Skip the auto shop - Our mechanics make house calls

Q: cylinder 2 misfire.

asked by on

I have a cylinder 2 misfire on my car and i have changed the coil pack, fuel rod, spark plugs, fuel injectors and i went to a mechanic shop and he said its either a burnt valve or a blown head gasket and there is no white smoke leaking coolant or any other signs or a head gasket my question is from this information would you think its a burnt valve?
My car has an automatic transmission.

Engine misfires can be caused by many different things, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in 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. 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

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: Cylinders 4 and 5 are misfiring - 2007 Mercedes-Benz S55 AMG

Hello. Most of the time if there is a misfire on those two cylinders it is not caused by the computer. Typically it is caused by either failing spark plugs or an internal problem. I usually start by doing a...

Q: Fuse for turn signals going out

It sounds like you may have a short circuit somewhere. If there is any exposed wiring that is able to come in contact with a metal surface, this can cause the problem. I would recommend having a technician inspect the wiring...

Q: I drove the car fast, and then the Service Advance Trac came on. Then I drove the car slow for about 10 min and the message disappeared.

Hi there. The Advance Trac may have came on for a dirty wheel speed sensor. You could have driven through a puddle or on a bumpy road that caused debris to fall onto the sensor causing it to be tripped...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...