Skip the auto shop - Our mechanics make house calls

Q: My car starts and dies out and after that it only idle

asked by on

My Mercedes Benz A60 class start and dies out in the morning normally at temperature below 30 degrees . When it does that it will only idle and never start again. When l turn the key after it dies it produces a sound like when you are biting a wood. After an hour and when temperature picks it then starts.

Now even if the temperature is so high sometimes it just starts and dies out.

What might be the problem

My car has 150000 miles.
My car has a manual transmission.

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: Engine gets hot and shuts down but has spark - 1989 Mercedes-Benz 300CE

Hi there, thanks for writing in. The fuel pumps in the fuel tank may have been damaged from debris in the fuel tank damaging the motors. Remove the fuel tank pumps and look inside the tanks to see if there...

Q: Why Does It Take a Long Time for a Heater to Warm Up in Winter?

The heater in a vehicle gets its warmth from the engine. The engine has to warm up, and heat up the liquid coolant circulating throughout the engine, before any heat is available for people comfort. During winter, when outside temperatures...

Q: emmissins test says i need oxygen sensor heater

Hello, thank you for writing in. The error message you got about the low threshold means the oxygen sensor has failed, the fuel system is off, or the catalytic converter is having issues. The amount of information available isn't enough...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.