Skip the auto shop - Our mechanics make house calls

Q: car vibrating at idle

asked by on

When I'm driving my car, it feels fine. However, when I come to a stop, it starts shuddering. Having the AC on seems to make it worse. It feels like the car is dying and starting again. One of my friends thinks the car might be losing air when its idling. What do you think might cause this?

A: Since the AC compressor is driven off the e...

Since the AC compressor is driven off the engine crankshaft, turning the AC on puts more of load on the engine. This often intensifies any underlying engine performance problems.

I think your friend is referring to a vacuum leak, which could indeed be the cause. However, there are numerous potential causes for your concern.

The first step is to check for diagnostic trouble codes (DTCs) stored in the car’s onboard control module. These codes serve as a starting point for any further diagnostics.

I suggest you have a professional, such as one from YourMechanic, diagnose any DTCs you may have, and repair your vehicle.

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!

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: Engine

You should go with the same motor you had originally. If not you will run into fit problems and computer issues with the sensors after you try to start it. There will be less problems by going with same motor....

Q: When my car is idling at a stop sign, I have a rattle coming from the front right.

Hi there, thanks for writing in. If the noise is there even when the engine is running, then the balancer needs to be checked as well as the engine mounts. Either one of these will cause this to occur. I...

Q: My car is vibrating - 2005 Jeep Liberty

Hello. If your vehicle is making noises I would start by trying to identify where the noise and vibration are coming from. Noise and vibration, even at low speeds, can be caused by many things not all of them transmission...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.