What Causes Car Shaking After Ignition?
2 Answers
Car shaking after ignition can be caused by: 1. Low ignition energy; 2. Poor fuel atomization at low temperatures; 3. Fuel requiring higher ignition energy; 4. Increased spark plug gap due to prolonged vehicle use; 5. Severe engine carbon buildup; 6. Poor performance of the ignition system or weak spark plug firing; 7. Unstable fuel pressure. Solutions for car shaking after ignition: 1. If disassembling the intake tract for cleaning is not feasible, use a no-disassembly fuel system cleaning device, though the effect may not be as ideal as disassembly; 2. Consider replacing the spark plugs, or clean them and adjust the gap if possible for continued use.
The car shakes right after starting, which is quite a headache. There could be several reasons: the most common issue is with the ignition system, such as worn-out spark plugs or aging ignition coils, leading to poor ignition in some cylinders and causing engine instability. Fuel system problems are also frequent, like clogged fuel injectors or a weak fuel pump, resulting in uneven fuel mixture and incomplete combustion. Then there's the air system—a dirty air filter blocking the intake or leaks in the intake tract can affect air intake. Shaking more during cold starts in winter might be normal, but frequent shaking should raise concerns. I once experienced it due to carbon buildup in the idle control valve, which improved after cleaning. It's advisable to get it checked soon to avoid affecting driving and safety—a quick fix at the repair shop should do.
