Blown engine or dead transmission: fix the car or sell it?

A knock that turns into a bang, a cloud of smoke on the Bishop Ford, or a transmission that slips and then won’t move at all. When the most expensive part of a car fails, the repair quote often lands close to what the car is worth. This guide helps you decide, and covers what to do if selling makes more sense.

Step 1: get the diagnosis in writing

Before deciding anything, know exactly what failed and what fixing it costs. Illinois gives you real protection here. Under the Automotive Repair Act, a shop can’t start work for pay over $100 without your authorization after its disclosures, and it must either:

• give you a written estimate for parts and labor and not charge more than 10% over it without your consent, or
• give you a written price limit and not exceed it without your consent.

The estimate must include all charges, including any charge for the estimate and diagnostics, and an estimate of the time needed if the job takes more than one working day. The shop must also offer you the choice to waive the estimate, so read before you sign. Sources: 815 ILCS 306/15 and 815 ILCS 306/20.

Ask the estimate to list whether the replacement engine or transmission is new, rebuilt or used; the Act requires the major parts and whether they are new or used to be described.

Step 2: do the math

There is no fixed rule, but three numbers decide it:

1. The repair total, from the written estimate.
2. What the car would be worth running, after the repair, given its age, miles and everything else wrong with it.
3. What the car is worth as it sits, which is our offer or another buyer’s.

When the repair bill is bigger than the difference between the second and third numbers, fixing the car costs you money. Then add what the estimate doesn’t show: rust, worn brakes, an emissions failure, tires. A new engine in a car with a rotten subframe is still a car with a rotten subframe. If emissions is also an issue, our failed emissions test guide explains the waiver rules.

Step 3: if you sell, sell it whole

Owners sometimes try to sell the failed engine or the good parts first. Usually that lowers the total, not raises it:

• A car with its engine and transmission in place, even blown, is worth more to us than a shell.
• A missing catalytic converter or wheels lower the offer too.
• Pulling heavy parts at home takes tools, time and space many driveways don’t have.

Tell us what failed and what’s still on the car. The offer we give on the phone holds at pickup if the car matches, and it doesn’t expire.

Where the car is matters

A car with a dead engine is often stuck where it failed: at a repair shop, on a side street or in an apartment lot. We pick up from any of those once the shop bill is paid or the lot manager agrees. A car left on the street can turn into a village problem quickly, so read our inoperable vehicle rules by village if it’s parked out front. For a truck or van with the same problem, see junk box trucks and semis or our non-running cars page.

Next step

Have the estimate in hand? Request an offer or call (708) 578-8868 and compare the two numbers. We buy cars with blown engines and transmissions across our area, from Sauk Village to Ford Heights. Read more on the articles page.