of the exhaust system

e) violation of the timing phases - Adjust the phases

f) wear of camshaft cams - Replace camshafts

g) Excessive carbon formation in the combustion chambers - Clean the combustion chambers of carbon deposits or change the fuel and burn off the carbon deposits by driving at maximum power

h) the gap between the electrodes of the spark plug does not correspond to the norm - Check the gap with a round probe and adjust if necessary

i) low engine compression - Grind valves or repair CPG

j) Insufficient spark power - Replace the ignition coil or repair the fault

l) KMSUD malfunction - Troubleshoot

Insufficient fuel supply:

a) low fuel pressure - Replace the pressure regulator, fuel pump, fuel fine filter or clean the fuel supply line, fuel receiver

b) clogged injectors - Replace defective injectors

c) malfunction of the injector windings - Replace defective injectors

Engine overheating:

a) insufficient amount of coolant in the system - Top up the coolant. Check the tightness of the system

b) the thermostat is faulty - Replace the thermostat

c) burnout of the cylinder head gasket - Replace the gasket, check the non-flatness of the mating plane of the cylinder head

d) slippage of the drive belt of the aggregates - Replace the tensioner

e) violation of the circulation of the coolant - Flush the cooling system

f) malfunction of the water pump - turning the hub or impeller, wear of the impeller - Replace the water pump

g) contamination of the outer or inner surface of the radiator - Clean the radiator

h) insufficient rotation of the electromagnetic fan clutch due to slipping of the belt - Repair the fan or malfunctions

Low oil pressure or no pressure in the lubrication system:

а) jamming of the oil pump pressure reducing valve in the open position, breakage or weakening of the plunger spring - Eliminate the cause of the valve jamming or replace the plunger spring

b) clogged oil filter - Change filter

c) clogging of the mesh of the oil receiver of the oil pump - Clean the mesh

d) sticking of the anti-drainage valve of the oil filter after a long parking of the car - Change the filter

e) breakage or weakening of the spring of the thermal valve safety valve - Replace the spring

e) engine overheating - Eliminate the cause of overheating

g) increased clearances in the oil pump, wear of the pump gears - Replace the oil pump

h) increased clearances in the crank and gas distribution mechanisms in those units where oil is supplied under pressure - Repair the engine

i) low level in the oil sump - add oil to the recommended level according to the pointer

k) constant opening of the oil filter bypass valve - Change the oil filter

l) oil pump drive is faulty - Replace defective drive parts

l) poor quality engine oil or inappropriate for the season of operation is filled in - Change the engine oil. Flush the lubrication system

n) sensor malfunction or short circuit of the wire from the sensor to the signaling device to ground - Replace the sensor or eliminate the short circuit of the signaling device

Increased oil consumption:

- Oil leakage through stuffing box seals and gaskets

a) destruction of the seals and wear of the crankshaft under the sealing lip - Replace the seal. If the crankshaft is worn, use a spacer to install the oil seal

b) defect of sealing gaskets, warping of the adjacent plane of the part

c) clogging of the crankcase ventilation system;

d) suction valve sticking.

Increased oil burn:

a) high oil level in the oil sump - Drain excess oil

b) wear, coking of piston rings - Repair the engine

c) vacuum valve diaphragm rupture - Replace diaphragm

d) destruction of oil seals - Replace caps

e) the presence of shells or non-cylindrical holes for the valve sleeve in the cylinder head. enlarged clearance in mating valve sleeve - valve stem - Repair the engine

e) wear of CPG parts, cylinder seizure - Repair the engine

Oil carryover into the engine cooling system:

Cylinder head gasket leak - Replace cylinder head gasket.

Check for flatness of the cylinder head mating surface

Engine knocks:

a) wear of the crankshaft liners - Repair the engine

b) wear of the connecting rod and piston group - Repair the engine

c) wear of the CPG - Repair the engine

d) hydraulic valve lifter is defective - Replace the hydraulic pusher

e) Faulty hydraulic chain tensioner - Replace hydraulic tensioner

e) increased chain elongation - uniform noise in the front of the engine, increasing at medium speeds and variable loads - Check the increase in the length of the chains, if necessary, replace the chains with sprockets as a set

g) valve stem seizure in the guide sleeve - Repair the cylinder head

h) settling under load of the valve spring - Replace the spring

i) breakage of the spring of the automatic tensioner - Replace the tensioner

k) the crankshaft damper pulley is loose - Tighten the bolt

l) alternator bearing defective - Replace bearing

m) water pump bearing knock - Replace pump

n) knocking of the bearing of the guide roller of the drive belt - Replace the guide roller