What are the causes of engine speed loss?

[MacEliana]

Engine speed loss is caused by: a sudden increase in car fuel consumption. Introduction to Engine: An engine is a machine that can convert various forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. Engine Working Principle: The working principles of two-stroke engines and four-stroke engines are different, with the majority of car engines being four-stroke. The working cycle of a four-stroke gasoline engine consists of 4 piston strokes: intake stroke, compression stroke, power stroke, and exhaust stroke.

[StJuliet]

I've been driving for over ten years and have encountered engine RPM drops a few times. The scariest incident was when I was overtaking on the highway—the RPM suddenly dropped, the car couldn't keep up with the speed, and I almost had an accident. The mechanic said common causes include ignition system failures, such as worn spark plugs or leaking ignition coils, leading to intermittent sparks. Fuel supply issues are also frequent, like clogged fuel filters or dirty fuel injectors causing insufficient fuel delivery, making the engine lose power. Air intake problems are common too; a clogged air filter or a leaking intake pipe can make the engine 'struggle to breathe.' Prevention is straightforward: regularly replace the three filters, especially the air and fuel filters, every 20,000 kilometers to significantly reduce risks. Safety is paramount—if the RPM drops, gradually slow down, pull over, turn on the hazard lights, and wait for assistance. Don't push through. I've learned from experience that these minor issues can't be ignored, or else major engine repairs become costly and dangerous.

[VonLogan]

During car repairs, I often encounter engine RPM drop issues. The main causes include ignition system failures, such as spark plug erosion or coil damage interrupting ignition, leaving the engine struggling. Another common issue is fuel system blockages, where insufficient fuel pump pressure or carbon buildup in injectors leads to a lean air-fuel mixture. Sensor malfunctions are also frequent, like dirty mass airflow sensors or faulty oxygen sensors, causing the ECU to receive incorrect signals and misadjust RPM. Occasionally, the ECU itself may malfunction, requiring diagnostic tools to check error codes. Cost-wise, addressing minor components early, such as replacing a spark plug for a few hundred dollars, can avoid the thousands needed for a major engine overhaul. It's advisable not to ignore initial symptoms, which often appear during cold starts or uphill driving—monitor the dashboard for warning lights. Regular maintenance of the fuel system and sensors is key to extending engine life and avoiding roadside breakdowns.

[OZachary]

When I first started learning to drive, the engine RPM suddenly dropped, and I got so nervous that I panicked. It might have been due to insufficient air or fuel supply, or a computer control error. Simply put, the engine went on strike because it wasn't getting enough air or fuel. Park and check the warning lights—if none are on, try restarting. Newbies like me should always use good-quality fuel to prevent dirt from clogging the fuel injectors. RPM drops are the most annoying, especially when starting in the city—you press the gas pedal, and nothing happens, making you worry about holding up traffic. Remember the basic steps: park and turn off the engine, wait a few minutes, then restart and observe. If it still doesn't work, call a professional mechanic.