Q: Code P0303 cylinder 3 misfire

asked by on

Code P0303 cylinder 3 misfire, Engine studders sometimes when pressing on the accelerator. Engine light on and flashes when engine starts to studder.

My car has 81000 miles.
My car has an automatic transmission.

The symptoms you describe along with the blinking Check Engine Light and P0303 trouble code definitely tell us that you have a misfire in cylinder number 3.

Your engine uses a coil on plug system. This means each individual cylinder has its own spark plug and ignition coil. If you haven’t had a tune up yet, this may be an indication that one is needed. Though the manufacturer recommends replacing the spark plugs every 100,000 miles, spark plugs are considered to be a "wear" item. Over time, the gap between the contact and electrode of the spark plug increases and results in a weaker spark.

It is also possible that the ignition coil or possibly fuel injector may be duplicating this misfire condition.

Rather than guess, enlist the assistance of one of our certified technicians to come out to your vehicle and inspect your vehicle. They will be able to determine exactly what is causing your misfire and assist you with any repairs needed to get your Minivan running smooth again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Code P0303 cylinder 3 misfire

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 temp goes down when I stop or turn the heat on. 2013 Dodge Avenger

Hi there - the symptoms you describe indicate a thermostat that is not properly keeping engine temperature at the correct operating level. The thermostat should restrict flow as necessary (stopping or running the heater) to keep the engine at operating...

Q: Knocking sound when driving. Disasters when braking or accelerating.

If the knocking only appears when you are at cruise and becomes more frequent as you go faster, then you may have an axle inner joint or a transmission mount or engine mount issue. This may be why the noise...

Q: Fuel promblem

You may have excessive dirt inside the tank that has clogged the fuel filter to the point that the dirt has gotten into the injectors, causing the misfire. Remove the fuel filter and blow through it to see...

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...
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...
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.