What are the symptoms of insufficient cylinder pressure?
2 Answers
Insufficient cylinder pressure may exhibit the following symptoms: 1. Deep grooves on the cylinder wall, loss of sealing between the piston, piston rings and cylinder wall friction pair, resulting in reduced cylinder compression pressure and loss of power. 2. Downward leakage of combustible mixture increases crankcase pressure, which may cause crankcase explosion in severe cases. 3. Severe smoke emission from the exhaust pipe, abnormal engine noise, and engine malfunction or even stalling. 4. Insufficient cylinder pressure affects combustion conditions, leading to inadequate power and torque, weakened vehicle acceleration performance, slightly increased fuel consumption, and decreased power performance.
Last week, my car always took a long time to start, cranking for ages before finally firing up. The engine idled so roughly that sitting inside felt unstable, and when accelerating, the car seemed sluggish, struggling even on small inclines. Fuel consumption also shot up—normally, a full tank could last 500 kilometers, but now it barely reaches 400. Turning on the AC made things worse; at red lights, the engine vibrated so much the steering wheel shook, making me fear it would stall. After dragging it to the repair shop, the mechanic said there was low cylinder compression, likely due to issues with the valves or piston rings. The repair won’t be cheap, and catching it earlier would’ve saved trouble.
