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: Can an alternator be damaged when replacing the water pump?

The coolant that may have leaked from the water pump could have gotten into the alternator which could short it out. You should test the alternator and recharge the battery. You can also have a qualified mobile technician come to...

Q: Start then stall - 2011 Chevrolet Malibu

Hey there. This may be related o a few different things, but is likely related to a fuel delivery issue. Since the car will restart again each time, we know there is not an issue with spark. This may be...

Q: How do I scan the tracks?

The scanning feature can be used for CDs, to help you figure out which track to play. To use the feature, simply press the Scan button. The system will then play the first ten seconds of the next track, and...

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...