WHAT engine code error is shown using a OBD II scan tool?
Engine cylinder 4 misfireWHAT engine code error is shown using a OBD II scan tool?
Hey Rick I appreciate your response but my Nitro's issue is not common. I have a unique situation with the fact that this vehicle has misfired for quite some time. It wasn't a hard failure until recently so it is easier to diagnose however since I have narrowed it down to a computer now the issue is finding a replacement unit. I have reached out to MAK which sells remanufactured computers. They shipped me one but that reman is defective because the truck ran worse even after soft and hard resets of the computer. I am working with their lead engineer to figure things out but thus far no progress. I will keep this forum up to date because if I can help someone else who has a similar issue I am good with that accomplishment.I guess you must have a PO304-code error that is common with the Nitro on both engines of the Nitro.
Dodge Nitro: Engine Problems / Code Errors
I guess you have checked out our above Thread, if not it should be helpful.
You may have already cheeked out the many causes and eliminated most but everything from cam ware issues to head valve seat are also sometime the reason for this code. Hopefully not! Good Luck! Let us know what you finally find is the issue to help others.
Fixing P0304 should be considered a high priority. Unlike a lot of the OBDII codes, this code has to do directly with engine combustion. It also can cost money to ignore it, since driving with a misfire can damage the vehicle’s catalytic converter. The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Nitro has P0304 as well.
P0304 Trouble Code Diagnosis- Dodge Nitro
There are quite a few things that can cause the P0304 trouble code to trigger the Dodge Nitro. Here are the most common problems that will throw the code. They are presented somewhat in order from most to least likely to be causing the code:
Bad Spark Plugs– Spark plugs are one of the most common causes of P0304. Take a look at the electrodes and see if they are in good shape. Most vehicles now come with iridium plugs that need changed very infrequently. That being said, the plugs are a great place to start. Here’s a great video on how to see if a spark plug is bad.
Spark Plug Wires– On most modern engines, the plug wires are not nearly as long as they once were, but they can still go bad. Here’s how to tell if your plug wires are bad (video).
Coil Packs– Coil packs rarely go bad, but when they do, they can certainly cause P0304 in your Dodge Nitro. Replacing a set can be very expensive. Here’s how to test them.
Bad Fuel Injector– If you have a fuel injector that has gone bad, it won’t be able to properly atomize the fuel and you’ll get the P0304. Here’s a good video on how to diagnose an injector, it can be a little tricky. This is definitely not the place to start.
Vacuum leak– If your Nitro has a vacuum leak, it can be very difficult for it to get the right air/fuel mixture. This will cause the cylinders to misfire and it’ll throw the P0304 if the leak is around that specific cylinder on the intake manifold. It’s easy (and kind of fun) to chase one down. Popular Mechanics: How to find a vacuum leak.
Cam or Crank Sensors– This one is very unlikely, but it does happen. If the ECU is not getting the right signal from these sensors, the vehicles timing is not going to sync up and it’ll misfire.
Low Compression– If you have a leaking head gasket, bent valve, cracked head, etc.. that would cause compression to not be as high as it should, you’re going to get P0304. You should also feel the vehicle is down on power as well.
So I tested the system with the oxygen sensors, and no change in performance. I am meeting with a national automotive technical trainer this afternoon to do so further testing. I plan to narrow down this issue; however, it is puzzling and bizarre simultaneously. I am one not to go through components to keep one's sanity, but I am close. In my lifetime, I have troubleshot many vehicles and been able to diagnose them without throwing components. Further, my automotive technical skills are dated after several years (approx. 12 years) of not tinkering with fuel-injected systems. It will be interesting if I can pinpoint the issue and one for the books. Stay tuned for more to come.Thanks for the update again and GOOD LUCK!!!