Blown engine? How to spot the symptoms before it’s too late!

Few things worry drivers more than finding out that their engine is "blown" or needs a full rebuild. In workshop slang, some also call it "motored," though it's not a technical term. Either way, we’re talking about an engine that has suffered severe damage, with performance so compromised that the vehicle could be rendered unusable if not addressed promptly.

This kind of failure is often linked to internal component wear, lack of maintenance, or improper use of the vehicle. That’s why it’s essential to recognize the warning signs.

How to detect a blown engine

Here are some of the most common symptoms that may indicate serious engine trouble:

• White or blue smoke from the exhaust: could mean worn piston rings or valve issues.

• Metallic noises or knocking sounds: clear signs of wear in components like connecting rods or the crankshaft.

• Loss of power or difficulty starting: usually caused by low compression in the cylinders.

• Frequent overheating: if the engine constantly overheats, it may already be severely damaged.

What to do if these symptoms appear

If your car shows any of these signs, don’t push it, turn off the engine immediately to avoid further damage.

The next step is to take the vehicle to a specialized shop so a trusted mechanic can perform a full diagnosis. Depending on the severity of the damage, the options may include:

• Performing an engine overhaul (commonly referred to as "rebuilding the engine").

• In more serious cases, replacing the engine entirely.

Prevention is the best strategy

Avoiding this situation is possible. The key lies in preventive maintenance:

• Stick to the recommended schedule for oil and filter changes.

• Use high-quality fuel.

• Regularly check the cooling system and coolant level.

• Avoid overloading or sudden, harsh acceleration.

If the damage turns out to be irreversible, purchasing a new or reconditioned engine may be the most viable solution, though it represents a significant investment. Still, it ensures your vehicle is restored to optimal condition and extends its lifespan.