Skip the auto shop - Our mechanics make house calls

Q: Knocking noise

asked by on

I had my heads changed out because of some broken bolt in the exhaust manifold now I have a loud engine knock at low rpm's

My car has 85000 miles.
My car has an automatic transmission.

A: A handy and skilled technician can usually ...

A handy and skilled technician can usually drill out and repair a broken bolt. but if the area has very limited access, some parts may need to be removed. If the knock is coming from the engine internals, there is a good chance there may be need for a rebuild. Check the oil for the proper level and the presence of any fine metal shavings. A YourMechanic certified technician can come to your home or place of business in order to perform a noise from engine or exhaust inspection to diagnose the issue and suggest any repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car shut down and won't start

Unfortunately, what you describe doesn't sound good. My guess is that the noise you heard was a rod bearing, or other failed internal engine part. Continuing to drive the vehicle in that condition likely caused your engine to seize, which...

Q: Car will start and not start

I have seen may of these engines distributors get oil inside of them from leaking seals and this will cause failure of the crankshaft and camshaft sensors inside of the distributor. The distributor should be inspected to check if there...

Q: Car idling high

Unfortunately it looks like there can be a few different reasons as why your Ford Taurus is idling high. Some of these causes for high idling could be a failing Mass Airflow sensor, a faulty Idle Air Control Valve or...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...