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So one side of the v-6 is out of sync. I'd give it to a mechanic who can run a diagnostic with a scanning tool to determine if the electrical values are within factory specs. You may have weak Upper O2 sensors or a bad fuel regulator but why guess when it can be diagnosed. Good luck.
Not much.
Code 300 is for a random miss. The engine computer has detected more than one cylinder that is not producing power, but no one cylinder is constant.
Until you get a code like 301 or 303 its a guessing game. 301-306 would tell you which cylinder is being the problem.
The cause could be fuel or spark.
P0300 Diagnostic Code - Random Misfire Technical Description Random/Multiple Cylinder Misfire Detected What does that mean? Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. Symptoms Symptoms may include: the engine may be harder to start the engine may stumble / stumble, and/or hesitate other symptoms may also be present Causes A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages Faulty camshaft position sensor Defective computer Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. 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 (a.k.a. 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. It is helpful to have access to a factory service manual and an advanced scan tool to properly diagnose a random misfire DTC. P0300 Diagnostics Video Here is a helpful video that may assist you in learning more, diagnosing, and repairing your P0300 DTC. This video is intended for auto repair professionals but could be helpful to DIYers. It shows use of an advanced OBD-II scan tool during diagnostic steps:
A P0300 code is set when cylinder number three is misfiring. On this case the check engine light will probably be flashing when you are driving the vehicle. I would suspect that the wire to that cylinder is not on properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit
is a number other than zero, it corresponds to the cylinder number that is misfiring.you can use this tool clear the DTC.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit
is a number other than zero, it corresponds to the cylinder number that is misfiring. try to use this tool clear the p0300.
Diagnostic Test Code (DTC) P0300 has a generic description of "Random Cylinder Misfire". To put it simply, there is more than one cylinder in your engine that has been misfiring. What needs to be done is to (A) determine WHICH cylinders are actually misfiring. This can be done by using a scan tool to view the misfire data and the freeze frame data that is stored in the computer and (B) Perform proper diagnostic procedures to determine the actual CAUSE of the misfire(s).
Misfires can be caused by many things. It could be as simple and painless as worn-out spark plugs that need to be replaced or it could be much more involved and expensive to repair like burned valves or a blown head gasket.
If the check engine light stayed off then that means that those errors are not present at this time. It is not un common to have intermittent faults but I would not preced any further until the light comes back on. Then re-scan the code see which are to begin diagnostics.
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