Blown Engine: Replace It or Junk the Car?

Do not try to restart the engine to see what it does. If it has a knocking noise, smoke or no oil pressure, more cranking can add damage, and a fire is possible. Have it towed to a shop.

A good shop can usually tell you more with some basic tests. Ask which of these it ran, and what it found:

• Can the engine be turned over by hand? If it will not turn, it may be seized.
• Compression or leak-down test results, by cylinder.
• Oil condition: metal in it, or coolant mixed in.
• A camera look inside the cylinders, if the shop can do that.
• A check that a failed timing belt or chain or a head gasket is not the real cause. Those are different repairs, and may be smaller.

Also ask why it failed. If it overheated or lost oil, the cause may still be there. A new engine will fail the same way unless the leak, radiator or cooling problem gets fixed too.

Get written quotes for at least two options. We do not quote repair prices here, because they depend on the car, the shop and the parts, and only a real estimate can tell you.

An engine swap touches many other parts. Ask whether the quote includes each of these, or will come as a surprise:

• Fluids, filters, gaskets, belts and hoses.
• Reusing or replacing the water pump, sensors, motor mounts and radiator.
• Cleaning out the cooling system or oil cooler, if the old engine shed metal.
• Transferring parts from your old engine to the replacement.
• Any computer programming the replacement needs.
• What happens if the engine is defective: who pays labor to swap it again?

See our guide to reading a repair estimate for the rest.

It can be the right move, even on an older car. Lean toward replacing when:

• The body and frame are solid, with little or no rust.
• The transmission shifts well and the shop found no problems with it.
• Brakes, steering and suspension do not need big work soon.
• The cause of the failure is known and can be fixed.
• The written quote comes in below what the repair would add to the car’s value, or close to it.
• You could not buy a comparable car as reliable for the same money.
• It is a model with strong demand or one you plan to keep a long time.

If you are unsure about the value side, use our guide on finding what your car is worth.

These point the other way:

• Other big problems are waiting. The transmission slips, the frame has rust, or the shop lists more work due soon.
• You would be financing a repair on a car with a small value. Be sure you could still cover the next failure.
• No warranty you can use. A used engine with a short or parts-only warranty leaves the risk on you.
• The cause is not known. If nobody can say why it died, you cannot say what would stop it happening again.

A car does not need a working engine to have value. A private buyer may want it as a project, and if so, tell them exactly what happened and what the shop found. Or sell it for its parts and metal. Our guide on selling whole versus parting out covers the tradeoffs of doing that yourself.

If you plan to call us, please leave the car complete. An engine or other main parts pulled before the pickup can change things, because incomplete vehicles may carry a pickup fee or may be declined. A complete car with a dead engine is fine: we tow non-running cars for free on a flatbed and pay cash on the spot.