Skip the auto shop - Our mechanics make house calls

Q: Car stalling at first start, black smoke from exhaust

asked by on

I've had troubles with my car stalling out, when I first try to start it in the morning with the engine is still cold. I went to the dealership several times with no answer to why this keeps happening. Now, I've noticed that there is a huge amount of black smoke coming from the exhaust. What might cause this? What kind of repairs can I expect?

Hello. There are a few possibilities for why your car is stalling when you first start it. Your car’s coolant temperature sensor could be sending the wrong information to the PCM, which will cause the PCM to send the wrong amount of fuel to the fuel injectors. It is also possible that the mass airflow sensor is sending a false reading to the PCM as well.

The black smoke from the exhaust could be due to oil leaking onto the spark plug tubes and then being burned by the engine. If this is so, replacing the valve cover gasket and oil tube seals should solve that problem. Have a certified technician, like one from YourMechanic, come and complete a diagnosis in order to determine why your car is stalling first before proceeding with replacing any parts.

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!
  1. Home
  2. Questions
  3. Car stalling at first start, black smoke from exhaust

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 shakes

The engine computer would need to be scanned to see if the engine is misfiring. That would lead to a possible coil, or spark plug failure. Depending on your car's mileage, there may be a coil and plug issue. I...

Q: Car stalling when put into gear.

The idle control valve is the most likely cause and is the most common of problems with the vehicle for a low idle problem. You may also need to clean the throttle body and its passages with the idle control...

Q: Intermittent problem with car not starting and not cranking

Hello. This is caused by a loss of voltage someplace in the electrical system. Most of the time this is caused by a bad connection at the battery or a bad battery cable. I usually check and clean these connections...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.