Q: 2007 Buick LaCrosse, startup noises

asked by on

When I start the car it's makes this clunck noise after I turn the key to start. No issues with starting just that bizarre noise. The engine revs a little then goes normal which I think is ok. I had a friend listen to it and said that's just how old GM cars sound when they start up. Should I be concerned?

My car has 185000 miles.
My car has an automatic transmission.

There are a number of things that could make an engine noisy when starting up. Depending on the specific type of sound you are referring to, this will determine how to properly diagnose. If there is a bit of a hissing sound, this may be a sign of a vacuum leak. If this is more of a shrieking sound, this may be a sign of a worn out or out of adjustment serpentine belt. If there is a bit of a howling or growling sound, this may be a sign of a worn out or low on fluid power steering pump. A rattling or pinging sound may be caused by an ignition problem. An engine can ping (or knock) due to an improper combustion process. A "spark 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). A clattering type sound may be a result of improper lubrication in the valve train which could be a more serious problem and should be addressed as soon as possible. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle to ensure everything is in proper working order.

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. 2007 Buick LaCrosse, startup noises

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: My car starts but then it has convulsions and shuts off

This may be caused for many different reasons, such as a misfire or a lack of fuel (which can also cause a misfire). The lack of fuel may be caused by low fuel pressure, dirty fuel injectors, bad connections to...

Q: My rear wheel is leaking bad - 2007 Chevrolet Colorado

It sounds like you have blown out a brake wheel cylinder piston. You should not drive the vehicle with no brakes. Have the brakes inspected and repaired as needed by a mechanic. You will most likely need, at the minimum,...

Q: My car cranked and ran for about 10 minutes. When I started to drive it shut off. Then it would not crank again.

The first thing to look for is air leaks. any air that gets into the engine without going through proper channels will lean out the system and cause problems. Look under the hood for any rubber hoses or boots that...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...