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: Check engine light on, engine knocking, loss of power, and coolant leaking.

Hi there. Grab a flashlight and look under the vehicle for where the coolant leak is coming from. Either there is a gasket, hose, or freeze plug that is leaking causing the coolant to leak or the engine has cracked....

Q: Transmission

Hello, This may be a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a...

Q: What precautions should I follow with the rearview camera?

While your car’s rearview camera offers greater safety by providing you with a direct view behind your vehicle, there are quite a few precautions that you should follow regarding this system. Here’s a quick rundown: If you’re towing something,...

Related articles

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.