Skip the auto shop - Our mechanics make house calls

Q: Engine stalling

asked by on

2003 Kia Sedona starts and runs for one minute then dies. Restarts and does the same thing. Threw a code the other day of cylinder two misfire. Cleared the code, still has the problem but hasn't thrown a code again. Changed spark plugs, they were very dirty dark with some ash on them.
My car has an automatic transmission.

Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition modules not working properly.

When the misfire results from a fuel related issue, this is commonly related to a lean fuel condition (lack of sufficient fuel supply to the motor). Fuel related misfires can be caused by many different things such as low fuel pressure, faulty or dirty fuel injectors, a faulty O2 sensor, a dirty or failing mass air flow sensor, a faulty or dirty idle air control valve or a vacuum or intake leak. When the fuel supplied to the combustion chamber is insufficient, this results in an ignition (spark) that is igniting a less than balanced load of fuel and air. This results in a misfire or an explosion in the cylinder that is much less powerful than the other cylinders. This creates a loss of power that resonates throughout the motor additionally causing other problems with ignition and fuel timing. Due to the number of different things that may cause an engine misfire, the quickest and easiest way to diagnose this type of problem is to hook the vehicle up to a scanning tool which will download any potential fault codes that may have registered in the vehicle’s computer as a result of the poor running condition. I would recommend having an expert from YourMechanic come to your location to diagnose your misfiring problem.

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: Confused about the type of belts in my car's engine

Your vehicle has three separate belts: One belt drives the generator and water pump; One drives the power steering pump and the air conditioner compressor; The third belt is the timing belt. Given that your vehicle is 16 years old,...

Q: how many o2 sensors does my vehicle have and where are they located?

Your vehicle uses two oxygen sensors. According to Alldata, there should be one oxygen sensor that is accessed just behind the rear cylinder head, just behind where the coils mount to the valve cover. The other oxygen sensor is mounted...

Q: SUV moves too slowly in reverse and when accelerating; dull clump sound in Drive

The reason you cannot move very fast in the reverse setting is you have an internal leak in the transmission valve body. The clunk is the valve body moving back the other way, and the clunk is the transmission engaging....

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...