Q: Q: Engine misfiring

asked by on

The engine is misfiring and giving me code P0303. The shop is saying to replace the spark plugs, spark plug wires, ignition coil, and intake manifold.

It is possible that the spark plugs and wires, or even the ignition coil, may require replacement, but the intake manifold is a highly unlikely cause of this trouble code. Any issues related to misfires are usually found in the ignition system, which can be diagnosed through an engine misfire inspection I would recommend having the spark plug on cylinder three pulled out by a mechanic to check its condition, as well as checking the wire that powers it. If these two seem to be faulty, have them replaced as well as all other plugs and wires; this is a periodic maintenance service that is necessary anyway. It is also a good idea to have the ignition coil tested to ensure it is functioning correctly. If not, have the ignition coil replaced.

Was this answer helpful?
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. Q: Engine misfiring

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: Water coming out of the exhaust pipe

Hello. Water coming out of the exhaust pipe is usually an indication of a blown head gasket. The head gasket is located between the engine block and the cylinder head. Antifreeze runs over the head gasket and when working properly....

Q: My car starts then stallsafter a few seconds and won't start again

Hello. The steps you have taken at this point are all appropriate, and help to eliminate a lot of the electrical components that can cause stalling. You may be looking at a mechanical issue instead of an electrical one. You...

Q: Multiple problems with the car I just purchased

Hi there. I am so sorry that this has happened to you. The Check Engine Light bulb needs to be replaced so that you know when the system sees a problem; you didn't know that you would fail the emissions...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...