Skip the auto shop - Our mechanics make house calls

Q: Engine misfiring in a 2002 Pontiac Montana

asked by on

I have an engine misfire and get Check Engine codes P0300, P0203, and P0204.

A: A misfire could be caused by number of prob...

A misfire could be caused by number of problems but since you are getting the p0204 and p0203 I believe that is is probably an injector that is causing the misfire. I would replace the injector for the number 3 and the number 4 cylinder and see if that fixes your problem. A mechanic with YourMechanic can assist you with that if you don’t feel comfortable.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Dash and headlights flash for about 1 minute after shut off

Hi there. It sounds like the lighting system has feedback through another circuit. This could be due to a short circuit, open circuit, missing/failed ground point, corroded ground point, corroded connector, loose connector, or relay block faults. With the age...

Q: Car has leak and water in engine

Hello and thanks for writing in. Unfortunately, what you are describing sounds like a blown head gasket. A blown head gasket may cause a number of different symptoms. A head gasket that fails between cylinders will generally cause a misfire...

Q: What Advantages Are There of Rebuilding an Engine Rather Than Replacing It?

When you are looking at the question of whether you should rebuild or replace a motor, you will first have to assume the original motor is rebuildable. If you do not know if your engine is rebuildable then the engine...

Related articles

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.