Common Engine Faults?
2 Answers
Common engine faults include: 1. Engine shaking when cold; 2. Engine shaking when hot; 3. Abnormal engine noise; 4. Engine carbon buildup; 5. High engine coolant temperature. Engine shaking occurs during hot idle. Reasons for hot idle shaking include: engine misfire (typically checked via spark plugs, ignition coils, fuel injectors and fuel lines), exhaust blockage, fuel grade mismatch, engine carbon buildup, throttle valve carbon deposits, and loose engine mounts. Carbon buildup primarily forms due to incomplete combustion during engine operation, where impurities in fuel and engine oil create gummy residues that accumulate as carbon deposits. Carbon buildup can cause engine shaking, increased fuel consumption, difficulty starting, unstable idle, poor acceleration, and excessive exhaust emissions. The solution involves carbon deposit removal to alleviate these issues.
I've been tinkering with engines for years, and the most common issue is failure to start, often because the ignition system, like spark plugs, gets too much carbon buildup and burns out, preventing the current from passing and causing a no-start. Fuel system problems are also frequent—a faulty fuel pump or clogged injectors can lead to a sudden spike in fuel consumption while the car barely moves. Cooling system issues are even trickier, like a leaking radiator or a failed water pump causing engine overheating. Once, during a long highway drive, my temperature gauge shot up to red, nearly blowing the head gasket. I’ve also often heard knocking sounds, usually due to worn piston rings or insufficient oil, causing loud friction noises. These problems can range from a simple stall to complete engine failure, so I recommend checking your car every six months, especially changing the oil and cleaning the air filter to prevent major issues. Always watch for dashboard warning lights—timely repairs save big money and keep you safe.
