Q: Can't get power at all. Misfire with code P0303.

asked by on January 16, 2017

Can't get power at all.. misfire p0303

My car has 65000 miles.
My car has an automatic transmission.

Engine is misfiring Inspection $79.99 - $89.99 Get a Quote

Hi there. The code P0303 means that cylinder number 3 has a misfire. There are three ways that the cylinder number 3 can be misfiring.

  • Spark plug is fouled out and not creating a strong enough spark to ignite the fuel
  • Fuel injector is clogged or has stopped working and not spraying any fuel
  • A burned valve, burned piston rings, or a hole in the piston that will cause the cylinder temperature to drop causing the fuel to not burn

Check the spark plug on the cylinder number 3 and see if there is a suffucient amount of spark. If the spark is there and is strong, then check the fuel injector and see if it’s spraying or not by unplugging the injector as the engine is running. If the engine try’s to stumble more, then the fuel injector is working. If there is no change, then the fuel injector is not working. If the spark plug and fuel injector is working, then there could be internal damaged to the cylinder. If you need further assistance with your engine misfiring, then seek out a professional, such as one from Your Mechanic, to help you.

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

What others are asking

My engine light is on, has increased emissions and reduced power, and car also shakes

Hello, thanks for writing in. The coolant temperature code can be due to low coolant or a failure in the thermostat. Most of the time this is a thermostat issue. As for the misfire problem, it is common for one...

Windshield wipers less effective when I'm driving fast

Hello. It is possible that air is getting under the windshield wipers, making them ineffective. Although it is more likely that the windshield wiper arms are getting bent and/or have worn out. Sometimes the windshield wipers can be bent or...

Hello, I have a 2010 Dodge Avenger Sxt Automatic 2.4l. the lightning bolt light is flashing in morning when turn heat on immediate

You will need to have computer scanned to see if codes are stored and have them diagnosed. The throttle body light comes on and flashes when the system detects a problem and goes into failure mode and should store a...

Check Battery light still on

Hi. The system is not charging because of the symptoms mentioned. A new alternator does not always mean it is a good one. The wiring will need to be checked. There is a 150 amp fuse you can check. There...

I hear a small noise every time I accelerate the gas

With the information you have provided, it sounds like you may be hearing the air as it is being drawn into the intake manifold. There are other possible causes, but this is the first thing that comes to mind when...

If you have to add oil all the time and there is no oil puddle left on the ground but the dealer suggests an oil pan gasket leak h

Hi there: On any engine that has issues with loose or damaged internal components, such as valve guides or piston rings, going through oil frequently is commonplace. If the oil pan gasket is leaking, it may be burning on exhaust...

I replaced 2 spark plugs in cylinder 5 to fix a misfire.

Leaking valve covers on this engine allow oil down into the spark plug recesses as you note. Besides shorting the plug, the oil degrades the boot portion of the coil which plugs onto the spark plug, creating other opportunities for...

Replaced downstream o2 sensor, check engine light related to that sensor. What do i do?

Claimed by John Hege

My engine rattles while idle and losing power while driving

This is a common sign of a failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the...

Related articles

A Buyer’s Guide to the 2012 Volkswagen Golf
The The 2012 Volkswagen Golf offers comfort and an elegant design for a variety of transportation needs. The Golf is a solid vehicle, good size, and great value, especially when it comes to comparing prices of similar vehicles. Key Features...
A Buyer's Guide to the 2012 Volkswagen Tiguan
If If you’re in the market for a concept SUV, you’ve probably noticed a few more options sprouting up every year. However, the 2012 Volkswagen Tiguan should still make the decision a relatively easy one. Key Features Being compact means...
A Buyer’s Guide to the 2012 Volkswagen Touareg TDI
The The 2012 Volkswagen Touareg TDI brings diesel to the family in a big way. This crossover SUV delivers seamless performance in a vehicle that obviously designed for the open road rather than any trails or other types of off-road...