What Causes Lack of Engine Power?

[EverettLee]

Engine lacks power due to the following reasons: Insufficient cylinder pressure: Severe wear of pistons, piston rings, and cylinder walls leading to insufficient cylinder pressure; valve burning causing insufficient cylinder pressure; excessive valve clearance (resulting in poor intake) or insufficient clearance (leading to incomplete valve closure); Incorrect ignition: Faulty ignition timing and related components (such as ignition coils, spark plugs, igniters, triggers); incorrect valve timing; excessive carbon deposits in the cylinder altering the engine compression ratio and reducing power; Substandard fuel grade: Substandard fuel grade causing engine knocking and power loss; severe clogging of the "three filters" (oil, fuel, air filters); additionally, excessively high engine temperature can also lead to reduced power.