The newly bought second-hand car lacks power. What's wrong?

Check whether the four wheels are short of air and check the tire pressure. Check whether the oil is added too much or the viscosity of the added oil is too high. If you add too much oil, let out some oil and put it in the middle of the dipstick scale. Spark plug electrode ablation, when spark plug electrode ablation is serious, the spark gap increases and the engine power is insufficient. Another reason is that the nozzle is blocked. Nozzle blockage will lead to insufficient oil supply and poor gasoline atomization effect.

Check whether the signals of air flow meter, throttle position sensor, crankshaft position sensor, camshaft position sensor and oxygen sensor are normal. In the driving force output by the engine, it takes some time to overcome all kinds of loads and resistances, and then the rest is to really make the vehicle run. If the load consumes more driving force than before, then you will feel less power. The air conditioner compressor is driven by the engine. If the weather is very hot, the load of the air conditioning pump will increase and some electricity will be cut off. It is normal for air conditioning power to weaken, especially for small displacement engines.

ECU failure, car panel program or its own problems may lead to serious power decline. ECU failure will affect the intake and fuel injection actions of the automobile engine, and it may also enter the engine protection mode ... Replacing the redundant exhaust pipe with large aperture and high acoustic wave is an entry-level project of modification. However, under the premise that the power system has not been greatly improved, the effect of simply replacing the exhaust system on power improvement is not obvious. On the contrary, the large-aperture exhaust tail drum is easy to lose low torque.

The leakage of fuel system is mainly due to the unsealing of fuel pipe joint and fuel filter sealing ring, which makes the fuel system suck a lot of air and cause insufficient oil supply. Find the missing parts one by one and get rid of them. Find the air intake system: the engine of the car must be able to run, except for oil and air, otherwise the engine will not run smoothly. The most likely air intake problem is the blockage of the air filter or throttle system.