Skip the auto shop - Our mechanics make house calls

Q: Very low idling during cold start, stalling engine, 2007 Toyota Corolla

asked by on

Only during a cold start, the initial idling would be too low that the engine eventually stalls. On second startup attempt, idling goes up to usual level but goes down to below normal idling (i.e. less than 700 rpm) and engine may eventually stall. Usually takes about three attempts for a normal startup. Already replaced the IAC valve and sensor (i.e. since the idling also goes down when the air conditioning is turned on before) and MAF sensor (as advised by a local mechanic), but still no improvement. After a successful startup, the car drives normally without any problem. Am really out of options already so I hope you can help me.

My car has 73880 miles.
My car has a manual transmission.

A: The first thing you should do is scan the e...

The first thing you should do is scan the engine and repair any codes. Have the fuel vapor system checked to make sure you do not have any problems with a leaking purge valve leaking vapor into the intake when the engine is not running and then leaks even more vapor when you start up the vehicle. If system is not leaking, then have the spark plugs replaced after having the throttle plates cleaned and the combustion chamber and valves cleaned. The valves may have some carbon build up on them that will cause low rough idle even stall cold. If you want to have this done, consider YourMechanic, as a certified technician from YourMechanic, can come to your home or office to diagnose the cold start and let you know what should be done.

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: Is there any good reason to spend extra money on premium gasoline?

Premium fuel should only be used if the manufacturer recommends it. You will see it printed on the fuel gauge if you are required to use it. All fuels sold in the USA have cleaners in the fuel now. Some...

Q: Car will only reverse, and the key got stuck

Hello. It sounds like your ignition switch may have failed. This is a common problem with your type of car and most GM vehicles. I would typically use a voltage meter to test the switch. If the switch is not...

Q: steering

The problem you are experiencing is a hydraulic issue, something that an alignment will not cure. It's possible that the pressure valves in the power steering pump are extremely worn or even failed. This can cause pressurized fluid to move...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.