What are the reasons for poor car performance?
2 Answers
There are several main factors leading to insufficient power: 1. Fuel supply system issues: Blockages in the fuel tank vent hole, fuel tank switch, fuel filter, or fuel lines between the tank and carburetor can restrict fuel supply, resulting in an overly lean air-fuel mixture and reduced engine power. 2. Ignition system problems: Incorrect ignition timing or premature ignition can cause early combustion and knocking of the air-fuel mixture. Faults in the ignition system may lead to spark plug misfires or weak sparks. 3. Cylinder compression pressure: Severe wear of pistons, piston rings, or cylinders increases clearance between components, reducing sealing effectiveness. This causes cylinder head leakage, lowering compression pressure. Poor crankshaft case sealing also reduces suction. Improper valve clearance adjustment or incorrect valve timing affects cylinder pressure, decreasing engine power. 4. Engine overheating: Incomplete combustion from various causes leads to excessive carbon buildup in combustion chambers, impairing heat dissipation. Increased engine load then causes overheating. 5. Improper crankshaft lubrication: Too much or too little oil, contaminated lubricant, or blocked oil passages can all negatively impact engine power output.
I've encountered power loss issues quite often, and driving various cars has helped me figure it out. Common causes include ignition system problems, such as worn spark plugs or faulty ignition coils, leading to poor ignition; a dirty fuel system, clogged fuel injectors, or insufficient fuel pump pressure, affecting fuel supply; an air filter that hasn't been replaced for too long, completely blocked, reducing airflow and making the engine struggle. Additionally, issues like a clogged catalytic converter in the exhaust system increase backpressure and reduce power; underinflated tires or loose drive belts can also hinder acceleration. Once, I was driving an old car with sluggish acceleration and found the fuel filter clogged with debris—replacing it immediately restored performance. Long-term neglect leads to carbon buildup, making the engine as sluggish as if it were rusted inside. Poor power not only increases fuel consumption but also makes overtaking dangerous. I recommend regularly checking spark plugs and filters, and using cleaning agents while driving at high speeds to clear carbon deposits. In severe cases, visit a professional shop to read fault codes with a diagnostic tool—don't wait until a major repair is needed.
