Blown engine or failed transmission: repair it or sell it?

The moment it happens

It usually announces itself. A knock that gets louder on Lake Shore Drive, then a bang and a cloud of smoke. Or the transmission that slipped for weeks finally won’t go into drive, and the car sits in the alley behind your building in Rogers Park, going nowhere. Now you’re choosing between a large repair bill and a car you’ll have to have towed either way.

This guide gives you a way to decide without guessing. If you already know you’re done with it, get an offer here and skip ahead.

First, confirm what actually failed

“Blown” covers a lot. Before deciding anything, have a shop diagnose it in writing, because a few problems sound worse than they are and some sound smaller than they are. A no-start after a long sit can be a battery, not an engine; our guide to a car that won’t start after winter covers the cheap checks first. A transmission that won’t shift can sometimes be a sensor or a fluid problem.

Ask the shop for three things on paper: what failed, what the repair is (a used engine, a rebuilt one, a new one), and the full price including labor.

The written-quote test

You need three numbers, and none of them should be a guess:

1. The repair quote, in writing, from step one.
2. What the car would be worth fixed, from a private-party listing check for the same year, model and mileage in your area.
3. What it brings as it is, which is a junk offer. Ask us; it doesn’t expire.

If the repair costs most of the fixed value, the math is already against you: you’d be spending money to own a car worth little more than you put into it. If the repair is small next to the fixed value and the rest of the car is solid, fixing it can make sense.

Then count what’s coming next

A big engine or transmission failure rarely arrives alone on an older car. Before you approve the repair, ask the shop what else they saw while it was on the lift:

• Rust, especially on the frame and brake lines. Chicago winters and road salt are hard on undersides.
• Suspension and brakes, which wear out on potholed side streets.
• Tires, the battery, the exhaust and the catalytic converter.
• Whether it can pass emissions. In Illinois, the Air Team says a vehicle “must pass an emissions test” before its registration can be renewed. A rebuilt engine that won’t pass is a problem.

If two or three of those are close behind, the repair is buying you a few months, not years.

When the car can’t move

A car with a seized engine or no drive gears isn’t going anywhere under its own power, which matters on the North Side. A car stuck on a street-cleaning block or a permit block is on a clock; the Chicago rules are in our guide to abandoned cars. Get it into a private spot or sold before tickets pile up.

We tow non-runners for free, from the curb, the alley or a garage, and we don’t need it to roll on its own, though it helps to know whether the wheels turn and whether it’s in park. See how we buy cars that won’t start.

If you sell it privately

Some people would rather list a car with a blown engine for a mechanic to buy. That can work, especially for a model people like to fix. Be clear in the ad about what failed. A buyer who finds out after paying is a buyer who comes back. And plan how they’ll get it home, because they can’t drive it.

The next step

When the quote doesn’t add up, sell it. Request an offer or call (708) 858-5673, any day between 8 a.m. and 7 p.m. We pick up in Rogers Park, Edgewater and across the North Side, tow it free and pay you when it’s collected. More reading is in our guides, and the what we buy page lists every vehicle we take.