Q: Makes a loud clunk noise when I try to start it

asked by on

When I try to start my van it's makes a single clunk noise and I can hear my starter try to turn over but it won't do anything

My car has 180000 miles.
My car has an automatic transmission.

Hi there. Sounds like the engine may have water in the cylinder, fuel in the cylinder, or the timing chain may have broken. Try turning the engine over by hand with a breaker bar. If the engine will not move, then remove the closest valve cover to you and try rotating the engine at it can move. See if the rocker arms move. If the rocker arms do not move at all, then the timing chain has broken. If the rocker arms move, then I recommend removing all of the spark plugs and then try to crank the engine over by hand. If the engine is able to turn all the way over without hesitating or stopping, then there is water or fuel in the cylinders. This could lead up to either water getting in the cylinders from the air filter sucking in water or the head gasket may be split. If fuel is in the cylinder, then the fuel injectors could be leaking causing the cylinder to lock up. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your engine and determine what is causing it to not rotate all the way over.

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. Makes a loud clunk noise when I try to start it

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: Car headlights randomly turning on and flashing while car is off.

Hi there. Check all of the vehicle grounds to the lighting circuits and the ignition circuits. Make sure that the grounds are cleaned and tightened. A loose ground will cause circuits to malfunction and not work correctly. If you need...

Q: car crank not start, 2004 BMW 745i

The code you listed, P1727 indicates that the engine speed sensor is not providing a signal to the computer. Without knowing the position of the crankshaft, the ECM does not know when to inject fuel or when to ignite a...

Q: why is my car chugs and dies after a half tank of gas

The fuel pump may be starting to go bad, when you get below half a tank, the pump does not submerge in fuel as much to keep it cool and it will seize up and stall the motor. You will...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 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...