A clunk noise when starting your car is generally a bad sign. It could mean that the engine is about to seize. It is also a sure sign that you will need to have it checked out by a professional. In this article, WhoCanFixMyCar looks at five things that may be causing your car to make a clunking sound.
The first thing that you should do if your car starts making a clunking noise is to check the fuel pump, cat or alternator. If these are all fine then it is likely that there is an air bubble in the fuel line and this will work itself out of the system over time.
If you have a newer car that is fitted with an automatic transmission, then the clunk noise may be caused by a problem with the flex plate. This is a metal disc found in automatic transmission vehicles that connects the engine's output to the input of the torque converter. If this begins to fail it will produce a rhythmic clunking sound and will need to be replaced.
If you hear a clunk when driving on rough roads or over speed bumps it could indicate that your suspension is beginning to wear out, especially the shock absorbers. These are the components that transform the kinetic energy of your car's movement into a different form of energy that can be dissipated by friction and the other mechanical components in the suspension system.