Skip the auto shop - Our mechanics make house calls

Q: Rough idling, engine shuts off

asked by on

Recently, my car has been idling roughly. Then, it would just shut off. This happens out of the blue and there are no warnings whatsoever. The dash isn't showing any lights on. What could cause this?

A: Hey there, thanks for writing in about your...

Hey there, thanks for writing in about your 2005 Buick Rainier. This could be a variety of possibilities, but what you are describing sounds like a faulty O2 sensor. The O2 sensor relays information about the air/fuel mixture to your car’s computer and the computer makes modifications to this mixture continuously. If this sensor is faulty, it will cause inaccurate information to be relayed to the computer and therefore inaccurate adjustments to be made to the air/fuel mixture resulting in a rough idle. To be sure, I would recommend having an expert from YourMechanic come out to your car’s location to diagnose the rough idling problem and help you move forward with 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!

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: brake and abs light won't go off after replaceing brake pads and ft. rotors.

Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the ECU...

Q: Car stalling at first start, black smoke from exhaust

Hello. There are a few possibilities for why your car is stalling when you first start it. Your car’s coolant temperature sensor could be sending the wrong information to the PCM, which will cause the PCM to send the wrong...

Q: Voltage Regulator

The voltage regulator on your car is integral to the alternator. If you have diagnosed your charging or electrical failure as due just to the voltage regulator, you should request GM part number 15926088. See also GM TSB (technical service...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.