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 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: hi do i need to remove the upper intake manifold to change the coil pack on a 2007 montana sv6. one bolt seems to be under the man

The process to remove the coil does not call for the upper intake to be removed. It calls for the upper trim cover only to be removed. You may have to use a small swivel socket with a short extension...

Q: Car won't always start right away, after fueling up.

The purge valve on the engine is not supposed to flow fuel tank vapors from the carbon canister when the vehicle is off or at idle. When refueling the vehicle a lot of fumes are generated in the tank and...

Q: Engine squeaks when car is on.

The noise you may be hearing is the belts need to be adjusted or one of the pulleys are going bad. The only way to tell would be to listen to it. If you are going on a long trip...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...