What are the symptoms of a car misfiring?

[LeoLee]

When a car misfires, it typically manifests as: abnormal engine operation or insufficient power, uneven engine performance with rhythmic vibrations at high, medium, and low speeds, and black smoke accompanied by popping sounds from the muffler. Below is a detailed introduction to car misfiring: 1. No fuel. Remove the fuel injector, place an oil container underneath. Start the engine and observe the fuel injection quality. Normally, it should be intermittent with strong atomization. If there's no fuel, continuous fuel flow, or no atomization, check the fuel injector, connecting wires, and TCU. 2. No compression. Remove the spark plug and use a specialized engine cylinder pressure gauge to measure the pressure. Fully open the throttle and start the engine. Observe the highest reading on the gauge and compare it with adjacent cylinders; the difference should not be less than 5%. Areas to check include the cylinder head gasket, intake valve, exhaust valve, and piston rings. 3. No spark. Remove the spark plug, attach it to the high-voltage wire, start the engine, and observe the spark produced. A normal spark is white; if there's no spark or the spark is red, check the spark plug, high-voltage wire, and ignition coil.