Skip the auto shop - Our mechanics make house calls

Q: My Dodge seems to be misfiring

asked by on

Have just recently done an engine swap on 2002 Dodge Dakota 5.9 liter V8 I have changed plugs wires throttle position sensor camshaft sensor s mass airflow sensors and other sensors that I can't even remember right now at the moment I'm so frustrated so put it where I want it idles really hard up down and it shakes and rattles and Rumbles is running really rich and figure it out any ideas like I said all sensors are new
My car has an automatic transmission.

Hi there:

This situation happens more often than most mechanics would like to admit. However, the first thing I’d check is to see if the ECU was reset or calibrated to this new engine. Even if all the engine parts are identical, it’s always recommended to have the ECU reset before you start the new engine. Other common issues that will cause the misfire may include faulty ignition coil, a spark plug wire or since you’re experiencing a rich situation, a problem with the idle control valve or mass air flow sensor. If you need some assistance, feel free to contact one of our local mechanics to complete an engine is misfiring inspection.

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: Radiator fans come on but very briefly. 5 seconds at the most. The car overheats when I get off the highway.

The first thing is to make sure the cooling system is indeed full. When the heat turns cold, this could be an electric problem or there could be an air bubble in the cooling system. A low cooling system can...

Q: Removal of Plastic housing, Rear of club cab under seat

If you do not see screws to hold it down, then the seat will have to be removed and it will have plastic tabs with metal clips to hold it down. Just start in one corner and get a trim...

Q: Water Damage Radio

It would be helpful to know how the radio got water damaged, and if the rest of the dashboard was wet.There are other modules and components that are below the radio that could have been damaged.The radio make and model...

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...
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.