2. Excessive smoke coming from the exhaust pipe. This can be a sign of a blown head gasket, which allows coolant to enter the combustion chamber and be burned.
3. Engine misfires or feels like it's running rough. This is a sign that some or all of the cylinders are not firing properly, which can be caused by a blown head gasket, damaged piston rings, or other issues.
4. Engine overheating. This can be caused by a blown head gasket, which allows coolant to leak out of the engine, or by a damaged cooling system.
5. Engine seize-up. This occurs when the engine components are damaged to the point where they can no longer move properly. This can be caused by a variety of factors, such as overheating or lack of lubrication.