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.

A: Engine misfires can be caused by many diffe...

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

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・Save up to 30%

Get a quote

What others are asking

Q: can i drive my car home from work when i found out i had a misfiring cylinder this morning?

A misfire can be caused by several components and if you should drive it depends on the issue that is occurring. Most likely if you made it to work without any major issues, you can make it back home. It...

Q: Is my transmission going in my car?

You need to have the computer tested for codes and the engine checked for a vacuum leak to the brake booster. This would account for the high idle and lack of brake power assist. The most likely cause is that...

Q: Rattle when cold engine - 2006 Ford Mustang

Hello. This could be a variety of many things and may be difficult to pinpoint without physically inspecting the car. Many cars tend to have small or subtle vibrations and rattles as fasteners, nuts, and bolts become loose over time....

Related articles

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...