How to Check the Manufacturing Date from a Car's VIN?

[LaEdward]

The reasons for low cylinder pressure include: 1. Excessive side clearance or end gap of the piston rings, or the first seal of the piston rings being worn out, leading to poor sealing; 2. Excessive wear between the piston and cylinder, increasing the clearance, causing the piston to wobble during movement, affecting the proper sealing between the piston rings and cylinder; 3. Piston rings sticking or carbon deposits in the ring grooves, preventing the rings from exerting their elasticity and losing the first sealing surface between the compression rings and cylinder wall; 4. Cylinder scoring, which damages the sealing between the piston rings and cylinder; 5. Incorrect installation of the timing gear, incorrect keyway on the gear, severe damage or wear of the timing gear, or looseness between the camshaft timing gear profile and the gear; 6. Use of mismatched cylinder heads, such as those with different combustion chamber volumes, which can affect cylinder pressure if installed incorrectly.