Causes of car weakness
During use, some car owners may experience a situation where the car begins to operate less efficiently and is not as powerful as before. This phenomenon can come from many different causes.
Spark plugs are dirty and worn.
Spark plugs can become clogged with soot and carbon after long periods of use or improper maintenance. Spark plugs that are clogged with soot and carbon cannot produce a spark strong enough to ignite the fuel and air mixture.
Spark plugs can also be worn, the gap between the two electrodes is large, the air-fuel mixture burns inefficiently, reducing power.
Clogged fuel filter
This is the most common cause when the engine is weak, the engine may even die in the middle of the ride, but if the vehicle is stopped for a while, it can be restarted.
Worn fuel pump or leaking pressure regulator
The fuel pump supplies fuel to the fuel tank for combustion by the engine. It also responds to the engine's needs by regulating the fuel pressure. If it fails, acceleration will be poor and the vehicle may not start.
In case the fuel filter is replaced, the injection pressure is still low, some garages often assume that the pump is faulty and decide to replace it. In fact, many cases are due to a leaking or jammed pressure regulator, the fuel returning to the tank does not create pressure. The injection pressure is guaranteed but the amount of fuel entering the combustion chamber may still be lower than required. The reason is that the mass air flow sensor (MAF) or absolute air pressure sensor (MAP) responds slowly, transmits incorrect signals, and the ECU controls the injector opening time to be short.
Clogged exhaust pipe
An exhaust pipe consists of two filters - a muffler and a catalyst. Over time, exhaust gases accumulate in the pipe, causing the engine to expel them with more energy. High exhaust pressure also reduces the amount of air intake, leading to power loss.
Dirty air filter
Consider this if your car is frequently driven in a dusty environment. If this filter is clogged or has too much dirt, the amount of air passing through the filter will be reduced, thereby consuming fuel.
Therefore, users need to clean the air filter regularly according to the schedule stated in the vehicle's owner's manual, usually every 3-6 months.
High voltage wire is faulty.
The high voltage coils are responsible for converting electrical energy from the battery into sparks. With a damaged high voltage coil, the fuel and air mixture will not be proper.
A faulty high voltage wire can also cause the engine to not fire properly, causing poor engine performance. Therefore, people need to pay attention to replacing the high voltage wire if damage is detected.
Low compression ratio
This problem often occurs in vehicles that have had their oil changed infrequently or have been used for a long time. During the expansion stroke, high pressure gas passes through the gap between the piston and the cylinder or between the valve and the base, eliminating the compression pressure on the piston.
In severe cases, oil can enter the combustion chamber and contaminate the spark plug. Engine oil also gets dirty faster. This is a serious damage that requires overhaul. To determine the exact problem, you can check by pumping compressed air into the combustion chamber through the spark plug port and measuring the pressure drop during the compression stroke (all valves of the gas distribution system are closed).
To avoid these problems, regular and periodic maintenance of the engine ignition system is very important. Vehicle owners should follow the manufacturer's advice and instructions to maintain the performance and reliability of their vehicle for a long time.
