Q: Top engine makes knocking noise and car stutters when driving

asked by on

A few days ago my car 2006 Audi AG Quattro started knocking loudly and car stuttered when driving. I have not driven the car since that day. Can you please help with diagnosis?

My car has 162000 miles.
My car has an automatic transmission.

Hello. A knock can be caused by a number of things. It can be as serious as an internal engine failure or it may be a misfire or a failure in the timing belt. When a knock occurs I always check the oil first. If it is low then there may be serious engine damage; I will typically drain the oil and look for any metal in it. If there is metal then the engine will need to be taken apart and inspected. If the oil is fine then I check the timing belt to make sure it is fine before I start it so I can then isolate the noise. If you are planning on having this knocking noise looked at, have a technician from YourMechanic come to your home or office to diagnose the knocking noise and replace the timing belt or make any other necessary repairs if necessary.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Top engine makes knocking noise and car stutters when driving

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: Control arm wishbone cracking

Hello. The inspection of the lower control arms are accurate, but what is cracking is actually the bushings in the wishbone's lower control arms. This is a common problem with Audi cars. A certified technician can help you with the...

Q: Car Knocking at 1600- 2100 RPM loaded condition

Most likely, the knocking under load you hear is worn connecting rod bearings. The top-end overhaul (including the valve job?) has increased cylinder pressure during the power stroke (assuming the valves were not sealing perfectly), exaggerating a "knock" that probably...

Q: I put a 4x4 (Jell Type Marine) battery in my sedan. Car starts and runs but loses power and completely stops.

Hi there. The battery is not holding a proper charge. Check the alternator and see if its producing a voltage of 13.5 to 14.7. If so, then have the alternator checked for the amperage that it puts out and see...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
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.