Skip the auto shop - Our mechanics make house calls

Q: Car won't start

asked by on

My car has no problem starting up when it's warm weather but when it's cold it will not I have got a new computer for it did not work I made new keys still didn't work an from time to time in the cold it will start up an run for a few seconds but then die I can't figure it out so what could it be?
My car has an automatic transmission.

As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your car in the morning and turn the key to on, the coolant temperature sensor immediately reads the temperature of the coolant and relays this to the computer indicating that the coolant is cold. The computer then knows at this point that it needs to enrich (add more fuel) the air/fuel mixture at startup due to the change in air density. When you start the car, you will notice that it idles high for a period of time until the engine warms up. This is the enrichment cold start process. This is done with what is called a cold start injector which injects more fuel into the motor until the engine reaches a specific operating temperature. The computer simply feeds a little extra gas through the fuel injectors to start the engine and then maintains a certain amount of fuel supply to the motor until it is warm. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle and diagnose your cold start issue.

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: Car not starting when it is warm

The cam sensor may be causing the problem but it should be setting a code when it does not start. The engine needs to be scanned when the no start is happening to see if you are getting a cam...

Q: Air intake noise

This metal scraping noise may be inherent to the metal tube. The original tube was designed to be quiet and not be noisey when opening throttle. The noise is from air flow disruption through the air tube. The metal tubes...

Q: Popping noise, wheels won't turn

For your 2001 Chrysler LHS, the inner tie rods are attached to the steering gear with a retaining bolt and a lock tab. If the bolts are not torqued enough and the lock tab engaged, the bolts can back out...

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 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.