Code 300 is for a random miss, which could also be a fuel injector problem or fuel related such as a filter or O2 sensor.
SOURCE: code P1320 what do it mean
consider your fuel injecter, if the fuel injecter isn't good the needle that allows the spray of gas into the cylinder will stick and will not allow the proper amount of gas fire into the cylinder. that is likely the problem if you have already changed the spark plugs, knock sensor, etc... another thing to likely look at is your MAF sensor. though im pretty sure it might be your injector
SOURCE: i have a 2000 Nissian
Believe it or not in about 80 percent of multiple misfire codes it has nothing to do with the plugs, cap and rotor. In my experience I have found that most of them seem to be fuel related problems such as a bad injector. You didn't mention what engine size you had so I just went to the first engine which was the 2.4 liter but the basic procedures are the same. Below is a step by step testing procedures for your code right from the factory service manual. I didn't put the steps dealing with the plugs and such since those have been replaced. In any case those steps begin all the way at number 9 so there are many other causes to check before even going to the plugs and such. If you need the steps for a 3.3 or the rest of the steps for the 2.4 you can email me at [email protected] with all your information and I will be happy to email you the information. There are further steps to check such as the O2 sensors and the mass airflow sensors but since you were not getting codes for those I didn't put the tests in there but it is possible that this could cause the misfire codes. I hope this helps and good luck.
SOURCE: Chevy prizm with DTC P0300 CODE . What could cause this
They are dual earth for a larger spark. This is no problem
SOURCE: obd code p0300 1997 nissan pathfinder
If only code p0300 exists, one bank fuel trim is lean, and the other bank fuel trim is rich, it is wrong camshafts timing. If you mismatch one tooth on timing belt, the result is engine minor misfire and code p0300 is set.
Please remove the timing belt and match up the line marks on the timing belt with the marks on the camshaft and crankshaft pulley. Please pay attention to the arrow on the timing belt point to the front
A code P0300 may mean that one or more of the following has happened:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
A code P0300 may mean that one or more of the following has happened:
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders ( spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open
A code P0300 may mean that one or more of the following has happened:
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