Q: Knocking when driving

asked by on

My car knocking when slowing down and changing gear

My car has 81000 miles.
My car has a manual transmission.

An engine can ping (or knock) due to an improper combustion process. An ignition knock is the result of combustion occurring too early. Early combustion can occur from carbon buildup inside the combustion chamber, a lean air/fuel mixture, and advanced ignition timing (spark plug firing too soon). In extreme cases, engine knock can be the result of a connecting rod failing which is a much larger problem that often times requires the removal of the engine to replace these bearings. I would recommend having an expert from YourMechanic come to your location to diagnose your engine knock.

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. Knocking 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: Why am I losing compression on cylinder #4 on my 2006 Mazda 6

Hi there. If you are feeling air pressure coming out of the engine in this area then you have a problem with warpage or a crack that is not seen. Once everything is put together and torqued then you should...

Q: My engine is knocking very loudly and I have a cracked radiator and an oil leak . I have a quote for 920 to repair everything is t

From what you've described, I have a feeling that you may need a lot more work done than your quote of $920 to fix this vehicle. Be aware that an engine knock can be an internal engine problem requiring an...

Q: Wobble when braking and speeds over 50 MPH

Hi there. This is typically caused by warped rotors. When the rotors are warped, the steering wheel will shake when applying the brakes. This is a common issue. I usually measure the rotors to see if they are good, but...

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...
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.