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.

A: An engine that sounds like marbles running ...

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: Rebuilt & replaced engine confirmation

The rebuilt engine depending on how it came will depend on if the outer engine covers and components were reused. Some engines will come complete with all components and just remove and drop in the new motor and other engines...

Q: One of the relays is clicking and draining the battery

There could be a parasitic draw involving the relay that is keeping it engaged. Lexus specifications for parasitic draw with the key off is approximately 50 milliamps. Anything over this amount indicates a parasitic draw. You could remove the fuses...

Q: Rough idle falls on its face any throttle passed half 0p0420 0p0430 0p0300

First off, the P0420 and P0430 both refer to a catalyst efficiency problem, while the P0300 and P0302 codes refer to a misfire problem. If you are certain that the issue is not with the ignition system, then I would...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.