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 racing too high

The coolant reservoir will need to be checked to see if it is leaking or if the engine has an overheating problem. The high idle may be due to a vacuum leak at a hose or a faulty throttle body...

Q: Car Cut off when I slow downs or stop

Hi There! It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate and eventually stall. The idle air control valve is a small valve on the engine's intake system that...

Q: Vibration

This sounds like you may have a worn engine or transmission mount. I would visually inspect each mount and check for wear or cracks in the rubber bushings. Over time, a worn or cracked bushing may not absorb the engine...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.