If the cylinder pressure is not enough, there will be a lack of power and a lot of smoke from the exhaust pipe while driving. If the cylinder pressure is not enough, the engine will be difficult to start.

Insufficient cylinder pressure is generally caused by an air leak in a part of the engine, or it may be caused by a large gap between the piston and the cylinder wall。

• If the piston and the cylinder wall clearance is too large, there will be oil burning phenomenon.
• If the engine burns oil for a long time, it will damage the three-way catalytic converter of the car and aggravate the wear and tear of the engine.
• If the cylinder pressure is not enough, the engine will have serious carbon accumulation, which is harmful to the engine.
• If there is a large amount of carbon accumulation on the top of the engine piston, it will increase the compression ratio of the engine and cause the engine to burst during the working process.
• If the engine bursts, it may cause the engine connecting rod to deform or the piston to burst.

Excessive piston ring wear may also cause cylinder pressure deficiency. Some cars can solve the problem of insufficient cylinder pressure by replacing the piston rings.

Insufficient cylinder pressure can also be caused by three piston rings.

A normal engine has three piston rings on each piston. These three piston rings have grooves. If they do not match, hot gases can enter the crankcase along this opening, resulting in insufficient engine cylinder pressure.