Skip the auto shop - Our mechanics make house calls

Q: When i start car in the morning, it vibrates with a rattling noise under

asked by on

When i start the car in the morning or when the car has been sitting for while there is vibrating. noise especiallywhen you engage in gear

My car has 152000 miles.
My car has an automatic transmission.

Hey there. This sounds like you may have a rough idling problem that tends to get worse once the car is put into gear. This can happen for a variety of reasons such as low fuel pressure, faulty fuel injectors or a dirty or failing idle air control valve.

Low fuel pressure will cause the fuel injection system to provide less than the required amount of fuel needed for the car to run smoothly. This may also be true when you have dirty or malfunctioning fuel injectors.

The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve.

If you would like to have this all checked, I recommend having a certified technician from YourMechanic can come to your home or office to diagnose the vibration issue and advise you on needed repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • When i start car in the morning, it vibrates with a rattling noise under

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: Need a diagnostic.

Most shops charge an hour of labor for a diagnostic. The price for this hour of labor can range anywhere from $90.00 up to $120.00. If you have your diagnostic performed by a technician from YourMechanic you can get this...

Q: I need to know what's the rattling noise the engine makes when I turn on the car

I would have to hear the noise to know exactly what the noise is since I have seen a serpentine belt tensioner make a knocking noise on these engines and it is an inexpensive repair to just replace the tensioner...

Q: Vehicle shakes

You should have all the tires checked for a bent rim. You can check this by having someone follow you while driving on the road. The other person can let you know if a problem is visually noticeable. Another alternative...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...