Skip the auto shop - Our mechanics make house calls

Q: Replacement engine running rough.

asked by on

I had my engine replaced with a used engine. It sounds like there are marbles in the engine, and it has been running rough and stalling while I am driving. I think the engine bolts might be missing as well.

An engine that sounds like marbles running in a dryer is a classic description of pinging or pre-detonation, this is a sign of major engine malfunction. This in addition to the rough idle and stalling makes me wonder the quality of the used engine before it was installed. Concerning the missing engine bolts, are there clean metal bolt holes where the bolts might have used to been? This could be the sign of careless installation and may shine some light onto what is going on inside your current engine. I would suggest having a certified mechanic diagnose the problem and document everything (pictures) you might need it to prove your case later down the road. Used engines are always a gamble if you can’t verify where it came from, next time try to get a time/mileage warranty in writing to help safeguard yourself from this happening.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine belt and fan turned off but air is still flowing

Hi there. Typically this type of situation is caused by a broken AC Condenser. When the condenser breaks, the flow of refrigerant is stopped at the condenser on the low pressure side, which can cause the engine to shut down...

Q: I have really bad shaking in my tires when I drive between 20 and 70 mph

Several things could be causing the shake you're experiencing: tires out of balance, defective/worn tires, worn struts, worn control arm bushings, worn tie rods, wheel bearings starting to fail, the list goes on. Start by having a local service center...

Q: Car cranks, but won't turn over

There is a number of tests that would need to be done on this vehicle to narrow the problem down to an ignition, computer or fuel system problem. Have a mechanic like one from YourMechanic come and test the computer...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...