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Section VI. Daily and periodic maintenance
4C20 Gasoline Engine Repair Manual
(7) When measuring emissions at idle, warm up the engine and 3-way catalytic converter first, then measure
emissions at high idle and then at low;
(2) To avoid possible deposits of carbon deposits in the engine and exhaust system, operate
touch the accelerator pedal as this may damage the clutch.
(8) Recommended ways to warm up the catalytic converter:
(3) Electronic anti-theft system
tirovat the car at high engine speeds should be as rare as possible;
1. Daily and periodic maintenance
• Drive in 3rd gear at 70 km/h for 5 minutes. Measure the level of harmful emissions within 8 minutes from the
end of the trip;
(a) Fuels and lubricants
(3) If the check engine light comes on while the engine is running, try to
• Depress the accelerator pedal so that the engine runs at speeds above 4500 rpm for more than two minutes.
Measure emissions within 2 minutes of the end of warm-up.
(c) Accessories
(1) The content of lead and other heavy metals in unleaded gasoline must comply with national standards, since
these metals can cause poisoning of the oxygen sensor and 3-way catalytic converter;
you can quickly determine the cause of this malfunction and eliminate it;
(1) Air conditioning system
When installing a standard anti-theft system, it is forbidden to turn off the power to the engine control unit.
The engine control unit anti-theft system must be approved by Delphi;
(4) In the event of a misfire in any of the cylinders, repair it immediately after stopping the vehicle. If this is not
done, combustion of the incompletely burned air-fuel mixture will occur in the exhaust manifold, resulting in
immediate damage to the oxygen sensor and 3-way catalytic converter. If the problem cannot be rectified
within a short time, disconnect power from the fuel injector of the misfiring cylinder and drive at low speed to
the nearest workshop for repair.
To install an air conditioning system in a vehicle that was not factory equipped with such an air conditioning
system, or to completely replace the air conditioning system, you must first check the engine power and make
sure that the control interface and signal wire are present in the system harness. If the generator power is
insufficient, the full operation of the system is impossible due to the lack of electrical power while the vehicle is
moving in modes close to full power. In addition, if the signal wire and the air conditioning control interface are
not connected to the engine control unit through the wiring harness, the auxiliary functions of this system are
unlikely to be available;
(2) The sulfur content must also comply with the national standards, since its high concentration can also cause
poisoning of the oxygen sensor and 3-way catalytic converter. In case of poisoning of devices with sulfur, in
order to reduce the danger, it is necessary to drive a car at a speed of 70 km/h for 10 minutes. Typically, at
high sulfur content, the color of the fuel becomes dark brown;
(2) Expansion tank
(5) If the battery voltage is not high enough or the starter motor is defective, do not drive the starter from an
external power source for a long time, because when the crankshaft starts to rotate, fuel injection will begin
if the system is energized. If the engine is not operated for a long time, unburned fuel accumulates in the 3-
way catalytic converter, causing damage to the catalytic converter when the engine is started;
(3) Engine oil consumption must be correct. If engine oil enters the cylinder and burns there, the phosphorus
formed during combustion can cause failure of the oxygen sensors and the 3-way catalytic converter.
(b) Daily and periodic maintenance
(6) To clean the fuel injector under normal conditions without removing it, use products that do not contain
substances that can damage the oxygen sensor and 3-way catalytic converter;
To increase the volume or install a new expansion tank for the use of an auxiliary heater in a car that is
operated in a cold climate, it is necessary to obtain the official consent of the car manufacturer, since the removal
of additional heat reduces the temperature of the engine coolant, which leads to increased engine wear, increased
consumption fuel, as well as the accumulation of soot in the engine and exhaust system.
(1) When starting the engine in cold weather, do not operate any machinery, including
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