Skip the auto shop - Our mechanics make house calls

Q: Difficult startup with a lot of idling when it's cold

asked by on

My car has difficulty starting up when it's cold. It has trouble starting at 40 degrees and below. There is a lot of idling when it finally turns on. When the weather is warm, the car has no issues starting and runs great. The crank shaft position sensor is replaced on the car. I also had fuel pump relay and idle control valve changed. The issue persists still. What else can I check? Thank you in advance.

A: One of the main things that can prevent a v...

One of the main things that can prevent a vehicle from starting in the cold is the battery. Batteries for automobiles are rated by cold cranking amps. This measurement is the amount of amperage the battery can produce at zero degrees Fahrenheit.

If the battery is a few years old, it may not be producing the same amount of amperage that it once did in the cold. I would recommend enlisting the assistance of a qualified mechanic to come and test your battery. If the mechanic determines that your battery is not producing the correct amperage to start the car in the cold, it would be recommended that you replace the battery. Due to the fact that this test is related to the electrical system of the vehicle, it is best to have the hard start diagnostic performed by a professional, such as one from YourMechanic.

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: Hose leaking coolant

This is common as vehicles get older. Rubber components like belts and hoses have a 4-6 year life span. If the hoses in your vehicle are the original it might be time to change them all. This is something that...

Q: Low Tire Pressure light is on

You need to reset your TPMS system. This is done through the controls on your steering column. Consult your vehicle owners manual or look for a simple "how to" video such as this one here. If the system still will...

Q: Coil replacement - 2010 BMW 335i

Unfortunately, there is not enough information here to properly diagnose as a rumbling sound coming from an engine (especially a high performance engine) is somewhat normal in many cases. The service engine light could be on for many reasons. I...

Related articles

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...
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...