Question about 2004 Isuzu Rodeo
Multiple Misfiring basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly. This is P0300 diagnostic code and indicates a random or multiple misfire; when you using one scanner reader, 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 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 EGR valve / passages
* Faulty camshaft position sensor
* Defective computer
* 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.
Check it and keep us updated.
Posted on May 26, 2011
This sounds like aftermarket spark plugs. Get yourself some NGK or Nippon Denso spark plugs and install them. Multiple misfires have to have something in common according to the computer and knock sensor. The only othe ritem that may cause this is contamintaed fuel. Has anybody taken a fuel sample. I'll bet that they will find water. Do not replace any thing else until a fuel sample can be taken. I find the use of a glass tube from a cigar or an old jar is the best to see. When you confirm contamination, replace the plugs and then drain the tank and replace with fresh fuel.
Posted on May 18, 2011
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Posted on Jan 02, 2017
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