Q: Knocking sound in engine when clutch is up

asked by on June 14, 2016

When the clutch is up, there is a knocking sound in the engine. When the clutch is pressed down, the knocking sound goes away. The car pulls slightly to one side and there is a growling noise when I change gears and accelerate and it shakes into idle. Several months ago the clutch was changed, but it still feels rough in the pedal. I’m wondering if the mechanic only changed the clutch and did not change the dual mass flywheel. Or it might be a release bearing, which hopefully I could change myself without the clutch or do both have to be changed at the same time?

Car is making a noise Inspection $79.99 - $99.99 Get a Quote

When the clutch is replaced, generally the clutch disc, pressure plate, throwout bearing, and pilot bearing are all replaced. These usually come in a kit, and when they are replaced, the flywheel is usually refinished based on need. If the throwout bearing has failed, it usually makes noise when the clutch pedal is pushed in but not when it is not pushed. Common causes of this would be a failed axle shaft, CV joint failure, or suspension failure. A qualified technician, such as one from YourMechanic, would be able to diagnose this knocking sound and perform any repairs required.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Our battery light came on. We got a new battery 2 days ago and got a new alternator yesterday

Noise under hood when shut off

Hi Alex. Thanks for contacting us tonight. In most cases, a beeping noise after shutting the car off is caused by an alarm that has been triggered due to a system or accessory left on. I would check to make...

When I turn off the car, power steering fluid over-flows from under the reservoir cap. 1999 Infiniti Q45

Hello - it sound like your power steering system has been over-filled with fluid, perhaps the wrong fluid was used (non-synthetic) and is foaming, or the fluid filter (in the reservoir) is clogged. I recommend a PS fluid service performed...

Hissing noise from bottom right side when accelarating

This may be a sign of a vacuum leak. High idle speed, stalling and hissing sounds are common signs of a vacuum leak. When a vacuum leak is present in an engine, this causes an excessive imbalance in the air/fuel...

Recently replaced the TPS but still get code P0122, what causes this low voltage?

Code P0122 may also indicate that you may have loose or poor connectivity to the throttle position sensor itself or potentially not enough voltage being supplied from the ECM. I would recommend having an expert from YourMechanic come to your...

Van shakes, makes knocking noise - 1993 GMC G2500

Hello. You will need to find out if your engine is misfiring due to an ignition part like plug wires, plugs, or distributor parts like a cap and rotor or the module. If all the tune-up maintenance is done to...

Engine rattling, shaking and loss of power

The VANOS unit or solenoid can cause a rattling sound from the engine. The VANOS is a camshaft timing system which runs off of engine oil pressure. If the oil is the wrong viscosity or the system has a buildup...

Power window not working

Hello! Commonly when a window stops working it is the window regulator causing the troubles. I suggest having a qualified technician, such as one from YourMechanic, check the window regulator and window switch to determine why your window is not...

Master cylinder missing a wire

Hello. The brake light can come on for a number of reasons. If the brake pedal feels fine, then the problem is usually electrical. If the only light that is on is the brake light it is typically caused by...

Related articles

Symptoms of a Bad or Failing Intermittent Wiper Relay
Common signs include the wiper blades only working on one speed or a different speed than you selected, not working at all, and making humming noises.
How to Replace a Head Gasket
The cylinder head gasket is a seal located between the engine block...
How to Troubleshoot a Clutch Pedal Sticking to the Floor
Clutch pedals in manual cars stay on the floor if there's a failed clutch release bearing, slave cylinder, clutch master cylinder, or clutch linkage.